WO2013063575A1 - Carrier frequency offset compensation in beamforming systems - Google Patents

Carrier frequency offset compensation in beamforming systems Download PDF

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Publication number
WO2013063575A1
WO2013063575A1 PCT/US2012/062428 US2012062428W WO2013063575A1 WO 2013063575 A1 WO2013063575 A1 WO 2013063575A1 US 2012062428 W US2012062428 W US 2012062428W WO 2013063575 A1 WO2013063575 A1 WO 2013063575A1
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Prior art keywords
signal
phase
local oscillator
carrier frequency
coupled
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Ceased
Application number
PCT/US2012/062428
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French (fr)
Inventor
Nirmal C. Warke
Srinath Hosur
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Texas Instruments Japan Ltd
Texas Instruments Inc
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Texas Instruments Japan Ltd
Texas Instruments Inc
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Priority to JP2014539113A priority Critical patent/JP2014533020A/en
Priority to CN201280052982.8A priority patent/CN104040981A/en
Publication of WO2013063575A1 publication Critical patent/WO2013063575A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/086—Weighted combining using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0016—Stabilisation of local oscillators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0018—Arrangements at the transmitter end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0024—Carrier regulation at the receiver end
    • H04L2027/0026—Correction of carrier offset
    • H04L2027/0028—Correction of carrier offset at passband only

Definitions

  • This relates generally to phased arrays and, more particularly, to carrier frequency offset compensation in phased array systems.
  • FIG. 1 shows an example of a conventional communication system 100.
  • a transmitter 102 and a receiver 104 that each employ direct conversion circuitry, although superheterodyne circuitry can also employed.
  • a modulator which generally includes phase adjustment circuit 108-1 (which can, for example, be a hybrid) and mixers 106-1 and 106-2) and local oscillator 110-1 that receives in-phase (I) and quadrature (Q) signals from baseband circuitry 112-1 and upconverts these signals to a radio frequency (RF) signal.
  • the RF signals are then amplified by power amplifier (PA) 114 and transmitted to the receiver 104.
  • PA power amplifier
  • the receiver amplifies its received RF signals with low noise amplifier (LNA) 116 and downconverts these signals with a demodulator (which generally comprises misers 106-3 and 106-4 and phase adjustment circuitry 108-2) and local oscillator 110-2 so as to generate I and Q signals for the baseband circuitry 112-2.
  • LNA low noise amplifier
  • An embodiment provides an apparatus.
  • the apparatus comprises a receiver having a first local oscillator signal with a first carrier frequency; and a transmitter having: a second local oscillator signal with a second carrier frequency; a signal generator that receives the second local oscillator signal; a phased array; a plurality of phase rotators that are coupled between the signal generator and the phased array; and a beam steering circuit that is coupled to each phase rotator, wherein the beam steering circuit calculates an offset cancellation for the offset between the first carrier frequency and the second carrier frequency, and wherein the beam steering circuit applies the offset cancellation to each phase rotator.
  • the beam steering circuit further comprises: a phase controller that is configured to control the phase of each phase rotator; a carrier frequency offset calculator that is configured to calculate the offset cancellation; and a compensator that is configured to apply the offset cancellation to the phase controller.
  • the beam steering circuit is implemented as software embodied on a processor.
  • the signal generator further comprises: a signal source that generates in-phase (I) and quadrature (Q) signals; a local oscillator that generates the second local oscillator signal; a phase adjustment circuit is coupled to the local oscillator so as to receive the second local oscillator signal; a first mixer that is coupled to the signal source so as to receive the I signal and that is coupled to the phase adjustment circuit; and a second mixer that is coupled to the signal source so as to receive the Q signal and that is coupled to the phase adjustment circuit.
  • I in-phase
  • Q quadrature
  • the phase adjustment circuit further comprises a hybrid.
  • the signal source further comprises a baseband circuit.
  • phase rotators are adjusted on a per symbol basis.
  • a method comprises generating a baseband transmit signal having a plurality of data bits; upconverting the baseband transmit signal to a radio frequency (RF) transmit signal using a first local oscillator signal having a first carrier frequency; calculating an offset cancellation for the offset between the first carrier frequency and a second carrier frequency for a second local oscillator signal that is used to downconvert an RF receive signal; applying the offset cancellation to a plurality of phase rotators; and transmitting the RF transmit signal over a phased array.
  • RF radio frequency
  • the method further comprises adjusting the phase rotators on a per symbol basis.
  • the baseband transmit signal further comprises transmit I and
  • the step of upconverting further comprises: generating first and second phases of the first local oscillator signal; and mixing the I and Q signals with the first and second phases of the first oscillator signal, respectively.
  • an apparatus comprising a receiver having: an antenna; a low noise amplifier (LNA) that is coupled to the antenna; and a LNA that is coupled to the antenna; and a LNA.
  • LNA low noise amplifier
  • demodulator that is coupled to the LNA and that demodulates an RF receive signal using a first local oscillator signal with a first carrier frequency; and a transmitter having: a second local oscillator signal with a second carrier frequency; a signal generator that receives the second local oscillator signal; a phased array; a plurality of phase rotators that are coupled between the signal generator and the phased array; and a beam steering circuit that is coupled to each phase rotator, wherein the beam steering circuit calculates an offset cancellation for the offset between the first carrier frequency and the second carrier frequency, and wherein the beam steering circuit applies the offset cancellation to each phase rotator.
  • FIG. 1 is a diagram of an example of a conventional RF system
  • FIG. 2 is a diagram of an example of a constellation rotation in a 4-QAM system
  • FIGS. 3 and 4 are diagrams of examples of a system in accordance with an example embodiment implementing principles of the invention.
  • FIG. 5 is a diagram of an example of the beam steering circuit of FIGS. 3 and 4.
  • FIG. 3 illustrates an example of a system 200. As shown, the system 200 is similar to system 100, except that transmitter 102 has been replaced with transmitter 202.
  • Transmitter 202 (similar to transmitter 102) employs direct conversion circuitry, but
  • Transmitter 202-A uses a phased array (which is generally comprised of beam steering circuit 204, phase rotators 206-1 to 206-N, and PAs 208-1 to 208-N) that operates in the millimeter wave or terahertz frequency range.
  • a phased array system can be seen in U.S. Application No. 12/878,484, which is entitled “Terahertz Phased Array System,” filed September 9, 2010, and which is hereby incorporated by reference. This arrangement allows for a beam of directed terahertz or millimeter wave energy to be directed to the receiver 104 or to receiver 203-A.
  • Receiver 203-A is similar to receiver 104 except that includes LNAs 210-1 to 210-N, phase rotators 212-1 to 212-N and beam steering circuit 214, which allow the transmitter 202-A and receiver 203-A to point to one another.
  • LNAs 210-1 to 210-N LNAs 210-1 to 210-N
  • phase rotators 212-1 to 212-N beam steering circuit 214
  • beam steering circuit 214 An example of a system that can employ this arrangement are U.S.
  • modulator (mixers 106-1 and 106-2 and phase adjustment circuit 108-1) and demodulator (mixers 106-3 and 106-4 and phase adjustment circuit 108-2) of transmitter 202-A and receiver 203-B can be replaced by modulators 216-1 to 216-N and demodulators 218-1 to 218-N of transmitter 202-B and receiver 203-B, where the signals from local oscillators 110-1 and 110-2 being phase shifted by phase rotators 206-1 to 206-N and 212-1 to 212-N.
  • the receiver 203-A/203-B may also have a phased array of a different size from transmitter 202-A/202-B.
  • the beam steering circuit 204 and/or 214 (which can be seen in greater detail in
  • FIG. 5 can then be advantageously used to compensate for carrier frequency offset between the local oscillators 110-1 and 110-2.
  • the beam steering circuit 204 and/or 214 is implemented in hardware, but it can also be implemented (or have portions) implemented in software that is embodied on a processor (such as a digital signals processor or DSP).
  • the beam steering circuit 204 and/or 214 is generally comprised of a phase controller 302 (which is able to independently control the phase rotators 206-1 to 206-N and/or 212-1 to 212-N so as to control the direction of the beam), a carrier frequency (CF) offset calculator 304, and an (optional) compensator 304.
  • CF carrier frequency
  • the CF offset calculator 304 is able to calculate the carrier frequency offset between the local oscillators 1 10-1 and 110-2 using conventional techniques that employ training sequences or otherwise. Specifically, the CF offset calculator 304 is able to calculate a difference AF.
  • the received downconverted signal after the mixers 106-3 and 106-4 is proportional to:
  • phase rotators 206-1 to 206-N can be applied at the phase rotators 206-1 to 206-N to the transmitted or received si nal on a per symbol basis to yield a phase shift for phase path (i) at symbol (n) of:
  • the offset compensation can occur in receiver 203 or 104, the transmitter 202, or both; typically, offset compensation can occur in the receiver 203 or 104 can be performed if offset information is available at the receiver 203 or 104.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Transceivers (AREA)
  • Radio Transmission System (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

A method for communicating signals in an ultra high bandwidth system that compensates for carrier frequency offset is provided. A baseband transmit signal having a plurality of data bits is generated at a transmitter (202-A). The baseband transmit signal is upconverted to a radio frequency (RF) transmit signal using a first local oscillator signal having a first carrier frequency. An offset cancellation for the offset between the first carrier frequency and a second carrier frequency for a second local oscillator signal that is used to downconvert an RF receive signal is calculated. The offset cancellation is applied to a plurality of phase rotators, and the RF transmit signal is transmitted over a phased array which is generally comprised of a beam steering circuit (204), phase rotators (206-1 to 206-N), and power amplifiers (208-1 to 208-N).

Description

CARRIER FREQUENCY OFFSET COMPENSATION IN BEAMFORMING SYSTEMS
[0001] This relates generally to phased arrays and, more particularly, to carrier frequency offset compensation in phased array systems.
BACKGROUND
[0002] FIG. 1 shows an example of a conventional communication system 100. In this system 100, there is a transmitter 102 and a receiver 104 that each employ direct conversion circuitry, although superheterodyne circuitry can also employed. For the transmitter 102, there is a modulator (which generally includes phase adjustment circuit 108-1 (which can, for example, be a hybrid) and mixers 106-1 and 106-2) and local oscillator 110-1 that receives in-phase (I) and quadrature (Q) signals from baseband circuitry 112-1 and upconverts these signals to a radio frequency (RF) signal. The RF signals are then amplified by power amplifier (PA) 114 and transmitted to the receiver 104. The receiver amplifies its received RF signals with low noise amplifier (LNA) 116 and downconverts these signals with a demodulator (which generally comprises misers 106-3 and 106-4 and phase adjustment circuitry 108-2) and local oscillator 110-2 so as to generate I and Q signals for the baseband circuitry 112-2.
[0003] One issue with this arrangement is that it is difficult to have matching local oscillator signals (from local oscillators 110-1 and 110-2). If there is a difference in frequency the constellation can rotate; an example of which can be seen in FIG. 2, where there is a constellation rotation of a 4-QAM (quadrature amplitude modulation) system. This frequency difference is known as a carrier frequency offset, and, in conventional RF communications systems, carrier frequency offset compensation is usually accomplished by rotating the received baseband constellation (in the digital domain). Performing such digital compensation, however, can be impractical in ultrahigh bandwidth systems (such as millimeter wave or terahertz systems). Therefore, there is a need for analog low cost carrier frequency offset compensation in ultrahigh bandwidth systems.
[0004] Some examples of conventional systems are described in: U.S. Patent No.
4,166,274; and Gooch et al., "The CM Array: An Adaptive Beamformer for Constant Modulus Signals," 1986 IEEE International Conference on Acoustics, Speech, and Signal Processing
(ICASSP '86), April 1986, pp. 2523-2526.
SUMMARY
[0005] An embodiment provides an apparatus. The apparatus comprises a receiver having a first local oscillator signal with a first carrier frequency; and a transmitter having: a second local oscillator signal with a second carrier frequency; a signal generator that receives the second local oscillator signal; a phased array; a plurality of phase rotators that are coupled between the signal generator and the phased array; and a beam steering circuit that is coupled to each phase rotator, wherein the beam steering circuit calculates an offset cancellation for the offset between the first carrier frequency and the second carrier frequency, and wherein the beam steering circuit applies the offset cancellation to each phase rotator.
[0006] In an embodiment, the beam steering circuit further comprises: a phase controller that is configured to control the phase of each phase rotator; a carrier frequency offset calculator that is configured to calculate the offset cancellation; and a compensator that is configured to apply the offset cancellation to the phase controller.
[0007] In an embodiment, the beam steering circuit is implemented as software embodied on a processor.
[0008] In an embodiment, the signal generator further comprises: a signal source that generates in-phase (I) and quadrature (Q) signals; a local oscillator that generates the second local oscillator signal; a phase adjustment circuit is coupled to the local oscillator so as to receive the second local oscillator signal; a first mixer that is coupled to the signal source so as to receive the I signal and that is coupled to the phase adjustment circuit; and a second mixer that is coupled to the signal source so as to receive the Q signal and that is coupled to the phase adjustment circuit.
[0009] In an embodiment, the phase adjustment circuit further comprises a hybrid.
[0010] In an embodiment, the signal source further comprises a baseband circuit.
[0011] In an embodiment, the phase rotators are adjusted on a per symbol basis.
[0012] In an embodiment, a method is provided. The method comprises generating a baseband transmit signal having a plurality of data bits; upconverting the baseband transmit signal to a radio frequency (RF) transmit signal using a first local oscillator signal having a first carrier frequency; calculating an offset cancellation for the offset between the first carrier frequency and a second carrier frequency for a second local oscillator signal that is used to downconvert an RF receive signal; applying the offset cancellation to a plurality of phase rotators; and transmitting the RF transmit signal over a phased array.
[0013] In an embodiment, the method further comprises adjusting the phase rotators on a per symbol basis.
[0014] In an embodiment, the baseband transmit signal further comprises transmit I and
Q signals.
[0015] In an embodiment, the step of upconverting further comprises: generating first and second phases of the first local oscillator signal; and mixing the I and Q signals with the first and second phases of the first oscillator signal, respectively.
[0016] In an embodiment, an apparatus is provided. The apparatus comprises a receiver having: an antenna; a low noise amplifier (LNA) that is coupled to the antenna; and a
demodulator that is coupled to the LNA and that demodulates an RF receive signal using a first local oscillator signal with a first carrier frequency; and a transmitter having: a second local oscillator signal with a second carrier frequency; a signal generator that receives the second local oscillator signal; a phased array; a plurality of phase rotators that are coupled between the signal generator and the phased array; and a beam steering circuit that is coupled to each phase rotator, wherein the beam steering circuit calculates an offset cancellation for the offset between the first carrier frequency and the second carrier frequency, and wherein the beam steering circuit applies the offset cancellation to each phase rotator.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] FIG. 1 is a diagram of an example of a conventional RF system;
[0018] FIG. 2 is a diagram of an example of a constellation rotation in a 4-QAM system;
[0019] FIGS. 3 and 4 are diagrams of examples of a system in accordance with an example embodiment implementing principles of the invention; and
[0020] FIG. 5 is a diagram of an example of the beam steering circuit of FIGS. 3 and 4.
DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS
[0021] FIG. 3 illustrates an example of a system 200. As shown, the system 200 is similar to system 100, except that transmitter 102 has been replaced with transmitter 202.
Transmitter 202 (similar to transmitter 102) employs direct conversion circuitry, but
superheterodyne circuitry can be employed as well. Transmitter 202-A, though, uses a phased array (which is generally comprised of beam steering circuit 204, phase rotators 206-1 to 206-N, and PAs 208-1 to 208-N) that operates in the millimeter wave or terahertz frequency range. An example of such a phased array system can be seen in U.S. Application No. 12/878,484, which is entitled "Terahertz Phased Array System," filed September 9, 2010, and which is hereby incorporated by reference. This arrangement allows for a beam of directed terahertz or millimeter wave energy to be directed to the receiver 104 or to receiver 203-A. Receiver 203-A is similar to receiver 104 except that includes LNAs 210-1 to 210-N, phase rotators 212-1 to 212-N and beam steering circuit 214, which allow the transmitter 202-A and receiver 203-A to point to one another. An example of a system that can employ this arrangement are U.S.
Application No. 13/226, 133, entitled "Wireless Router System," filed September 6, 2011, which is incorporated by reference herein. Additionally and alternatively, the modulator (mixers 106-1 and 106-2 and phase adjustment circuit 108-1) and demodulator (mixers 106-3 and 106-4 and phase adjustment circuit 108-2) of transmitter 202-A and receiver 203-B can be replaced by modulators 216-1 to 216-N and demodulators 218-1 to 218-N of transmitter 202-B and receiver 203-B, where the signals from local oscillators 110-1 and 110-2 being phase shifted by phase rotators 206-1 to 206-N and 212-1 to 212-N. The receiver 203-A/203-B may also have a phased array of a different size from transmitter 202-A/202-B.
[0022] The beam steering circuit 204 and/or 214 (which can be seen in greater detail in
FIG. 5) can then be advantageously used to compensate for carrier frequency offset between the local oscillators 110-1 and 110-2. Typically, the beam steering circuit 204 and/or 214 is implemented in hardware, but it can also be implemented (or have portions) implemented in software that is embodied on a processor (such as a digital signals processor or DSP). The beam steering circuit 204 and/or 214 is generally comprised of a phase controller 302 (which is able to independently control the phase rotators 206-1 to 206-N and/or 212-1 to 212-N so as to control the direction of the beam), a carrier frequency (CF) offset calculator 304, and an (optional) compensator 304. The CF offset calculator 304 is able to calculate the carrier frequency offset between the local oscillators 1 10-1 and 110-2 using conventional techniques that employ training sequences or otherwise. Specifically, the CF offset calculator 304 is able to calculate a difference AF. The received downconverted signal after the mixers 106-3 and 106-4 is proportional to:
(l) cos(27mT(AF)) , where T is the symbol period. Since encoded digital signals (i.e., 4-QAM) are transmitted, this adjustment can be applied at the phase rotators 206-1 to 206-N to the transmitted or received si nal on a per symbol basis to yield a phase shift for phase path (i) at symbol (n) of:
Figure imgf000007_0001
[0023] Because the same adjustment is applied to all phase rotators 206-1 to 206-N, the relative phase between the phase rotators 206-1 to 206-N remains constant so that the beam remains pointed in the desired direction. Thus, carrier frequency offset correction does not generally interfere with the functionality of the system 200. As indicated, the offset compensation can occur in receiver 203 or 104, the transmitter 202, or both; typically, offset compensation can occur in the receiver 203 or 104 can be performed if offset information is available at the receiver 203 or 104.
[0024] Those skilled in the art to which the invention relates will appreciate that modifications may be made to the described examples, and also that many other embodiments are possible, within the scope of the claimed invention.

Claims

CLAIMS What is claimed is:
1. An apparatus comprising:
a receiver having a first local oscillator signal with a first carrier frequency; and a transmitter having:
a second local oscillator signal with a second carrier frequency;
a signal generator that receives the second local oscillator signal; a phased array;
a plurality of phase rotators that are coupled between the signal generator and the phased array; and
a beam steering circuit that is coupled to each phase rotator, wherein the beam steering circuit calculates an offset cancellation for the offset between the first carrier frequency and the second carrier frequency, and wherein the beam steering circuit applies the offset cancellation to each phase rotator.
2. The apparatus of Claim 1, wherein the beam steering circuit further comprises:
a phase controller that is configured to control the phase of each phase rotator;
a carrier frequency offset calculator that is configured to calculate the offset cancellation; and
a compensator that is configured to apply the offset cancellation to the phase controller.
3. The apparatus of Claim 2, wherein the beam steering circuit is implemented as software embodied on a processor.
4. The apparatus of Claim 2, wherein the signal generator further comprises:
a signal source that generates in-phase (I) and quadrature (Q) signals;
a local oscillator that generates the second local oscillator signal;
a phase adjustment circuit is coupled to the local oscillator so as to receive the second local oscillator signal; a first mixer that is coupled to the signal source so as to receive the I signal and that is coupled to the phase adjustment circuit; and
a second mixer that is coupled to the signal source so as to receive the Q signal and that is coupled to the phase adjustment circuit.
5. The apparatus of Claim 4, wherein the phase adjustment circuit further comprises a hybrid.
6. The apparatus of Claim 5, wherein the signal source further comprises a baseband circuit.
7. The apparatus of Claim 6, wherein the phase rotators are adjusted on a per symbol basis.
8. A method comprising:
generating a baseband transmit signal having a plurality of data bits;
upconverting the baseband transmit signal to a radio frequency (RF) transmit signal using a first local oscillator signal having a first carrier frequency;
calculating an offset cancellation for the offset between the first carrier frequency and a second carrier frequency for a second local oscillator signal that is used to downconvert an RF receive signal;
applying the offset cancellation to a plurality of phase rotators; and
transmitting the RF transmit signal over a phased array.
9. The method of Claim 8, wherein the method further comprises adjusting the phase rotators on a per symbol basis.
10. The method of Claim 9, wherein the baseband transmit signal further comprises transmit I and Q signals.
11. The method of Claim 9, wherein the step of upconverting further comprises: generating first and second phases of the first local oscillator signal; and
mixing the I and Q signals with the first and second phases of the first oscillator signal, respectively.
12. An apparatus comprising:
a receiver having:
an antenna;
a low noise amplifier (LNA) that is coupled to the antenna; and
a demodulator that is coupled to the LNA and that demodulates an RF receive signal using a first local oscillator signal with a first carrier frequency; and
a transmitter having:
a second local oscillator signal with a second carrier frequency;
a signal generator that receives the second local oscillator signal;
a phased array;
a plurality of phase rotators that are coupled between the signal generator and the phased array; and
a beam steering circuit that is coupled to each phase rotator, wherein the beam steering circuit calculates an offset cancellation for the offset between the first carrier frequency and the second carrier frequency, and wherein the beam steering circuit applies the offset cancellation to each phase rotator.
13. The apparatus of Claim 12, wherein the beam steering circuit further comprises:
a phase controller that is configured to control the phase of each phase rotator;
a carrier frequency offset calculator that is configured to calculate the offset cancellation; and
a compensator that is configured to apply the offset cancellation to the phase controller.
14. The apparatus of Claim 13, wherein the beam steering circuit is implemented as software embodied on a processor.
15. The apparatus of Claim 13, wherein the signal generator further comprises: a signal source that generates I and Q signals;
a local oscillator that generates the second local oscillator signal;
a phase adjustment circuit is coupled to the local oscillator so as to receive the second local oscillator signal;
a first mixer that is coupled to the signal source so as to receive the I signal and that is coupled to the phase adjustment circuit; and
a second mixer that is coupled to the signal source so as to receive the Q signal and that is coupled to the phase adjustment circuit.
16. The apparatus of Claim 15, wherein the phase adjustment circuit further comprises a hybrid.
17. The apparatus of Claim 16, wherein the signal source further comprises a baseband circuit.
18. The apparatus of Claim 17, wherein the phase rotators are adjusted on a per symbol basis.
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US8736481B2 (en) * 2011-10-28 2014-05-27 Texas Instruments Incorporated Carrier frequency offset compensation in beamforming systems
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CN106027136A (en) * 2016-05-07 2016-10-12 上海大学 Non-digital-signal-processing amplifying and forwarding repeater and relay method
WO2018039766A1 (en) * 2016-08-29 2018-03-08 Beam Semiconductor Ltd. Antenna modules and systems, and applications and methods of manufacturing thereof
US10735838B2 (en) 2016-11-14 2020-08-04 Corning Optical Communications LLC Transparent wireless bridges for optical fiber-wireless networks and related methods and systems
WO2019161101A1 (en) * 2018-02-15 2019-08-22 Space Exploration Technologies Corp. Antenna aperture in phased array antenna systems
US12562765B2 (en) * 2022-12-21 2026-02-24 Qualcomm Incorporated Spur suppression for millimeter wave (mmW) receiver
US12323153B2 (en) * 2023-06-16 2025-06-03 Cypress Semiconductor Corporation Wireless per-frame-based local oscillator trimming for uplink multi-user transmission

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020154687A1 (en) * 2001-02-28 2002-10-24 Scott Bierly Integrated beamformer/modem architecture
US20040048580A1 (en) * 2001-06-21 2004-03-11 Tim Lunn Base transceiver station
US20070205943A1 (en) * 2006-02-14 2007-09-06 Karim Nassiri-Toussi Adaptive beam-steering methods to maximize wireless link budget and reduce delay-spread using multiple transmit and receive antennas
US20110063169A1 (en) * 2009-09-13 2011-03-17 International Business Machines Corporation Phased-array transceiver for millimeter-wave frequencies

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4166274A (en) 1978-06-02 1979-08-28 Bell Telephone Laboratories, Incorporated Techniques for cophasing elements of a phased antenna array
US4281412A (en) * 1979-07-05 1981-07-28 Cincinnati Electronics Corporation Method of and apparatus for transmitting and recovering offset QPSK modulated data
US4468788A (en) * 1982-09-13 1984-08-28 The Bendix Corporation Digital frequency translator for offset frequency generation of unmodulated signals
US4501002A (en) * 1983-02-28 1985-02-19 Auchterlonie Richard C Offset QPSK demodulator and receiver
US5287388A (en) * 1991-06-25 1994-02-15 Kabushiki Kaisha Toshiba Frequency offset removal method and apparatus
US5422917A (en) * 1993-01-04 1995-06-06 Novatel Communications Ltd. Frequency offset estimation using the phase rotation of channel estimates
US5400363A (en) * 1993-05-07 1995-03-21 Loral Aerospace Corp. Quadrature compensation for orthogonal signal channels
JPH10336149A (en) * 1997-05-28 1998-12-18 Matsushita Electric Ind Co Ltd Array antenna wireless CDMA communication device
JP2001285165A (en) * 2000-04-03 2001-10-12 Sanyo Electric Co Ltd Radio equipment
US7200188B2 (en) * 2003-01-27 2007-04-03 Analog Devices, Inc. Method and apparatus for frequency offset compensation
US8064528B2 (en) * 2003-05-21 2011-11-22 Regents Of The University Of Minnesota Estimating frequency-offsets and multi-antenna channels in MIMO OFDM systems
JP4183592B2 (en) * 2003-09-26 2008-11-19 三洋電機株式会社 Receiving method and apparatus
US20070160168A1 (en) * 2006-01-11 2007-07-12 Beukema Troy J Apparatus and method for signal phase control in an integrated radio circuit
CN101455008B (en) * 2006-04-03 2012-10-24 伟俄内克斯研究公司 Frequency Offset Correction for UWB Communication System
US8831073B2 (en) * 2009-08-31 2014-09-09 Sony Corporation Wireless transmission system, wireless communication device, and wireless communication method
US8416759B1 (en) * 2010-07-30 2013-04-09 Applied Micro Circuits Corporations Carrier frequency offset and doppler frequency estimation and correction for OFDMA and SC-FDMA
JP5842143B2 (en) * 2010-09-02 2016-01-13 パナソニックＩｐマネジメント株式会社 Radar equipment
US8736481B2 (en) * 2011-10-28 2014-05-27 Texas Instruments Incorporated Carrier frequency offset compensation in beamforming systems

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020154687A1 (en) * 2001-02-28 2002-10-24 Scott Bierly Integrated beamformer/modem architecture
US20040048580A1 (en) * 2001-06-21 2004-03-11 Tim Lunn Base transceiver station
US20070205943A1 (en) * 2006-02-14 2007-09-06 Karim Nassiri-Toussi Adaptive beam-steering methods to maximize wireless link budget and reduce delay-spread using multiple transmit and receive antennas
US20110063169A1 (en) * 2009-09-13 2011-03-17 International Business Machines Corporation Phased-array transceiver for millimeter-wave frequencies

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12046829B2 (en) 2019-02-12 2024-07-23 Nokia Solutions And Networks Oy Method and system for self-alignment of signals in large-scale phased array systems

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