Information can be communicated to or from an electronic device in accordance with a plurality of protocols to provide a plurality of services for the user. The apparatus can operate with any conventional modulation (analog or digital) and in accordance with at least one of the plurality of protocols. If the user is a person, the services can include providing audio or tone signals. If the user is a device, the services can include providing audio, tone, or data signals. The electronic device is a receiver, a transmitter, or transceiver.
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0. 66. An apparatus for using electromagnetic radiation to communicate with a user in accordance with anyone or more of a plurality of predetermined communications services, the apparatus comprising:
a service circuit to establish the one or more predetermined communications services and generate a service signal representative of the one or more predetermined communications services established; and
a radio frequency circuit to receive the service signal and respond to the service signal by configuring itself to respond to radio frequency signals in compliance with the one or more predetermined communications services.
0. 65. An apparatus for using electromagnetic radiation to communicate with a user in accordance with anyone or more of a plurality of predetermined communications protocols, the apparatus comprising:
a protocol circuit to establish the one or more predetermined communications protocols and generate a protocol signal representative of the one or more predetermined communications protocols established; and
a radio frequency circuit to receive the protocol signal and respond to the protocol signal by configuring itself to respond to radio frequency signals in compliance with the one or more predetermined communications protocols.
0. 68. A method for using electromagnetic radiation to communicate with a user in accordance with anyone or more of a plurality of predetermined communications services, the method comprising:
providing a radio frequency circuit;
establishing the one or more predetermined communications services;
generating a service signal representative of the one or more predetermined communications services established;
receiving the service signal; and
responding to the service signal by configuring the radio frequency circuit to respond to radio frequency signals in compliance with the one or more predetermined communications services.
0. 67. A method for using electromagnetic radiation to communicate with a user in accordance with anyone or more of a plurality of predetermined communications protocols, the method comprising:
providing a radio frequency circuit;
establishing the one or more predetermined communications protocols;
generating a protocol signal representative of the one or more predetermined
communications protocols established;
receiving the protocol signal; and
responding to the protocol signal by configuring the radio frequency circuit to respond to radio frequency signals in compliance with the one or more predetermined communications protocols.
1. Apparatus An apparatus for using electromagnetic radiation to communicate with a user in accordance with any one or more of a plurality of predetermined communications protocols, and in accordance with any one or more of a plurality of predetermined communications services, the apparatus comprising:
a protocol circuit to establish the one or more predetermined communications protocols and generate a protocol signal representative of the one or more predetermined communications protocols established;
a service circuit to establish the one or more predetermined communications services and generate a service signal representative of the one or more predetermined communications services established; and
a radio frequency circuit to receive the protocol signal and the service signal and respond to the protocol signal and the service signal by configuring itself to respond to radio frequency signals in compliance with the one or more predetermined communications protocols and the one or more predetermined communications services.
4. A method for using electromagnetic radiation to communicate with a user in accordance with any one or more of a plurality of predetermined communications protocols, and in accordance with any one or more of a plurality of predetermined communications services, the method comprising the steps of:
a) providing a radio frequency circuit;
b) establishing the one or more predetermined communications protocols;
c) generating a protocol signal representative of the one or more predetermined communications protocols established;
d) establishing the one or more predetermined communications services;
e) generating a service signal representative of the one or more predetermined communications services established;
f) receiving the protocol signal and the service signal; and
g) responding to the protocol signal and the service signal by configuring the radio frequency circuit to respond to radio frequency signals in compliance with the one or more predetermined communications protocols and the one or more predetermined communications services.
7. Apparatus An apparatus for using electromagnetic radiation to communicate with a user in accordance with any one or more of a plurality of predetermined communications protocols, and in accordance with any one or more of a plurality of predetermined communications services, the apparatus comprising:
radio frequency circuit means;
protocol establishment means for establishing the one or more predetermined communications protocols;
protocol signal means for generating a protocol signal representative of the one or more predetermined communications protocols established;
service establishment means for establishing the one or more predetermined communications services;
service signal means for generating a service signal representative of the one or more predetermined communications services established;
receiver means for receiving the protocol signal and the service signal; and
electromagnetic radiation response means for responding to the protocol signal and the service signal by configuring the radio frequency circuit means to respond to radio frequency signals in compliance with the one or more predetermined communications protocols and the one or more predetermined communications services.
2. The apparatus of
3. The apparatus of
5. The method of
g) h) producing signals for the user in compliance with at least one of the one or more predetermined communications protocols and with at least one of the one or more predetermined communications services.
6. The method of
g) h) transmitting the electromagnetic radiation in compliance with at least one of the one or more predetermined communications protocols and with at least one of the one or more predetermined communications services.
8. The apparatus of
9. The method apparatus of
0. 10. The apparatus of claim 1, wherein the one or more predetermined communications services comprises a voice service.
0. 11. The apparatus of claim 1, the one or more predetermined communications services comprises PCS.
0. 12. The apparatus of claim 1, wherein the one or more predetermined communications services comprises PCS 1900.
0. 13. The apparatus of claim 1 wherein the one or more predetermined communications services comprises a data service.
0. 14. The apparatus of claim 13, wherein the at least one or more predetermined communications protocols includes the X.25 protocol.
0. 15. The apparatus of claim 13, wherein the at least one or more predetermined communications protocols includes the HDLC protocol.
0. 16. The apparatus of claim 13, wherein the one or more predetermined communications services comprises timeshare RAM.
0. 17. The apparatus of claim 1, wherein the one or more predetermined communications services comprises a simultaneous voice and data service.
0. 18. The apparatus of claim 17, wherein the simultaneous voice and data service is SMS and voice.
0. 19. The apparatus of claim 1, wherein the one or more predetermined communications services comprises a paging service.
0. 20. The apparatus of claim 19, wherein the paging service is provided simultaneously with other communication services.
0. 21. The apparatus of claim 1, wherein the one or more predetermined communications services comprises at least two communication services.
0. 22. The apparatus of claim 21, wherein the one or more predetermined communications services comprises a data service and a voice service.
0. 23. The apparatus of claim 21, wherein the at least two communications services operate on different respective frequencies.
0. 24. The apparatus of claim 21, wherein the at least two communications services use different forms of signal modulation.
0. 25. The apparatus of claim 21, wherein the at least two communications services use different communication protocols.
0. 26. The apparatus of claim 1, wherein the one or more predetermine communications services comprises at least three communications services.
0. 27. The apparatus of claim 26, wherein the at least three communications services comprise a paging service, a voice service, and a data service.
0. 28. The apparatus of claim 1, wherein the one or more predetermined communications service comprises a wideband service.
0. 29. The apparatus of claim 1, further comprising:
an encryption unit configured to encrypt information sent using the one or more predetermined communications service; and
a decryption unit configured to decrypt information received using the one or more predetermined communications service.
0. 30. The apparatus of claim 1, wherein the radio frequency circuit further comprises an FPGA.
0. 31. The apparatus of claim 1, wherein, the radio frequency signals are in the range of 824-849 MHz.
0. 32. The apparatus of claim 1, wherein, the radio frequency signals are in the range of 869-894 MHz.
0. 33. The apparatus of claim 1, wherein the protocol circuit receives information regarding the one or more predetermined communications protocols using a paging service.
0. 34. The apparatus of claim 33, wherein the paging service operates according to the POCSAG protocol.
0. 35. The apparatus of claim 1, wherein the protocol information is received by the apparatus at around 512 bits per second.
0. 36. The apparatus of claim 1, wherein the protocol information is received by the apparatus at around 1200 bits per second.
0. 37. The apparatus of claim 1, wherein the protocol information is received by the apparatus at around 2400 bits per second.
0. 38. The apparatus of claim 1, wherein the protocol information is received by the apparatus at less than or equal to 512 bits per second.
0. 39. The apparatus of claim 1, wherein the protocol information is received by the apparatus at less than or equal to 1200 bits per second.
0. 40. The apparatus of claim 1, wherein the protocol information is received by the apparatus at less than or equal to 2400 bits per second.
0. 41. The apparatus of claim 3, wherein the transmission power of the radio frequency transmitter is less than or equal to 0.6 watts.
0. 42. The method of claim 4, wherein the one or more predetermined communications services comprises a voice service.
0. 43. The method of claim 4, wherein the one or more predetermined communications services comprises PCS.
0. 44. The method of claim 4, wherein the one or more predetermined communications services comprises PCS 1900.
0. 45. The method of claim 4, wherein the one or more predetermined communications services comprises a data service.
0. 46. The method of claim 45, wherein the more predetermined communications protocols includes the X.25 protocol.
0. 47. The method of claim 45, wherein the one or more predetermined communications protocols includes the HDLC protocol.
0. 48. The apparatus of claim 45, wherein the more predetermined communications services comprises timeshare RAM.
0. 49. The method of claim 4, wherein the one or more predetermined communications services comprises a simultaneous voice and data service.
0. 50. The method of claim 49, wherein the data portion of the simultaneous voice and data service is SMS.
0. 51. The method of claim 4, where in the one or more predetermined communications services comprises a paging service.
0. 52. The method of claim 51, wherein the paging service is provided simultaneously with other communication services.
0. 53. The method of claim 4, wherein the one or more predetermined communications services comprises at least two communication services.
0. 54. The method of claim 53, wherein the at least two communications services comprises a data service and a voice service.
0. 55. The method of claim 53, wherein the at least two communications services operates on different frequencies.
0. 56. The method of claim 53, wherein the at least two communications services use different forms of signal modulation.
0. 57. The method of claim 53, wherein the at least two communications services use different communication protocols.
0. 58. The method of claim 4, wherein the one or more predetermined communications services comprises at least three communications services.
0. 59. The method of claim 58, wherein the at least three communications services comprise a paging service, a voice service, and a data service.
0. 60. The method of claim 4, wherein the one or more predetermined communications services comprises a wideband service.
0. 61. The method of claim 4, further comprising:
encrypting information to be sent using the one or more predetermined communications services: and
decrypting information received using the one or more predetermined communications service.
0. 62. The method of claim 4, wherein the radio frequency circuit is configured using an FPGA.
0. 63. The method of claim 4, further comprising:
receiving protocol information via a paging service; and
using the protocol information as part of establishing the one or more predetermined communications protocols.
0. 64. The method of claim 4, further comprising:
receiving service information via a paging service; and
using the service information as part of establishing the one or more predetermined communications services.
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This application claims the benefit of the US Provisional Application No. 60/022,089, filed Jun. 10, 1996.
The present invention relates to methods and apparatus for communicating information, and more particularly, to method and apparatus for adapting to changing communications services.
Personal communications is on the brink of an unprecedented expansion of its capabilities. With the advent of advanced personal communications services, such as cellular telephone and low earth orbit (LEO) satellite services, this expansion of capabilities also benefits mobile users. Not only does the expansion of capabilities benefit voice communications, but it also benefits data communications, such as might be used with portable computers and other personal data communicators.
A major difficulty with the expansion of services is that a wide variety of different voice and data communications protocols have been proposed. It can be expected that this variety will increase, both world-wide and within a local area. For example, each communications service has its own technical, geographic and feature sets. Technical parameters include frequency(ies), modulation and protocol used, among others. Geographic parameters are dictated by the particular locale. Feature sets describe whether the service is voice, paging, data, or some combination of these.
As a consequence, a given communications device will become less useful as its user attempts to use it in areas that use incompatible services. For example, as people who rely on mobile communications move through a day, they can move in and out of different coverage areas and their communications needs will change constantly. Further, even within a local area, a given communications device will gradually become less useful as its built-in capabilities are rendered out-of-date by newer services.
It is clearly undesirable for the individual to have to carry a different communication device for each communication service. Also, few individuals really want to know the details and peculiarities of each of the available communication service. Most individuals would much rather have seamless service that is simple, convenient and cost-effective for the user.
Therefore, it is advantageous to have a single personal communications device that will reconfigure itself to be compatible with whatever communications service is desired or needed. This is difficult with today's conventional technology.
In accordance with a first aspect, the invention is an apparatus for using electromagnetic radiation to communicate with a user. The communication is in accordance with any one or more of a plurality of predetermined communications protocols, and in accordance with any one or more of a plurality of predetermined communications services.
The apparatus includes a protocol circuit, a service circuit, and a radio frequency circuit. The protocol circuit establishes the one or more predetermined communications protocols. It also generates a protocol signal representative of the one or more predetermined communications protocols established. The service circuit establishes the one or more predetermined communications services and generates a service signal representative of the one or more predetermined communications services established. The radio frequency circuit receives the protocol signal and the service signal and respond to the protocol signal and the service signal. The radio frequency circuit configures itself to respond to radio frequency signals in compliance with the one or more predetermined communications protocols and the one or more predetermined communications services.
In accordance with another aspect, the invention is a method for using electromagnetic radiation to communicate with a user in accordance with any one or more of a plurality of predetermined communications protocols, and in accordance with any one or more of a plurality of predetermined communications services. The method includes the steps of a) providing a radio frequency circuit, b) establishing the one or more predetermined communications protocols, and c) generating a protocol signal representative of the one or more predetermined communications protocols established. The method further includes the steps of d) establishing the one or more predetermined communications services, e) generating a service signal representative of the one or more predetermined communications services established. In addition, the method includes the steps of f) receiving the protocol signal and the service signal, and g) responding to the protocol signal and the service signal by configuring the radio frequency circuit to respond to radio frequency signals in compliance with the one or more predetermined communications protocols and the one or more predetermined communications services.
In accordance with a further aspect, the invention is an apparatus for using electromagnetic radiation to communicate with a user in accordance with any one or more of a plurality of predetermined communications protocols, and in accordance with any one or more of a plurality of predetermined communications services. The apparatus includes radio frequency circuit means, protocol establishment means, protocol signal means, service establishment means, service signal means, receiver means, and electromagnetic radiation response means. The protocol establishment means is for establishing the one or more predetermined communications protocols, and the protocol signal means is for generating a protocol signal representative of the one or more predetermined communications protocols established. The service establishment means is for establishing the one or more predetermined communications services, and the service signal means is for generating a service signal representative of the one or more predetermined communications services established. The receiver means is for receiving the protocol signal and the service signal. Finally, the electromagnetic radiation response means is for responding to the protocol signal and the service signal by configuring the radio frequency circuit means to respond to radio frequency signals in compliance with the one or more predetermined communications protocols and the one or more predetermined communications services.
In accordance with another aspect, the invention is a method for using electromagnetic radiation to communicate with a user in accordance with any one or more of a plurality of predetermined communications protocols, and in accordance with any one or more of a plurality of predetermined communications services. As shown in
In accordance with a further aspect of the invention shown in
As shown in
On transmit, an audio in signal is received by an input bandpass filter 128. The filtered signal from the bandpass filter 128 then passes to a compressor circuit 130. The compressed signal from the compressor circuit 130 next passes to a pre-emphasis filter 132. Another source of audio signals is a dual-tone multifrequency (DTMF) generator 134, generally operated by a user activating a keypad (not shown). The audio signal to be transmitted is selected by a switch 136, which then passes to a deviation limiter circuit 138. Thereafter, the deviation limited signal produced by the deviation limiter circuit 138 is transmitted by a post deviation-limiter filter 140. Yet another source of audio signals is a signal tone generator 142. The switch 144 selects either the signal produced by the post deviation-limiter filter 140 or the signaling tone generator 142. The selected signal passes to a mixer 146 where it is mixed with a second output signal of the PLL 124. Another source of an output signal is the microcontroller (not shown) which produces a data signal that is received by a wideband transmit data processing circuit 148. A switch 150 selects either the output of the mixer 146 or the output of the wideband transmit data processing circuit 148. The selected signal to be transmitted is then transmitted to a conventional transmit modulator (not shown).
From another view, the functional distribution diagram of a first preferred embodiment 100 of the invention is shown in
Regardless of which alternative is followed, the output signal of the A/D circuit 204 or the digital demodulation circuit 210 is passed simultaneously to three series combinations of functional elements. In one of the combinations, a receiver bandpass filter 212 receives the signal and passes its output to a deemphasis filter 214. The deemphasis filter 214 then passes its output signal to an expander circuit 216 (for example, a 2:1 expander) and the output of the expander circuit 216 then passes to a digital-to-analog (D/A) circuit 218 which also receives a clock signal 220 from a clock (not shown). The digital-to-analog (D/A) circuit 218 operates at an audio frequency. The output of the digital-to-analog (D/A) circuit 218 is then transmitted to a conventional speaker (not shown) or conventional modem (not shown) where the audio frequency information is used.
Along another combination of functional elements, the bandpass filter 114 filters the output signal and transmits the filtered output to the phase-lock loop 124. The output of the phase-lock loop 124 is then sent to a gated summation amplifier (not shown) for use in frequency generation. The output of the phase-lock loop 124 is also sent to a microcontroller (not shown) for further processing.
Along another possible combination of functional elements, a zero-crossing detector 222 processes the output signal and produces a timing signal that is used by a receive wideband timing recovery circuit 224. The receive wideband timing recovery circuit 224 produces an output signal that is then processed by a receive wideband data processing circuit 226 that produces data that can be used by the microcontroller for control purposes.
For transmit purposes, an audio input signal, received from a microphone or modem, is received by an anti-alias filter 228. The output of the anti-alias filter 228 is then passed to an audio A/D circuit 230, where it is digitized. The digital output signal from the audio A/D circuit 230 is next filtered by the input bandpass filter 128. The filtered signal from the bandpass filter 128 then passes to a compressor circuit 130. The compressed signal from the compressor circuit 130 next passes to a pre-emphasis filter 132. The output of the pre-emphasis filter 132 then passes to a deviation limiter circuit 138 and then to a deviation limiter circuit 138. The deviation limited signal produced by the deviation limiter circuit 138 is transmitted by a post deviation-limiter filter 140 to a gated sum amplifier 232.
Another input to the gated sum amplifier 232 is derived by processing a signal from the microcontroller (not shown) to produce an input to a dual-tone multifrequency (DTMF) generator 134. Still another input to the gated sum amplifier 232 is derived by processing a signal from the microcontroller to produce an input to a signal tone generator 142. Yet another input to the gated sum amplifier 232 is derived by processing a signal from the microcontroller through a wideband transmit data processing circuit 148. The output of the wideband transmit data processing circuit 148 then passes to a wideband transmit filter 234.
Regardless of the source of its input signal, the output of the gated sum amplifier 232 passes to a modulation D/A converter 234 which, in turn, passes its output signal to an FM modulator. As another possible use of the embodiment 100, the output of the gated sum amplifier 232 passes to a final modulation device 236 and then to a D/A converter 236. The output of the D/A converter 236 can then be transmitted to the intermediate frequency stage (not shown) of a transmitter.
The apparatus 300 of the second preferred embodiment of the invention includes an antenna 302 for receiving electromagnetic signals that are in the appropriate frequency range (s). The signal from the antenna 302 is then processed by an FM receiver 304 whose output is then demodulated by a demodulation circuit 306. The output of the demodulation circuit 306 is processed by a digital filter 308, and the output of the digital filter 308 is then decoded by a decode circuit 310. The decode circuit 310 then produces a control signal that it transmits to a controller 312. The controller 312 processes the control signal and presents appropriate control information to a human interface 314 where it can be used by a human user.
The output of the direct conversion IF/FM demodulator circuit 408 is raw data, which is processed by a digital filter 410 and then by a decoder circuit 412. The decoder circuit 412 communicates with a memory circuit 414 by means of a bi-directional line, allowing the decoder circuit 412 to store and retrieve digital data. The decoder circuit 412 also produces an output signal that can be used by a microcontroller or by user interface circuitry (not shown).
As shown in
As shown in
This output signal is sent to a second phase splitter circuit 612 which also produces a direct (I) output and a quadrature (Q) output. The two I output signals are mixed in a mixer 614 and the two Q output signals are mixed in a mixer 616. The outputs of the two mixers 614 and 616 respectively are sent to intermediate frequency amplifiers 618 and 620. The outputs of these two intermediate frequency amplifiers are sent to respective active low-pass filters 622 and 624, after which their outputs are limited in limiters 626 and 628. The outputs of the limiters 626 and 628 are mixed in a mixer 630 to produce raw data output.
In
As shown in
On transmit, the embodiment 900 receives data input in a packet assembler circuit 920. After assembly, the packets are transmitted to a channel encoder 922 and then bit-interleaved by a circuit 924. The bit-interleaved signals are then scrambled in a scrambler 926, modulated in a GMSK modulator 928 and then sent to a radio frequency transmitter 930 for transmission through the antenna 932.
In the functional view of
As shown in
As shown in
This fourth preferred embodiment of the invention is particularly useful with an apparatus that uses GMSK modulation (bandwidth-time product of 0.3) in a receive frequency range of 1850-1910 MHz and a transmit frequency range of 1930-1990 MHz. The fourth preferred embodiment has channel spacing and IF bandwidth of 200 kHz, with speech coding of 13 kbps. The raw data rate for the fourth preferred embodiment is 270.833 kbps and features a TDMA transmission format (8 slots). The time slot length is 577 μs and the time frame length is 4.615 μs. The receiver portion of the fourth preferred embodiment of the invention has a sensitivity of −110 dBm. The transmit power for the third preferred embodiment is 0.6 W. The data support rate is 9.6 kbps.
As shown in
The receiver 904 sends its output to a demodulator and equalizer 1306. The demodulator and equalizer 1306 is part of a feedback loop including the circuit 1308, which provides automatic gain control (AGC), automatic frequency control (AFC), timing and synchronization signals to control the demodulator and equalizer 1306. The demodulator and equalizer 1306 also produces a digital scrambled signal that is sent to a demultiplexor circuit 1310.
The output of the demultiplexor circuit 1310 is next sent to a decryption circuit 1312. The output of the decryption circuit 1310 is next transmitted to a bit interleaving circuit 1314 to process the digital signal. The processed signals produced by the bit interleaving circuit 1314 are sent to a channel decoding circuit 1316, and then to a D/A speech decoder circuit 1318, thereby producing the corresponding voice output of the signals originally received by the antenna 1302.
On transmit, the embodiment 1300 receives analog voice input in a A/D speech coder circuit 1320. After coding, the output signals are transmitted to a channel encoder 1322 and then bit-interleaved by a circuit 1324. The bit-interleaved signals are then encrypted in a encrypter 1326, multiplexed in a multiplex 1328, modulated in a GMSK modulator 1330 and then sent to a radio frequency transmitter 1332 for transmission through the antenna 1334.
In the functional view of
In the functional view of
The first version 1600 of the fourth preferred embodiment of the invention includes a transmit buffer 1602 which receives is digital signals from an encoder (not shown). The outputs of the transmit buffer 1602 are transmitted to two sets of low pass filters 1604 and 1606, respectively. The two sets of low pass filters 1604 and 1606 can take the form of 8 by 8 tap Gaussian low pass filters. The outputs of each of the two sets of low pass filters 1604 and 1606 are sent to a feed back loop that the outputs to transformed versions of the output to produce output signals. The output signals are produced after their phase is reduced to a 360 degree range, and the fedback signals are produced by transforming the phase information signals. The output signals represent phase shifts and are converted to their direct (real) and quadrature (imaginary) components by trigonometric functions. These components are based on a 1.024 MHz frequency. The direct and quadrature components are next transmitted to an output buffer 1608, whose outputs are sampled at 2.1664 MHz to produce digital signals that are converted by two D/A converters 1610 and 1612. The outputs of the two D/A converters 1610 and 1612 are then transmitted to a conventional I/Q modulator.
As shown in
As shown in
Wherever possible, the controller code used with the various preferred embodiments is procured from of-the-shelf sources. Digital signal processing (DSP) functions are moved to a controller wherever possible. The advantages of the power management facilities of chips used are taken at every reasonable opportunity with the various embodiments. This power management can further take the form of modules to control power consumption in other parts of the system. The controller generally contains state machines, takes advantage of packetization whenever possible, and has a well-designed user interface, using the. skills known to those who are skilled in the art.
The field programmable gate arrays (FPGAs) use over-sampled analog-to-digital (A/D) and digital-to-analog (D/A) conversion using Σ-Δtechniques.
The system also has a direct memory access for transfer of data with the digital signal processing circuit of the system. In the preferred embodiments, a PCMCIA I/O device can be used.
Among the purposes for the analog hardware used in any of the preferred embodiments shown in the Figures, key factors are to provide high power efficiency (which will maximize battery life), to provide wide dynamic range, and to provide excellent adjacent channel and intermodulation rejection.
In the hardware, the DSP function can be provided by an ADI 2181 chip, operating at 33 MIPs (at the current maximum clock rate). If a vocoder is desired, it can operate at 3.3 MIPs. Modem functions are provided at not greater than 20 MIPs. The hardware embodiment can be designed to be easy to program, and has a good power consumption profile. The controller in the hardware can be a Hitachi H8 chip, which features low power consumption and an available code. The use of field programmable gate arrays (FPGAs) delivers the required functionality while also having a good power consumption profile. The hardware components are readily available from common commercial sources, including Xilinx 3042L-125 FPGAs, and an Analog Devices ADSP2181 DSO chip. Static RAM (SRAM) can have a capacity of 128 kbytes. Appropriate battery capacity is 1300 mAH.
The power consumption that results in transmission of 0.6W RF energy is 1.5 W for an analog system. For a digital system, the FPGAs consume 70 mW, the H8 microcontroller consumes 75 mW, and the DSP consumes 80 mW. In the standard voice mode, the battery life is 3 hours talk time and 18 hours standby time. In the pager wake-up mode, the battery will work for one month (with 8 short transactions/day, 5 days/week). Time to switch from one service to another is currently 31 ms.
While the foregoing is a detailed description of the preferred embodiment of the invention, there are many alternative embodiments of the invention that would occur to those skilled in the art and which are within the scope of the present invention.
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