this paper is mainly considered : 1 ) how joint coded modulation transmitter is designed based on the iterative decoder . 2 ) the combination of ldpc code with bit-interleaved coded modulaton . 3 ) the optimization of two dimensional signal constellations in joint coded modulation with iterative decoder 本文研究工作的重点在于:1)迭代译码对联合编码调制方案设计的影响;2)新的纠错编码和比特交织编码调制的有机结合;3)高阶星座的最优化问题。