Patent ID: 8982997
Filing Date: 2015-03-17
Classification: H04B,H04L

Abstract:
1. A method of transmitting a data stream from a transmitter in a multiple-input-multiple-output (MIMO) wireless communication system, said transmitter comprising a plurality of transmit antennas, said method comprising: applying a discrete Fourier transform (DFT) to said data stream to generate a plurality of symbol sequences; pairing symbols of a first symbol sequence from said plurality of symbol sequences with symbols of a second symbol sequence from said plurality of symbol sequences to generate a plurality of symbol pairs, wherein said pairing results in an orphan symbol; applying a space-time block code (STBC) to said symbol pairs to generate a plurality of sets of STBC symbols, each set of STBC symbols being associated with a corresponding one of said plurality of antennas; applying a cyclic delay diversity (CDD) operation to said orphan symbol to generate a plurality of CDD symbols, each CDD symbol being associated with a corresponding one of said plurality of antennas; transmitting from each one of said antennas said corresponding set of STBC symbols and said corresponding CDD symbol; and transmitting, when said plurality of transmit antennas comprises two transmit antennas, from each one of said two transmit antennas two reference signals per slot, with both of said two antennas using one orthogonal sequence per slot, wherein a first one of said reference signals separates said transmitter, and a second one of said reference signals separates a corresponding one of said two antennas.