Patent ID: 7801237
Filing Date: 2010-09-21
Classification: H04L

Abstract:
1. A transmitter in a communication system using three transmit antennas, comprising: a pre-coder for pre-coding an input symbol sequence by multiplying the input symbol sequence by e a re-combiner for generating symbol vectors by grouping the real and imaginary parts of the pre-coded symbol sequence by twos in interleaving scheme; and one of a Space-Time frequency Block Code (STFBC) or Space-Time Block Code (STBC) coder for transmitting the each recombined symbol vectors through corresponding antennas by Alamouti coding, wherein θ is a phase rotation angle in a range of 0≦θpi|2, and wherein, in the case of Quadrature Phase Shift Keying (QPSK), θ is one of atan(⅓) or pi/2-atan(⅓), in the case of 16 Quadrature Amplitude Modulation (QAM), θ is one of atan(¼) or pi/2-atan(¼), and in the case of 64QAM, θ is one of atan( 1/18) or pi/2-atan( 1/18).