Telecommunications – Receiver or analog modulated signal frequency converter – With wave collector
Reexamination Certificate
2002-06-19
2004-02-03
Chin, Vivian (Department: 2682)
Telecommunications
Receiver or analog modulated signal frequency converter
With wave collector
C455S063100, C455S063400, C455S069000, C455S114200, C455S067110, C455S067160, C455S129000
Reexamination Certificate
active
06687492
ABSTRACT:
RELATED APPLICATIONS
This application is related to commonly assigned and U.S. Non-Provisional application No. 10/174,689, filed on even date and entitled “SYSTEM AND METHOD FOR ANTENNA DIVERSITY USING EQUAL POWER JOINT MAXIMAL RATIO COMBINING.”
BACKGROUND OF THE INVENTION
The present invention is directed to antenna (spatial) signal processing useful in wireless communication applications, such as short-range wireless applications.
Antenna diversity schemes are well known techniques to improve the performance of radio frequency (RF) communication between two RF devices. Types of antenna diversity schemes include antenna selection diversity and maximal ratio combining. An antenna selection diversity scheme selects one of two antennas for transmission to a particular communication device based on which of the two antennas best received a signal from the particular communication device. On the other hand, maximal ratio combining schemes involve beamforming a signal to be transmitted by two or more antennas by scaling the signal with an antenna weight associated with each antenna. A signal received by a plurality of antennas can also be weighted by a plurality of receive antenna weights. Selection of the antenna weights to optimize communication between two communication devices is critical to the performance of maximal ratio combining schemes.
There is room for improving the maximal ratio combining antenna processing schemes to optimize the link margin between two RF communication devices.
SUMMARY OF THE INVENTION
An antenna signal processing scheme, hereinafter called composite beamforming (CBF), is provided to optimize the range and performance RF communication between two communication devices. Composite beamforming (CBF) is a multiple-input multiple-output (MIMO) antenna scheme that uses antenna signal processing at both ends of the communication link to maximize the signal-to-noise (SNR) and/or signal-to-noise-plus-interference (SNIR), thereby improving the link margin between two communication devices, as well as to provide for other advantages described herein.
Generally, a first communication device has a plurality of antennas and the second communication has a plurality of antennas. The first communication device transmits to the second communication device using a transmit weight vector for transmission by each the plurality of antennas and the transmit signals are received by the plurality of antennas at the second communication device. The second communication device determines the receive weight vector for its antennas, and from that vector, derives a suitable transmit weight vector for transmission on the plurality of antennas back to the first communication device. Several techniques are provided to determine the optimum frequency dependent transmit weight vector and receive weight vector across the bandwidth of a baseband signal transmitted between the first and second communication devices so that there is effectively joint or composite beamforming between the communication devices. The link margin between communication devices is greatly improved using the techniques described herein.
With the same antenna configuration, 2-antenna CBF (2-CBF) provides an SNR improvement of up to 10 dB over transmit/selection diversity when it is used at both ends of the link. A system design using 4 antennas at a first communication device and 2 antennas at a second communication device (hereinafter referred to as 4×2 CBF) provides nearly 14 dB of SNR improvement. In general, for a fixed number of antennas, CBF outperforms the well-known space-time block codes by up to 4 dB. Moreover, unlike space-time coding, CBF does not require a change to an existing wireless standard.
REFERENCES:
patent: 4599734 (1986-07-01), Yamamoto
patent: 4639914 (1987-01-01), Winters
patent: 5274844 (1993-12-01), Harrison et al.
patent: 5394435 (1995-02-01), Weerackody
patent: 5437055 (1995-07-01), Wheatley, III
patent: 5491723 (1996-02-01), Diepstraten
patent: 5507035 (1996-04-01), Bantz et al.
patent: 5577265 (1996-11-01), Wheatley, III
patent: 5610617 (1997-03-01), Gans et al.
patent: 5982327 (1999-11-01), Vook et al.
patent: 6008760 (1999-12-01), Shattil
patent: 6037898 (2000-03-01), Parish et al.
patent: 6038272 (2000-03-01), Golden
patent: 6044120 (2000-03-01), Bar-David et al.
patent: 6058105 (2000-05-01), Hochwald et al.
patent: 6097771 (2000-08-01), Foschini
patent: 6122260 (2000-09-01), Liuu et al.
patent: 6124824 (2000-09-01), Xu et al.
patent: 6144711 (2000-11-01), Raleigh et al.
patent: 6147985 (2000-11-01), Bar-David et al.
patent: 6157340 (2000-12-01), Xu et al.
patent: 6177906 (2001-01-01), Petrus
patent: 6195045 (2001-02-01), Xu et al.
patent: 6211671 (2001-04-01), Shattil
patent: 6252548 (2001-06-01), Jeon
patent: 6298092 (2001-10-01), Heath, Jr.
patent: 6307882 (2001-10-01), Marzetta
patent: 6317466 (2001-11-01), Foschini et al.
patent: 6327310 (2001-12-01), Hochwald et al.
patent: 6331837 (2001-12-01), Shattil
patent: 6349219 (2002-02-01), Hochwald et al.
patent: 6351499 (2002-02-01), Paulraj et al.
patent: 6362781 (2002-03-01), Thomas et al.
patent: 6369758 (2002-04-01), Zhang
patent: 6370182 (2002-04-01), Bierly et al.
patent: 6377631 (2002-04-01), Raleigh
patent: 6377636 (2002-04-01), Paulraj et al.
patent: 6377819 (2002-04-01), Gesbert et al.
patent: 6400699 (2002-06-01), Airy et al.
patent: 6400780 (2002-06-01), Rashid-Farrokhi et al.
patent: 6442214 (2002-08-01), Boleskei et al.
patent: 2001/0012764 (2001-08-01), Edwards et al.
patent: 2001/0015994 (2001-08-01), Nam
patent: 2001/0046255 (2001-11-01), Shattil
patent: 2001/0053143 (2001-12-01), Li et al.
patent: 2002/0001316 (2002-01-01), Hornsby et al.
patent: 2002/0024975 (2002-02-01), Hendler
patent: 2002/0034191 (2002-03-01), Shattil
patent: 2002/0039884 (2002-04-01), Raynes et al.
patent: 2002/0064246 (2002-05-01), Kelkar et al.
patent: 2002/0067309 (2002-06-01), Baker et al.
patent: 2002/0072392 (2002-06-01), Awater et al.
patent: 2002/0085643 (2002-07-01), Kitchener et al.
patent: 2002/0102950 (2002-08-01), Gore et al.
patent: 2002/0111142 (2002-08-01), Klimovitch
patent: 2002/0118781 (2002-08-01), Thomas et al.
patent: 2002/0122383 (2002-09-01), Wu et al.
patent: 2002/0122501 (2002-09-01), Awater et al.
patent: 2002/0127978 (2002-09-01), Khatri
patent: 2002/0136170 (2002-09-01), Struhsaker
patent: 2002/0141355 (2002-10-01), Struhsaker et al.
patent: 2002/0158801 (2002-10-01), Crilly, Jr. et al.
patent: 2002/0159537 (2002-10-01), Crilly, Jr.
patent: 2002/0172269 (2002-11-01), Xu
patent: 2002/0196842 (2002-12-01), Onggosanusi et al.
patent: 2003/0002450 (2003-01-01), Jalali et al.
patent: 2003/0032423 (2003-02-01), Boros et al.
patent: 2003/0108117 (2003-06-01), Ketchum et al.
patent: 2003/0125090 (2003-07-01), Zeira
patent: 2003/0139194 (2003-07-01), Onggosanusi et al.
patent: WO 02/03568 (2002-01-01), None
patent: WO 01/45300 (2002-06-01), None
Bablan et al., “Optimum Diversity Combining and Equalization in Digital Data Transmission with Applications to Cellular Mobile Radio-PartII: Numerical Results”, May 1992, IEEE Transactions on Communications, vol. 30, No. 5, pp. 895-907.
Chuah et al., “Capacity of Multi-Antenna Array Systems in Indoor Wireless Environment”, Nov. 1998, IEEE Globecom.
Wallace et al., “Experimental Characterization of the MIMO Wireless Channel: Data Acquisition and Analysis”, Feb. 27, 2002, Department of Electrical and Computer Engineering, Brigham Young University.
Love et al., “Equal Gain Transmission in Multiple-Input Multiple-Output Wireless Systems”, Nov. 2002, Proceedings of IEEE Globecom, pp. 1124-1128.
Vaidyanathan et al., “The Role of Lossless Systems in Modern Digital Signal Processing: A Tutorial,” IEEE Transactions on Education, vol. 32, Aug. 1989, pp. 181-197.
Raleigh et al., “Spatio-Temporal Coding for Wireless Communication,” IEEE Transactions on Communications, vol. 46., No. 3, Mar. 1998, pp. 357-366.
Jungnickel et al., “Performance of a MIMO System with Overlay Pilots,” IEEE GlobeCom 2001, pp. 594-598.
BLAST High-Level Overview, Lucent Technologies, Jul. 18, 2000.
Golden et
Sugar Gary L.
Tesfai Yohannes
Vaidyanathan Chandra
Chin Vivian
Cognio, Inc.
Floam, Esq, D. Andrew
Persino Raymond B
LandOfFree
System and method for antenna diversity using joint maximal... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System and method for antenna diversity using joint maximal..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and method for antenna diversity using joint maximal... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3296373