An interference cancellation method based on space-time code over X channel
An interference cancellation method based on space-time code is proposed for X channel with four antennas at each user. Each user employs full-rate full-diversity space-time block code. The unwanted codewords are eliminated through the introduction of zero elements into each codeword. The wanted codewords from two users keep orthogonal through the pre-coding at each user, so the interference between wanted codewords is cancelled. Compared with the existing scheme for the same scene, our proposed scheme greatly reduces feedback amount, while keeping the same transmission efficiency. Simulation results demonstrate the validity of the proposed scheme.