Patent ID: 7564916
Filing Date: 2009-07-21
Classification: H04L

Abstract:
1. A method for encoding message with space-time trellis code (STTC) and transmitting the encoded message in a communication system employing at least two transmit antennas and at least one receive antenna, comprising steps of: generating a codeword X by encoding a message using STTC; and multiplying the codeword X by a weighting matrix W, and then transmitting it through the transmit antenna, wherein, the signal received at the receive antenna is given in equation 3: wherein, X is a 2×l matrix of a codeword, W is a 2×2 weighting matrix, H is an m×2 matrix of channel coefficients, N is an m×l matrix of additive noise, Es is energy per symbol, and Y is an m×l matrix of received signals at the receive antenna; wherein, the weighting matrix W is chosen as W wherein, ω is a positive real number such that 0.5≦ω h wherein, conditional pairwise error probability (PEP) for the channel coefficient H is given in equation 6: wherein, ρ=Es/4N where N A k is 1 for |h since A the unitary matrix U=unit(r,θ1, θ2, θ3) is given as following equation 7: wherein, r is a real number such that 0≦r≦1, and −π≦θ1, θ2, θ3≦π; and wherein, from the following equation 8 regarding conditional PEP for {|h r value is chosen such that |r ω=1 is chosen so that the absolute value of ξ is minimized: wherein, I