Adaptive time diversity and spatial diversity for ofdm

Details Adaptive time diversity and spatial diversity for ofdm Adaptive time diversity and spatial diversity for ofdm

H - Electricity

04

J

H04J 11/00 (2006.01) H04B 7/02 (2006.01) H04B 7/06 (2006.01) H04L 1/06 (2006.01) H04L 25/02 (2006.01) H04L 27/26 (2006.01) H04B 7/08 (2006.01)

Patent

CA 2351140

An adaptable orthogonal frequency-division multiplexing system (OFDM) that uses a multiple input multiple output (MIMO) to having OFDM signals transmitted either in accordance with time diversity to reducing signal fading or in accordance with spatial diversity to increase the data rate. Sub-carriers are classified for spatial diversity transmission or for time diversity transmission based on the result of a comparison between threshold values and at least one of three criteria. The criteria includes a calculation of a smallest eigen value of a frequency channel response matrix and a smallest element of a diagonal of the matrix and a ratio of the largest and smallest eigen values of the matrix.

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