Transmit diversity gain for wireless communications networks

Details Transmit diversity gain for wireless communications networks Transmit diversity gain for wireless communications networks

2006-05-02

2006-05-02

Vuong, Quochien B. (Department: 2685)

Telecommunications

Transmitter

Diversity

C455S562100, C375S299000

Reexamination Certificate

active

07039369

ABSTRACT:
A method and system that increases transmit diversity gain in a wireless communication system. The system includes a transmitter with 2Ntransmit antennas, where N is greater than one, and a receiver with one or more receive antenna. The transmitter includes N stages connected serially to each other. The first stage is a symbol level space-time transmit diversity encoder. Each of the next N−1 stages is a block level space-time transmit diversity encoder, for a total of N stages. The last stage is connected to the 2Nantennas. The transmitter generates pairs of symbols in a form X1and X2, The pairs of symbols are encoded by the first stage to produce a 21×21output matrix C. Then, in each next block level stage n, the 2n−1×2n−1output matrix of a previous stage is encoded to a 2n×2noutput matrix, until a final output matrix has 2Nrows of transmit symbols. The transmit symbols of the final output matrix are fed, in a left-to-right order, for each row, in a top-to-bottom order, to a corresponding different one of the 2Ntransmit antennas. A transmit weight is applied to each transmit symbol before transmitting the transmit symbol.

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S. Zhou, G.B. Giannakis, “Optimal transmitter eigen-beamforming and space-time block coding based on channel mean feedback,” IEEE Trans. Signal Processing, vol. 50, pp. 2599-2613, Oct., 2002.
3GPP Standard document, TR 25.869, “Transmitter diversity solutions for multiple antennas.”
J.H. Horng, L. Li, and J. Zhang, “Adaptive space-time transmit diversity for MIMO systems,” In Proc. IEEE Veh. Techno. Conf. VTC '03 Spring, pp. 1070-1073, Apr. 2003.
Valaee, et al., “Resource Allocation for Video Streaming in Wireless Environment,” IEEE International Symposium on Wireless Personal Multimedia Communications (WPMC 02), Oct. 2002.

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