Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Reexamination Certificate
2005-09-21
2009-12-08
Rao, Seema S (Department: 2416)
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
C455S067110, C455S069000, C455S513000, C455S562100, C375S267000
Reexamination Certificate
active
07630337
ABSTRACT:
Certain embodiments of the invention may be found in a method and system for an improved user group selection scheme with finite-rate channel state information feedback for frequency division duplex (FDD) multiuser multiple-input-multiple-output (MIMO) downlink transmission. Aspects of the method may include selecting, from a plurality of users in a FDD multiuser communication system, a first user having a channel gain that is greater than a channel gain corresponding to a remaining portion of the plurality of users. A second user may be selected from the remaining portion of the plurality of users, based on a channel gain of the second user and orthogonality of the second user's channel direction with respect to the first user. The selected second user may have a channel gain that is greater than a channel gain corresponding to the remaining portion of the plurality of users.
REFERENCES:
patent: 6728307 (2004-04-01), Derryberry et al.
patent: 7403748 (2008-07-01), Keskitalo et al.
patent: 2004/0233871 (2004-11-01), Seki et al.
patent: 2005/0190868 (2005-09-01), Khandekar et al.
patent: 2005/0265223 (2005-12-01), Song
patent: 2006/0203794 (2006-09-01), Sampath et al.
E. Telatar, “Capacity of multi-antenna gaussian channels,”Bell Labs Technical Journal, Jun. 1995, pp. 1-28.
G. J. Foschini, “Layered space-time architecture for wireless communication in a fading environment when using multiple antennas,”Bell Labs Technical Journal, vol. 1, No. 2, pp. 41-59, 1996.
S. Caire, G. Shamai, “On the achievable throughput of a multiantenna gaussian broadcast channel,”IEEE Trans. On Information Theory, vol. 49, No. 7, pp. 1691-1706, 2003.
V. Tarokh, H. Jafarkhani, and A. R. Calderbank, “Space-time block codes from orthogonal designs,”IEEE Trans. On Information Theory, vol. 45, pp. 1456-1467, Jul. 1999.
K. N. Lau, Y. Liu, and T. A. Chen, “On the design of MIMO block-fading channels with feedback-link capacity constraint,” IEEE Trans. on Communications, vol. 52, No. 1, pp. 62-70, Jan. 2004.
D. J. Love, R. W. Heath, Jr., and T. Strohmer, “Grassmannian beamforming for multiple-input multiple-output wireless systems,”IEEE Trans. on Information Theory, vol. 49, pp. 2735-2747, Oct. 2003.
J. C. Roh and B. D. Rao, “Design and analysis of MIMO spatial multiplexing systems with quantized feedback,”submitted to IEEE Trans. on Signal Processing, pp. 1-30, 2005.
P. Xia and G. B. Giannakis, “Design and analysis of transmit-beamforming based on limited-rate feedback,”IEEE Trans. on Signal Processing, pp. 1-26., 2005 (to appear).
R. Knopp and P. A. Humblet, “Information capacity and power control in single-cell multiuser communications,” inIEEE International Conference on Communications 1995, vol. 1, Seattle, pp. 331-335, 1995.
D. Gesbert and M. S. Alouini, “How much feedback is multi-user diversity really worth?” inIEEE International Conference on Communications 2004, vol. 1, pp. 234-238, 2004.
S. Sanayei and A. Nosratinia, “Exploiting multiuser diversity with only 1-bit feedback,” inIEEE Wireless Communications and Networking Conference 2005, vol. 2, Seattle, pp. 978-983, 2005.
T. Yoo and A. J. Goldsmith, “Optimality of zero-forcing beamforming with multiuser diversity,” in2005 IEEE International Conference on Communications, Seoul, Korea, pp. 542-546, May 2005.
C. B. Peel, B. M. Hochwald, and A. L. Swindlehurst, “A vector-perturbation technique for near-capacity multiantenna nultiuser communication—Part I: channel inversion and regularization,”IEEE Trans. on Communications, vol. 53, No. 1, pp. 195-202, Jan. 2005.
C. Windpassinger, R. F. H. Fischer, T. Vencel, and J. B. Huber, “Precoding in multiantenna and multiuser communications,”IEEE Trans. on Wireless Communications, vol. 3, No. 4, pp. 1305-1316, 2004.
B. M. Hochwald, C. B. Peel, and A. L. Swindlehurst, “A vector-perturbation technique for near-capacity multiantenna multiuser communication—Part II: perturbation,”IEEE Trans. on Communications, vol. 53, No. 3, pp. 537-544, Mar. 2005.
J. C. Roh and B. D. Rao, “Transmit beamforming in multiple antenna systems with finite rate deedback: A VQ-based approach,”submitted to IEEE Trans. on Information Theory, pp. 1-29, 2004.
T. K. Y. Lo, “Maximum ratio transmission,”IEEE Trans. on Communications, vol. 47, No. 10, pp. 1458-1461, Oct. 1999.
Rooyen Pieter van
Zhang Chengjin
Zheng Jun
Broadcom Corporation
McAndrews Held & Malloy Ltd.
Rao Seema S
Russell Wanda Z
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