Multi-channel digital transceiver and method

• US 5,579,341 A
• Filed: 12/29/1994
• Issued: 11/26/1996
• Est. Priority Date: 12/29/1994
• Status: Expired due to Term

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Rader, Shelia M., Smith, Paul F., Smith, John M., Rottinghaus, Alan P., Pinckley, Danny T., Luz, Yuda Y., Laird, Kevin M., Bailey, Donald E., Elder, Robert C., Lurey, Daniel M., Kobrinetz, Tony
• Primary Examiner(s): TSE, YOUNG TOI
• Application Number:
  US08/366,283
• Time in Patent Office: 698 Days
• Field of Search: 375/200, 375/219-220, 375/259, 375/260, 375/267, 375/295, 375/299, 375/347, 375/350, 455/31.1, 455/33.1, 455/78, 455/84, 455/101, 455/103, 455/132-133, 455/272, 455/277.1, 455/277.2, 364/724.1
• US Class Current: 375/267
• CPC Class Codes: H01Q 1/246 specially adapted for base stations
• CPC Class Codes: H01Q 3/2605 Array of radiating elements provided with a feedback control over the element weights, e.g. adaptive arrays
• CPC Class Codes: H03B 28/00 Generation of oscillations by methods not covered by groups H03B5/00 - H03B27/00, including modification of the waveform to produce sinusoidal oscillations analogue function generators for performing computing operations G06G7/26; use of transformers for conversion of waveform in ac-ac converters H02M5/18
• CPC Class Codes: H03C 1/00 Amplitude modulation H03C5/00, H03C7/00 take precedence
• CPC Class Codes: H03C 3/00 Angle modulation H03C5/00, H03C7/00 take precedence
• CPC Class Codes: H03D 7/165 at least two frequency changers being located in different paths, e.g. in two paths with carriers in quadrature combined with amplitude demodulation H03D1/2245, combined with angle demodulation H03D3/007; N-path filters H03H19/002
• CPC Class Codes: H04B 1/0003 Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain digital baseband systems H04L25/00; digital modulation/demodulation H04L27/00; CDMA H04B1/707; TDMA H04B7/2643; image transmission H04N5/00
• CPC Class Codes: H04B 1/001 Channel filtering, i.e. selecting a frequency channel within the SDR system multiplexing of multicarrier modulation signals being represented by different frequencies H04L5/06; multiplexing of multicarrier modulation signals H04L5/023
• CPC Class Codes: H04B 1/0017 Digital filtering H04B1/001 takes precedence; digital filters per se H03H17/00
• CPC Class Codes: H04B 1/0021 Decimation, i.e. data rate reduction techniques H04B1/0025 takes precedence
• CPC Class Codes: H04B 1/0483 Transmitters with multiple parallel paths
• CPC Class Codes: H04B 1/16 Circuits
• CPC Class Codes: H04B 1/26 for superheterodyne receivers multiple frequency-changing H03D7/16
• CPC Class Codes: H04B 1/28 the receiver comprising at least one semiconductor device having three or more electrodes
• CPC Class Codes: H04B 1/38 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
• CPC Class Codes: H04B 1/40 Circuits
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04B 7/06 at the transmitting station
• CPC Class Codes: H04B 7/0691 using subgroups of transmit antennas
• CPC Class Codes: H04B 7/0802 using antenna selection H04B7/0868 takes precedence; antenna beam directivity switching H01Q3/24
• CPC Class Codes: H04B 7/0874 : using subgroups of receive antennas
• CPC Class Codes: H04B 7/18515 : Transmission equipment in satellites or space-based relays
• CPC Class Codes: H04B 7/24 : for communication between two or more posts wireless communication networks H04W
• CPC Class Codes: H04L 1/06 : using space diversity
• CPC Class Codes: H04L 1/22 : using redundant apparatus to increase reliability
• CPC Class Codes: H04W 4/18 : Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
• CPC Class Codes: H04W 88/06 : adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

A multi-channel digital transceiver (400) receives uplink radio frequency signals and converts these signals to digital intermediate frequency signals. Digital signal processing, including a digital converter module (426), is employed to select digital intermediate frequency signals received at a plurality of antennas (412) and to convert these signals to baseband signals. The baseband signals are processed to recover a communication channel therefrom. Downlink baseband signals are also processed and digital signal processing within the digital converter module (426) up converters and modulates the downlink baseband signals to digital intermediate frequency signals. The digital intermediate frequency signals are converted to analog radio frequency signals, amplified and radiated from transmit antennas (420).

Claims

1. A multi-channel digital receiver comprising:

a first receiver bank, the first receiver bank comprising;

a first plurality of radio frequency converters each coupled to a first plurality of antennas and operable to convert radio frequency signals received at the first plurality of antennas to a first set of intermediate frequency signals;

a first plurality of analog-to-digital converters coupled to each of the first plurality of radio frequency converters for converting the first set of intermediate frequency signals to a first set of digital signals;

a first switched digital down converter coupled to the first plurality of analog-to-digital converters and operable for selecting one of the first set of digital signals and converting the one of the first set of digital signals to a first baseband intermediate frequency signal;

a second receiver bank, the second receiver bank comprising;

a second plurality of radio frequency converters each coupled to a second plurality of antennas and operable to convert radio frequency signals received at the second plurality of antennas to a second set of intermediate frequency signals;

a second plurality of analog-to-digital converters coupled to each of the second plurality radio frequency converters for converting the second set of intermediate frequency signals to a second set of digital signals;

a second switched digital down converter coupled to the second plurality of analog-to-digital converters and operable for selecting one of the second set of digital signals and converting the one of the second set of digital signals to a second baseband intermediate frequency signal; and

a plurality of channel processors coupled to the first and second switched digital down converters via a bus for recovering one of a plurality of communication channels contained within the first and second baseband intermediate frequency signals.

2. The multi-channel digital receiver as in claim 1 wherein the first switched digital down converter comprises a first plurality of switched digital down converters.

3. The multi-channel digital receiver as in claim 2 wherein each of the first plurality of switched digital down converters are coupled to the first plurality of analog-to-digital converters.

4. The multi-channel digital receiver as in claim 2, further comprising a first bus for connecting the first plurality of digital down converters to the plurality of channel processors.

5. The multi-channel digital receiver as in claim 1, wherein the second switched digital down converter comprises a second plurality of switched digital down converters.

6. The multi-channel digital receiver as in claim 5, further comprising a second bus for connecting the second plurality of digital down converters to the plurality of channel processors.

7. A multi-channel digital transmitter comprising:

a plurality of channel processors in communication with a communication system for receiving digital downlink communication signals and for processing the digital downlink communication signals for transmission on one of a plurality of communication channels;

a plurality of up converters/modulators respectively associated with each of the plurality of communication channels and connected to the channel processors for up converting and modulating the digital downlink communication signals to digital intermediate frequency signals;

a plurality of digital summers connecting the up converters/modulators for summing the digital intermediate frequency signals into digital intermediate frequency signal sub-groups;

a plurality of digital-to-analog converters for converting the digital intermediate frequency signal sub-groups into a plurality of analog signals;

a plurality of radio-frequency up converters respectively coupled to the digital-to-analog converters for converting the analog signals to radio frequency signals; and

a plurality of power amplifiers respectively coupled to the up converters for amplifying the radio frequency signals and for communicating the radio frequency signals to a plurality of antennas.

8. The multi-channel digital transmitter as in claim 7 wherein the sub-groups of digital intermediate frequency signals are associated with a plurality of sectors of a sectorized communication system.

9. The multi-channel digital transmitter as in claim 7 wherein the plurality of up converter/modulators are connected to the channel processors via a time domain multiplex bus.

10. The multi-channel digital transmitter as in claim 7 wherein the plurality of digital summers comprise signal selectors for selecting a sub-group of the digital intermediate frequency signals for summing into digital intermediate frequency sub-groups.

11. The transmitter of claim 7, further comprising a bypass data link in communication with at least one of the plurality of channel processors.

12. The transmitter of claim 7, wherein at least one of the plurality of channel processors is in remote communication with at least one of the plurality of up converters/modulators.

13. A multi-channel digital transmitter comprising:

a plurality of channel processors in communication with a communication system for receiving digital downlink communication signals and for processing the digital downlink communication signals for transmission on one of a plurality of communication channels;

a plurality of up converters/modulators respectively associated with each of the plurality of communication channels and connected to the channel processors for up converting and modulating the digital downlink communication signals to digital intermediate frequency signals;

a plurality of digital summers connecting the up converters/modulators for summing the digital intermediate frequency signals into digital intermediate frequency signal sub-groups;

a plurality of digital-to-analog converters for converting the digital intermediate frequency signal sub-groups into analog signals;

an analog summer selectively connected to the digital-to-analog converters for summing a sub-set of the analog signals into an analog intermediate frequency signal;

a radio-frequency up converter coupled to the analog summer for converting the analog intermediate frequency signal to a radio frequency signal; and

a power amplifier coupled to the radio-frequency up converter for amplifying the radio frequency signal and for communicating the radio frequency signal to an antenna.

14. The multi-channel digital transmitter as in claim 13 wherein the sub-set of the plurality of analog signals are associated with a sector of a sectorized communication system.

15. The multi-channel digital transmitter as in claim 13 wherein the plurality of up converter/modulators are connected to the channel processors via a time domain multiplex bus.

16. The multi-channel digital transmitter as in claim 13 wherein the plurality of digital summers comprise signal selectors for selecting a sub-group of the digital intermediate frequency signals for summing into digital intermediate frequency sub-groups.

17. The transmitter of claim 13, wherein at least one of the plurality of up converters/modulators further comprises a selector.

18. The transmitter of claim 17, wherein the selector is in communication with at least one of the plurality of digital-to-analog converters.

19. The transmitter of claim 17, further comprising a bypass data link coupled to the selector.

20. The transmitter of claim 13, wherein at least one of the plurality of channel processors is in remote communication with at least one of the plurality of up converters/modulators.

21. A multi-channel digital transmitter comprising:

a plurality of channel processors in communication with a communication system for receiving digital downlink communication signals and for processing the digital downlink communication signals for transmission on one of a plurality of communication channels;

a plurality of radio frequency processing shelves, each of the radio frequency processing shelves comprising a plurality of up converters/modulators respectively associated with each of the plurality of communication channels and connected to the channel processors for up converting and modulating the digital downlink communication signals to digital intermediate frequency signals and a plurality of digital summers connecting the up converters/modulators for summing the digital intermediate frequency signals into digital intermediate frequency signal sub-groups;

a plurality of digital-to-analog converters for converting the digital intermediate frequency signal sub-groups into analog signals;

an analog summer selectively connected to the digital-to-analog converters for summing a sub-set of the analog signals into an analog intermediate frequency signal;

a radio-frequency up converter coupled to the analog summer for converting the analog intermediate frequency signal to a radio frequency signal; and

a power amplifier coupled to the radio-frequency up converter for amplifying the radio frequency signal and for communicating the radio frequency signal to an antenna.

22. The multi-channel digital transmitter as in claim 21 wherein the sub-groups of digital intermediate frequency signals are associated with sectors of a sectorized communication system.

23. The multi-channel digital transmitter as in claim 21 wherein the sub-set of the analog signals are associated with a sector of a sectorized communication system.

24. The multi-channel digital transmitter as in claim 21 wherein the plurality of up converters/modulators are connected to the channel processors via a time domain multiplex bus.

25. The multi-channel digital transmitter as in claim 21 wherein the plurality of digital summers comprise signal selectors for selecting a sub-group of the digital intermediate frequency signals for summing into digital intermediate frequency sub-groups.

26. The transmitter of claim 21, further comprising a plurality of analog summers, a first of the plurality of analog summers responsive to a first group of the plurality of digital-to-analog converters and a second of the plurality of analog summers responsive to a second group of the plurality of digital-to-analog converters.

27. The transmitter of claim 21, wherein the first group of the plurality of digital-to-analog converters includes at least three digital-to-analog converters.

28. A multi-channel digital transmitter comprising:

a plurality of channel processors in communication with a communication system for receiving digital downlink communication signals and for processing the digital downlink communication signals for transmission on one of a plurality of communication channels;

a plurality of transmitter banks, each of the transmitter banks comprising;

(a) a plurality of radio frequency processing shelves, each of the radio frequency processing shelves comprising a plurality of up converters/modulators respectively associated with each of the plurality of communication channels and connected to the channel processors for up converting and modulating the digital downlink communication signals to digital intermediate frequency signals and a plurality of digital summers connecting the up converters/modulators for summing the digital intermediate frequency signals into digital intermediate frequency signal sub-groups;

(b) a plurality of digital-to-analog converters for converting the digital intermediate frequency signal sub-groups into analog signals;

(c) a plurality of analog summers selectively connected to the digital-to-analog converters for summing a sub-set of the analog signals into analog intermediate frequency signals;

(d) a plurality of radio-frequency up converters coupled to the plurality of analog summers for converting the analog intermediate frequency signals to radio frequency signals;

a plurality of radio-frequency summers for summing sub-sets of radio frequency signals into a summed radio frequency signals; and

a plurality of power amplifiers respectively coupled to the radio-frequency summers for amplifying the summed radio frequency signals and for communicating the summed radio frequency signals to antennas.

29. The multi-channel digital transmitter as in claim 28 wherein the sub-groups of digital intermediate frequency signals are associated with sectors of a sectorized communication system.

30. The multi-channel digital transmitter as in claim 28 wherein the sub-set of the analog signals are associated with a sector of a sectorized communication system.

31. The multi-channel digital transmitter as in claim 28 wherein the plurality of up converters/modulators are connected to the channel processors via a time domain multiplex bus.

32. The multi-channel digital transmitter as in claim 28 wherein the plurality of digital summers comprise signal selectors for selecting a sub-group of the digital intermediate frequency signals for summing into digital intermediate frequency sub-groups.

33. A method of digitally transmitting a multi-channel wideband frequency signal comprising the steps of:

receiving digital downlink signals from a communication network interconnect of a communication system;

processing the digital downlink signals for transmission on one of a plurality of communication channels;

up converting and modulating the digital downlink signals to digital intermediate frequency signals;

summing sub-groups of the digital intermediate frequency signals;

directing the sub-groups of the digital intermediate frequency signals, respectively, to sectors of the communication system;

converting the summed sub-groups of the digital intermediate frequency signals to analog intermediate frequency signals;

summing the analog intermediate frequency signals from a plurality of downlink signal sources into sub-sets of analog intermediate frequency signals, the sub-sets of analog intermediate frequency signals being associated with a sector of the communication system;

up converting the sub-sets of the analog intermediated frequency signals to radio frequency signals;

amplifying the radio frequency signals; and

radiating the radio frequency signals from an antenna.

34. A method of digitally transmitting a multi-channel wideband frequency signal comprising the steps of:

receiving digital downlink signals from a communication network interconnect of a communication system;

processing the digital downlink signals for transmission on one of a plurality of communication channels;

up converting and modulating the digital downlink signals to digital intermediate frequency signals;

directing sub-groups of the digital intermediate frequency signals, respectively, to sectors of the communication system;

summing the directed sub-groups of the digital intermediated frequency signals;

converting the summed sub-groups of the digital intermediate frequency signals to analog intermediate frequency signals;

up converting the analog intermediate frequency signals to radio frequency signals;

radio frequency summing the radio frequency signals from a plurality of downlink signal sources into sub-sets of radio frequency signals, the sub-sets of radio frequency signals being associated with a sector of the communication system;

amplifying the summed radio frequency signals; and

radiating the amplified radio frequency signals from an antenna.

35. A multi-channel wideband frequency transceiver comprising:

a plurality of receive antennas for receiving radio frequency signals;

a plurality of radio frequency converters coupled to each of the plurality of receive antennas and operable to convert the radio frequency signals to intermediate frequency signals;

a plurality of analog-to-digital converters coupled to each of the radio frequency converters for converting the intermediate frequency signals to digital signals;

a switched digital down converter coupled to the analog-to-digital converters and operable for selecting one of the digital signals and converting the one of the digital signals to a baseband intermediate frequency signal;

a plurality of channel processors coupled to the switched digital down converter for recovering one of a plurality of communication channels contained within the baseband intermediate frequency signal and for communicating the recovered communication channel to a network interconnect of a communication system;

the plurality of channel processors being further operable to receive digital downlink communication signals from the network interconnect and for processing the digital downlink communication signals for transmission on one of the plurality of communication channels;

a plurality of up converters/modulators respectively associated with each of the plurality of communication channels and connected to the channel processors for up converting and modulating the digital downlink communication signals to digital intermediate frequency signals;

a plurality of digital summers connecting the up converters/modulators for summing the digital intermediate frequency signals into digital intermediate frequency signal sub-groups;

a plurality of digital-to-analog converters for converting the digital intermediate frequency signal sub-groups into analog signals;

an analog summer selectively connected to the digital-to-analog converters for summing a sub-set of the analog signals into an analog intermediate frequency signal;

a radio-frequency up converter coupled to the analog summer for converting the analog intermediate frequency signal to a radio frequency signal; and

a power amplifier coupled to the radio-frequency up converter for amplifying the radio frequency signal and for communicating the radio frequency signal to a transmit antenna.