CPM调制的迭代检测技术

Iterative Detection of CPM

CPM信号具有包络恒定、峰均比小、功率利用率高的优点。针对CPM信号的特征,比较了最大似然序列检测Viterbi算法和逐符号的最大后验概率(MAP)解调算法的特点,重点研究了使用迭代检测技术进行软输入输出解调及译码的MAP解调方法。在AWGN信道条件下对CPM全响应和部分响应信号进行了误码性能仿真,结果表明采用相干解调和译码,迭代检测方案可得到较高的编码增益。

CPM modulation features constant envelope, small PAPR and high power efficiency. Based on the principle of CPM, a comparison is made between the characteristics of the maximum likelihood sequence detection viterbi algorithm and symbol-by-symbol maximum a posteriori probability （MAP） demodulation algorithm, and the MAP algorithm using iterative detection techniques for SISO demodulation and decoding is particularly introduced. Simulation of Full-Response and Partial-Response CPM signals over an additive white Gaussian noise （AWGN） channel is conducted. The results show that a high coding gain of iterative detection can be achieved by using coherent demodulation and decoding.