Space-iteration channel estimation and detection joint algorithm
基于空间迭代的信道估计和译码联合算法*

To improve the detection performance under imperfect channel information, this distribution put forward a channel estimation and detection joint algorithm based on SAGE, the detail was: divided the received frame was into a few blocks, the first block was pilot block and provide the channel information for detection of the second block; then detected symbols in the second block in turn; when the second block finished detection, used the channel information of this block for the detection of next block, and detected repeat those processes until all blocks. Simulation results show SAGE algorithm has better performance than ML detection+ LMMSE channel estimation algorithm, and lower calculation complexity and quicker astringency than EM algorithm. SAGE algorithm can update instantly channel information based on detection results of the previous block and quick astringency under inaccurate channel information, and achieve good and robust performance.