联合迭代均衡译码算法

Joint iterative equalization decoding algorithm

为了提高迭代分组判决反馈均衡器(IBDFE)的判决可靠性,引入低密度奇偶校验码(LDPC)对其加以改进。将均衡输出的信号经判决后送入LDPC译码器,译码后的值经数字调制再反馈给IBDFE,译码器与均衡器间充分交换信息进行联合迭代均衡译码。在水声多径情况下的仿真结果显示,改进算法在误码率为10-3时会比原算法有2dB的增益。

Low density parity check （LDPC） codes are introduced to improve the decision reliability of the iterative block decision feedback equalizer （IBDFE）. The balanced outputs signal is sent to the LDPC decoder after the judgement, and then feedback to IBDFE by digital modulation, thus, the decoder and the equalizer can make full exchange of information for joint iterative equalization decoding. Simulation results in underwater acoustic multipath show that, the improved algorithm has 2 dB gain compared with the original algorithm when the bit error rate is 10-3.