Patent ID: 8184734

Claim:
A method for transmitting data in a wireless communication system, the method comprising: encoding input data to output a codeword; modulating the codeword to output a modulated symbol stream; mapping each symbol of the modulated symbol stream to one or more rows of an input vector to a precoder based on a specific spatial multiplexing rate; precoding the input vector to the precoder to output a precoded vector using a phase-shift-based precoding matrix of: P N t × R k = ( ⅇ j ⁢ ⁢ θ 1 ⁢ k 0 … 0 0 ⅇ j ⁢ ⁢ θ 2 ⁢ k … 0 ⋮ ⋮ ⋱ 0 0 0 … ⅇ j ⁢ ⁢ θ N t ⁢ k ) ⁢ U N t × R , wherein P N t ×R k is the phase-shift-based precoding matrix for a k th subcarrier in a multi-antenna system with the spatial multiplexing rate of R and N t transmitting antennas, U N t ×R is a unitary matrix that satisfies “U N t ×R H ×U N t ×R =I R×R ”; and transmitting symbols of the precoded vector to a receiving end.