Patent ID: 8126077

Claim:
In a base station that uses a number of antennas for multiple-input multiple output (MIMO) transmission of orthogonal frequency division multiplexed (OFDM) symbols through a channel, a method for transmitting comprising: for the number of antennas, distributing quadrature-amplitude modulated (QAM) symbols across a group of OFDM tones of a block comprising the group of tones and a group of OFDM symbols; applying an incremented cyclic delay to the QAM symbols of the block associated with each subsequent of the antennas for a cyclic-delay diversity (CDD) transmission; and providing the blocks for transmission by an associated one of the antennas, wherein the cyclic delay is a cyclic tone shift between the antennas that is based on a spatial correlation of the channel, and wherein a greater cyclic tone shift is used for greater spatial correlations.