Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
  • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
  • G01S19/13—Receivers
  • G01S19/35—Constructional details or hardware or software details of the signal processing chain
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
  • H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
  • H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
  • H04B1/0057—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using diplexing or multiplexing filters for selecting the desired band
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
  • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
  • H04B1/3805—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving with built-in auxiliary receivers
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
  • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
  • H04B1/40—Circuits

Definitions

• the present invention relates, generally, to communication systems and processes which use radio frequency (RF) transmitters and receivers (transceivers), and, in particular embodiments, to multi-service systems and processes with communication and Global Positioning System (GPS) capabilities that share functional blocks to minimize size, weight, complexity, power consumption, and cost.
• RF radio frequency
• GPS Global Positioning System
• GSM900 Global System for Mobile 900
• DCS 1800 is another digital cellular standard based on GSM technology, operating in the 1800 MHz frequency band and also currently used in Europe and Asia.
• the United States uses PCS 1900, a third digital cellular standard similar to DCS 1800, but operating in the 1900 MHz band.
• Multi-band cellular telephones capable of operating under all of these standards afford consumers widespread applicability and allow manufacturers to benefit from the cost-efficiency of a common design.
• multi-band cellular telephones present a number of design challenges.
• Conventional single-band transmitters typically require two separate frequencies, a fixed intermediate frequency (IF) for modulation and a tunable RF for upconversion.
• Conventional single-band receivers also typically require two separate frequencies, a tunable RF for downconversion and a fixed IF for demodulation.
• a single-band cellular telephone may require as many as four different frequency sources.
• Multi-band cellular telephones exacerbate the problem because the modulation, upconversion, downconversion, and demodulation processes for each band may require different frequencies.
• the different frequencies employed by each band may require different filters for the transmit and receive function of each band.
• This location identification capability is referred to in the industry and herein as E911 support.
• a cellular telephone capable of providing positioning information may benefit the business traveler who encounters a rental automobile equipped with a navigation system able to utilize such positioning information.
• Real estate agents, delivery services, and the like may be able to use positioning information to locate . houses or businesses.
• embodiments of the present invention provide a system and process for a shared functional block communication transceiver with E911 support to automatically supply the position of the transceiver when a 911 call is made from the transceiver.
• GPS Positioning System
• the communication system includes a transmitting unit having at least one transmit RF information signal output, and a receiving unit having at least one receive RF information signal input and a GPS RF information signal input.
• the transmitting unit includes a modulator for modulating a transmit IF with a transmit baseband information signal to generate a transmit IF information signal and an upconverter for upconverting the transmit IF information signal with a transmit RF to generate at least one transmit RF information signal.
• the receiving unit includes a receive downconverter for downconverting the at least one receive RF information signal with a receive RF to generate a receive IF information signal, a GPS downconverter for downconverting the GPS RF information signal with the receive RF to generate a GPS IF information signal, and a demodulator for demodulating the receive IF information signal and the GPS IF information signal with a receive IF to generate GPS and receive baseband signals.
• An antenna is coupled to the at least one transmit RF information signal output, the at least one receive RF information signal input, and the GPS RF information signal input for transmitting and receiving RF information signals.
• FIG. 1 is block diagram representation of a system environment according to an example embodiment of the present invention.
• FIG. 2 is a more detailed block diagram representation of the modulator in the system of FIG. 1.
• FIG. 3 is a block diagram representation of a shared functional block communication transceiver with GPS capability according to an embodiment of the present invention.
• FIG. 4 is a block diagram representation of a demodulator coupled to a full GPS processor for providing a complete GPS solution according to an embodiment of the present invention.
• FIG. 5 is a block diagram representation of a demodulator comprising a Coleman filter for providing E911 support according to an embodiment of the present invention.
• Multi-band cellular telephones with the flexibility to operate under multiple communications standards, afford consumers widespread applicability and allow manufacturers to benefit from the cost-efficiency of a common design.
• multi-band cellular telephones must mimmize size, weight, complexity, and power consumption.
• the portability of cellular telephones has led to additional requirements unrelated to the basic function of the cellular telephone that increase the design burden.
• the FCC has mandated that by the end of the year 2001, cellular service providers will be required to provide E911 support, which is the ability to automatically locate cellular telephones calling 911. Even in non- emergency situations, knowledge of the location of a cellular telephone is often helpful to assist the operator in navigation.
• GPS Global Positioning System
• GPS is a system that utilizes a constellation of satellites to identify the location of a recipient of GPS signals transmitted by the constellation of GPS satellites.
• Full GPS capability is not needed to provide E911 support.
• Cellular telephones with only E911 support use only a portion of the processing power of the full GPS solution, and transmit information to a server in a base station where calculations are performed.
• embodiments of the present invention also include cellular telephones with the full GPS solution that contain the basic GPS engine and perform most or all of the RF and baseband processing and acquisition within the cellular telephone. With full GPS capability, GPS may be invoked at any time to provide the longitudinal and latitudinal coordinates (or other geographic coordinate information) of the cellular telephone.
• Embodiments of the present invention therefore relate to shared functional block communication transceivers with GPS capability that share frequency sources, amplifiers, and mixers between bands and services. It should be noted, however, that transceivers according to embodiments of the present invention are not unique to cellular communications and may be employed in a variety of communications electronics, including wireless transmission systems as well as wired systems. Thus, embodiments of the invention described herein may involve various forms of communications systems. However, for purposes of simplifying the present disclosure, preferred embodiments of the present invention are described herein in relation to personal wireless communications systems, including, but not limited to digital mobile telephones, digital cordless telephones, digital pagers, combinations thereof, and the like. Such personal communications systems typically include one or more portable or remotely located receiver and/or transmitter units.
• CDMA-900 Code Division Multiple Access
• frequency bands are allocated such that a mobile subscriber unit will transmit signals over a transmit band of 824-849 MHz and receive signals over a receive band of 869-894 MHz.
• CDMA-900 capability discussed herein is capable of operating in analog Advanced Mobile Phone System (AMPS) mode when CDMA service is unavailable.
• AMPS Advanced Mobile Phone System
• CDMA- 1900 CDMA operating in the 1900 MHz band
• PCS PCS- 1900
• FIG. 1 A generalized representation of a communication system according to an embodiment of the present invention is shown in FIG. 1, wherein a transceiver 10 includes a transmitting unit 12 and a receiving unit 14, coupled for communication over a communication channel 42.
• Transmitting unit 12 includes a modulator 16 coupled to receive a transmit baseband information signal 18 from a signal source (not shown in FIG. 1).
• the signal source may include, for example, a microphone for converting sound waves into electronic signals and sampling and analog-to-digital converter electronics for sampling and converting the electronic signals into digital signals representative of the sound waves.
• the signal source may include any suitable device for producing digital data signals for communication over channel 42, such as, but not limited to, a keyboard, a digital voice encoder, a mouse or other user input device, a sensor, monitor or testing apparatus, or the like.
• Modulator 16 provides a transmit IF information signal 32 as an output to a transmitter 20.
• a transmit RF information signal 26 is produced by transmitter 20 for transmission from an antenna 22.
• Receiving unit 14 includes a receiver 24 coupled to antenna 22 to process a receive RF information signal 44.
• Receiver 24 provides a modulated receive IF information signal 34 to a demodulator 28, which demodulates receive IF information signal 34 and generates receive baseband information signals 46.
• the demodulated receive baseband information signals 46 from demodulator 28 may be provided to signal processing electronics, sound producing electronics or the like, depending upon the nature of use of the transceiver 10.
• the transmitting and receiving units 12 and 14 include further components, power supplies, and the like, well known in the art for effecting transmission and reception of signals and for carrying out other functions specific to the nature and application of use of the transceiver 10.
• each transmitting unit 12 and receiving unit 14 is configured to function as both a transmitting unit and a receiving unit.
• transmitting unit 12 and receiving unit 14 transmit and receive signals directly therebetween.
• transmitting unit 12 and receiving unit 14 communicate through one or more additional transceiver stations 30 (such as repeaters, base or cell stations, or the like).
• baseband information signal 18 provides sampled voice (or sound) signals in the form of baseband I and Q channel signals to an encoder 36.
• encoder 36 comprises a Phase Shift Key encoder, such as, but not limited to, a ⁇ /4-shift Quadrature Phase Shift Key mapper with differential encoder ( ⁇ /4 DQPSK), and shaping filters 38 comprise pulse shaping filters for smoothing the encoder output signal.
• I and Q outputs of the encoder pass through shaping filters 38 and then to frequency conversion and modulation electronics 40, the output of which comprises a transmit IF information signal 32.
• Transmit IF information signal 32 is then fed to transmitter 20 as shown in FIG. 1 , which provides the transmit RF information signal
• FIG. 3 A shared functional block communication transceiver with GPS capability 48 according to an embodiment of the present invention is illustrated in FIG. 3.
• the transceiver 48 includes a modulator 16 as described above with reference to FIG. 2.
• the communication transceiver with GPS capability 48 of FIG. 3 is switchable between the CDMA and GPS communication standards.
• frequency conversion and modulation electronics 40 receive the I and Q outputs of shaping filters 38 and modulate a transmit IF LO 50 with the I and Q outputs to produce a transmit IF information signal 32. Transmit IF
• LO 50 is generated by a transmit IF frequency generator 52 comprising a transmit IF frequency source 54 phase-locked to a reference source 58 by transmit IF loop electronics 56.
• transmit IF frequency source 54 is a voltage controlled oscillator (VCO).
• VCO voltage controlled oscillator
• transmit IF frequency source 54 may be any adjustable frequency source.
• Transmit IF information signal 32 is then amplified by a transmit IF variable gain amplifier (VGA) 60 within transmitter 20.
• VGA transmit IF variable gain amplifier
• the CDMA communication standard requires transmit power control from +23 dB to -50 dBm at the antenna, representing a 73 dB dynamic range requirement.
• Transmit IF VGA 60 provides this power control by adjusting its gain based on commands received from the base station.
• the output of transmit IF VGA 60 is then filtered by transmit IF filter 62, which filters out noise generated by the transmit IF VGA 60 in the receive band to meet receive band noise floor requirements.
• Transmit IF filter 62 has a center frequency approximately equivalent to the IF carrier frequency and a bandwidth sufficient to pass the modulated and amplified transmit IF information signal with minimal distortion.
• the modulation bandwidth of the transmit IF information signal is 1.25 MHz, thus the bandwidth of transmit IF filter 62 must be at least 1.25 MHz. In preferred embodiments, the bandwidth of transmit IF filter 62 is about 5 MHz.
• transmit upconverter mixer 66 In preferred embodiments, transmit upconverter mixer 66 generates the difference between the output of transmit IF filter 62 and transmit RF LO 64. In alternative (non-CDMA) embodiments, transmit upconverter mixer 66 is replaced by a translation loop upconverter (not shown in FIG. 3). In embodiments of the present invention, transmit RF LO 64 is generated by a transmit RF frequency generator 68 containing a transmit RF frequency source 70 phase-locked to reference source 58 by transmit RF loop electronics 72. In preferred embodiments, transmit RF frequency source 70 comprises a VCO. However, in alternative embodiments, transmit RF frequency source 70 may be any adjustable frequency source.
• transmit upconverter mixer 66 The output of transmit upconverter mixer 66 is filtered by first transmit RF filter 74, which has a passband encompassing the CDMA/analog AMPS transmit band of 824-849 MHz to remove spurious frequencies generated by transmit upconverter mixer 66.
• the output of first transmit RF filter 74 is then amplified by transmit RF driver amplifier 76, which takes the low level output of first transmit RF filter 74 and amplifies it to mid-levels on the order of 0.10 dBm.
• transmit RF driver amplifier 76 is then filtered by second transmit RF filter 78, which has a passband encompassing the CDMA/analog AMPS transmit band of 824-849 MHz to filter out noise in the CDMA/analog AMPS receive band generated by transmit RF driver amplifier 76.
• the output of second transmit RF filter 78 is then amplified by transmit RF power amplifier 80 to generate transmit RF information signal 26 at a level sufficient to meet output power requirements at antenna 22.
• Transmit RF information signal 26 is then filtered by duplexer 82, which has a transmit passband encompassing the CDMA transmit band of 824-849 MHz to filter out-of-band noise generated by transmit RF power amplifier 80.
• duplexer 82 passes through service select switch 84 within antenna coupling electronics 86 before being transmitted by antenna 22.
• signals from antenna 22 enter antenna coupling electronics 86, where they pass through service select switch 84 and are filtered by duplexer 82 having a receive passband encompassing the CDMA/analog AMPS receive band of 869-894 MHz for passing only CDMA/analog AMPS signals.
• the output of duplexer 82 is receive RF information signal 44, which passes through a variable gain attenuator 88 in preferred embodiments of the present invention.
• Variable gain attenuator 88 selectively attenuates the received signal to meet CDMA communication standard cellular receive band intermodulation requirements.
• attenuation control may be achieved by selectively bypassing receive RF low noise amplifier (LNA) 90, or a variable gain receive RF LNA 90 may be employed instead of variable gain attenuator 88.
• LNA receive RF low noise amplifier
• variable gain attenuator 88 The output of variable gain attenuator 88 is then amplified by a receive RF LNA 90.
• receive RF LNA 90 has a noise figure (NF) of about 1.5 dB with a gain of about 20 dB.
• Receive RF image reject filter 92 is a bandpass filter with a bandwidth encompassing the CDMA analog AMPS receive band of 869-894 MHz to filter out image noise generated by receive RF LNA 90 capable of mixing with receive RF LO 94 in receive downconverter mixer 96 and producing unwanted signals in the IF band.
• an image reject mixer could be used to eliminate the need for the RF image reject filter.
• receive RF LO 94 is generated by a receive RF frequency generator 130 comprised of a receive RF frequency source 134 phase-locked to reference source 58 by receive RF loop electronics 136.
• receive RF frequency source 134 is a VCO.
• receive RF frequency source 134 may be any adjustable frequency source.
• receive downconverter mixer 96 generates the difference between the output of receive RF image reject filter 92 and receive RF LO 94, designated herein as receive IF information signal 158.
• Receive IF information signal 158 then passes through either narrowband CDMA receive IF filter 98 with a bandwidth encompassing the CDMA modulation bandwidth of 1.25 MHz, or narrowband AMPS receive IF filter 99 with a bandwidth encompassing the AMPS modulation bandwidth of 30 kHz.
• the choice of filter is switchably selectable depending on whether CDMA or AMPS is being used. These filters remove spurious frequencies generated by receive downconverter mixer 96.
• common IF VGA 100 has a dynamic range of about 90 dB.
• Common IF VGA 100 provides automatic gain control by adjusting its gain to maintain a relatively constant level into quantizers 118 in the receive path.
• the output of common IF VGA 100 is common IF information signal 156.
• Common IF information signal 156 is mixed with receive IF LO 132 and demodulated by frequency conversion and demodulation electronics 114 within demodulator 28.
• receive IF LO 132 is generated by a receive IF frequency generator 122, which is comprised of a receive IF • frequency source 124 phase-locked to a reference source 58 by receive IF loop electronics 128.
• receive IF frequency source 124 is a VCO.
• receive IF frequency source 124 may be any adjustable frequency source.
• Frequency conversion and demodulation electronics 114 produce baseband information signals 148, defined herein as either DC or a "near DC" IF (for example, a center frequency of about 1 MHz).
• these baseband information signals 148 comprise receive baseband signals which are filtered by CDMA baseband filters 116 and analog AMPS baseband filters 140 to remove spurious frequencies generated by frequency conversion and demodulation electronics 114.
• Analog AMPS baseband filters 140 have a bandwidth of about 30 kHz to accommodate the modulation bandwidth of analog AMPS receive baseband signals, and may be low pass filters if the receive baseband signals are DC, or bandpass filters if the receive baseband signals are near DC.
• CDMA baseband filters 116 have a bandwidth of about 1.25 MHz to accommodate the modulation bandwidth of CDMA receive baseband signals, and may be low pass filters if the receive baseband signals are DC, or bandpass filters if the receive baseband signals are near DC.
• the filtered and demodulated receive baseband signals are then processed by quantizers 118, which generate CDMA I and Q outputs 150 and analog AMPS I and Q outputs 152.
• quantizers 118 are analog-to-digital converters (ADCs).
• GPS RF information signal 104 collected from antenna 22 passes through service select switch 84 and a preselector filter 102 having a passband encompassing the GPS receive band of 1575.42 MHz ⁇ 1 MHz to pass only GPS frequencies and remove out-of-band frequencies.
• the filtered GPS RF information signal then passes through a GPS RF LNA 106 for amplifying the GPS
• GPS RF LNA 106 has a noise figure (NF) of about 1.5 dB with a gain of about 20 dB.
• GPS RF image reject filter 108 is a bandpass filter with a bandwidth of about 1575.42 MHz ⁇ 1 MHz to filter out image noise generated by GPS RF LNA 106 capable of mixing with receive RF LO 94 and producing unwanted signals in the IF band.
• an image reject mixer could be used to eliminate the need for the RF image reject filter.
• GPS downconverter mixer 110 generates the difference between the output of GPS RF image reject filter 108 and receive RF LO 94, designated herein as GPS IF information signal 160.
• receive RF LO 94 as used by GPS downconverter mixer 110 is not generated by receive RF frequency source 134. Instead, receive RF LO 94 as used by GPS downconverter mixer 110 is generated by a
• GPS RF frequency source 138 in parallel with receive RF frequency source 134 and phase-locked to reference source 58 by receive RF loop electronics 136.
• GPS RF frequency source 138 is a VCO.
• GPS RF frequency source 138 may be any adjustable frequency source.
• GPS IF information signal 160 then passes through a narrowband GPS IF filter
• Narrowband GPS IF filter 112 for filtering spurious frequencies generated by GPS downconverter mixer 110.
• Narrowband GPS IF filter 112 has a bandwidth of about 2 MHz to accommodate the GPS modulation bandwidth.
• the output of narrowband GPS IF filter 112 is then amplified by common IF VGA 100.
• further sharing of the receiver front end functional blocks could be achieved if narrowband GPS IF filter 112 and narrowband CDMA receive IF filter 98 are combined into a single filter with a bandwidth that encompasses both the GPS and CDMA modulation bandwidths.
• the outputs of narrowband CDMA receive IF filter 98 and narrowband AMPS receive IF filter 99 are also amplified by common IF VGA 100 to produce common IF information signal 156.
• the direct coupling of the output of these filters is achievable because only one will be passing a signal at any time as controlled by service select switch 84.
• further sharing of the receiver front end blocks may be achieved if a switchable broadband LNA and mixer capable of covering both CDMA and GPS bands is used.
• the paralleled LNAs, filters, and mixers would be replaced by a single LNA, filter, and mixer, switchably couplable to the GPS RF information signal 104 or the receive RF information signal 44.
• Common IF information signal 156 is then mixed with receive IF LO 132 and demodulated by frequency conversion and demodulation electronics 114 within demodulator 28. Because the IF frequencies of CDMA analog AMPS and GPS are different, receive IF LO 132 as used for GPS demodulation is not generated by receive IF frequency source 124. Instead, receive IF LO 132 as used for GPS demodulation is generated by a GPS IF frequency source 126 in parallel with receive IF frequency source 124 and phase-locked to reference source 58 by receive IF loop electronics 128. In preferred embodiments of the present invention, GPS IF frequency source
• GPS IF frequency source 126 is a VCO.
• GPS IF frequency source 126 may be any adjustable frequency source.
• Frequency conversion and demodulation electronics 114 produce baseband information signals 148.
• these baseband information signals 148 comprise GPS baseband signals which are filtered by GPS baseband filters 142 to remove spurious frequencies generated by frequency conversion and demodulation electronics 114.
• GPS baseband filters 142 have a bandwidth of about 2 MHz to accommodate the modulation bandwidth of GPS baseband signals, and may be low pass filters if the receive baseband signals are DC, or bandpass filters if the receive baseband signals are near DC.
• the filtered and demodulated signals are then processed by quantizers 118, which generate GPS I and Q outputs 154.
• full GPS processing is provided by coupling GPS I and Q outputs 154 of quantizers 118 to a full GPS processor 144.
• full GPS processor 144 In preferred embodiments of the present invention, full GPS processor
• 144 is a ScorpioTM device, Rockwell part number 11577, incorporated herein by reference.
• E911 support capability is provided by coupling a Coleman filter 146 between frequency conversion and demodulation electronics 114 and GPS baseband filters 142.
• Coleman filter 146 is a subset of the full GPS processor 144, and comprises a matched filter that despreads the spread spectrum GPS I and Q outputs to generate baseband signals in a format ready for baseband processing by a baseband modem (comprising a receiver, controller, and all baseband digital signal processing (DSP)). Because the Coleman filter 146 is a subset of the full GPS processor 144, alternative embodiments of the present invention with both full GPS capability and E911 support only need the full GPS processor 144, and do not require Coleman filter 146.
• service selector electronics 120 configures the communication transceiver with GPS capability 48 for either CDMA or GPS operation.
• service selector electronics 120 is a processor programmable by remote commands.
• service selector electronics 120 may comprise a factory-programmable logic device or user-configurable logic.
• service select switch 84 is configured to couple duplexer 82 to antenna 22
• receive RF frequency generator 130 is configured to couple receive RF frequency source 134 to receive downconverter mixer 96
• receive IF frequency generator 122 is configured to couple receive IF frequency source 124 to frequency conversion and demodulation electronics 114.
• service select switch 84 is configured to couple preselector filter 102 to antenna 22
• receive RF frequency generator 130 is configured to couple GPS RF frequency source 138 to receive downconverter mixer 96
• receive IF frequency generator 122 is configured to couple GPS IF frequency source 126 to frequency conversion and demodulation electronics 114.
• Embodiments of the present invention described above employ a separate transmit IF frequency source 54, receive IF frequency source 124, and GPS IF frequency source 126, along with separate transmit IF loop electronics 56 and receive IF loop electronics 128.
• receive IF frequency source 124 and GPS IF frequency source 126 may comprise a common IF frequency source, or in further alternative embodiments, transmit IF frequency source 54, receive IF frequency source 124, and GPS IF frequency source 126 may comprise a common IF frequency source, and transmit IF loop electronics 56 and receive IF loop electronics 128 may comprise the same electronics.
• service selector electronics 120 configures the common loop electronics to produce the desired frequency from the common frequency source.
• Embodiments of the present invention described above employ a separate transmit RF frequency source 70, receive RF frequency source 134, and GPS RF frequency source 138, along with separate transmit RF loop electronics 72 and receive RF loop electronics 136.
• receive RF frequency source 134 and GPS RF frequency source 138 may comprise a common RF frequency source, or in further alternative embodiments, transmit RF frequency source 70, receive RF frequency source 134, and GPS RF frequency source 138 may comprise a common RF frequency source, and transmit RF loop electronics 72 and receive RF loop electronics 136 may comprise the same electronics.
• service selector electronics 120 configures the common loop electronics to produce the desired frequency from the common frequency source.
• Multi-band transceivers employ a combination of parallel functional blocks in the RF sections, and shared functional blocks in the IF sections.
• preferred embodiments of the present invention provide a system and process for a multi-band communication unit that shares the same frequency sources and filters between transmitters and receivers and between bands to minimize size, weight, complexity, power consumption, and cost.

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• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Radar, Positioning & Navigation (AREA)
• Remote Sensing (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Position Fixing By Use Of Radio Waves (AREA)
• Transceivers (AREA)

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• 2000
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