Channel aware optimal space-time signaling for wireless...

Details Channel aware optimal space-time signaling for wireless... Channel aware optimal space-time signaling for wireless...

2006-09-19

2006-09-19

Vu, Huy D. (Department: 2616)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

Reexamination Certificate

active

07110378

ABSTRACT:
A method and system is described for more optimally managing the usage of a wideband space-time multipath channel. The wideband space-time multipath channel is decomposed into a plurality of orthogonal sub-channels, where the orthogonal sub-channels having the best signaling characteristics are used for transmitting one or more signal streams. For purposes of decomposing the wideband space-time multipath channel into a plurality of orthogonal sub-channels, channel estimates are determined for each signal propagation path. A closed-form singular value decomposition of the channel corresponding to each receive antenna before coherent combining is utilized to obtain an orthogonal decomposition of the overall effective space-time channel after coherent combining. By using the overall effective space-time channel after coherent combining rather than before coherent combining, the complexity and correspondingly the resources required for obtaining the orthogonal sub-channels is significantly reduced. The method and system further provide for transmit power to be allocated between the selected sub-channels in order to minimize the effective bit-error rate for a fixed average throughput or to maximize average throughput for a fixed minimum effective bit-error rate.

REFERENCES:
patent: 6101176 (2000-08-01), Honkasalo et al.
patent: 6351499 (2002-02-01), Paulraj et al.
patent: 6643526 (2003-11-01), Katz
patent: 6775233 (2004-08-01), Kumaran et al.
patent: 2003/0139186 (2003-07-01), Igarashi et al.

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