关键词: 空频编码, 正交频分复用, 串行迭代线性最小均方误差估计, 符号检测器

Abstract:

Two high performance detectors were proposed. Both are sequential iterative detectors using linear minimum mean squared error (LMMSE) estimation. In the first detector, the finite alphabet property of modulated symbols was used. During the process of iteration, the prior information was also updated through posteriori probability calculations. In the second one, the decision feedback was used. Analysis and simulations demonstrated that compared to the existing interference cancellation method, and the proposed algorithms can effectively eliminate the error floor of space-frequency orthogonal frequency division multiplexing (OFDM) system over frequency selective multipath channels with affordable implementation complexity.

Key words: space-frequency code, orthogonal frequency division multiplexing , sequential iterative linear minimum mean squared error estimation, symbol detector