基于SVM判决的RS编码EBPSK调制解调器

冲击滤波器能将扩展的二元相移键控（extended binary phase shift keying, EBPSK）调制信号的相位跳变转化为幅度冲击，从而突出了“0”和“1”码元的波形差异. 为了充分利用该特性，文中设计了基于支持向量机（support vector machine, SVM）判决的RS编码EBPSK调制解调器. 简述了EBPSK调制解调原理，并
利用SVM的分类能力给出了EBPSK检测模型. 对二元相移键控BPSK和EBPSK的性能进行对比，设计了基于SVM的RS编码EBPSK调制解调器. 仿真结果表明：1) 以比特每秒/赫兹/信噪比为综合指标，EBPSK系统性能优于BPSK；2) 在AWGN信道下，当误码率为10−4时与自适应门限判决的RS编码EBPSK调制解调器相比，基于SVM的调制解调器可获得约1 dB的编码增益.

RS Coded EBPSK-MODEM Based on SVM Discrimination

Impacting filter can change phase jump of the extended binary phase shift keying (EBPSK) signal into magnitude impact so as to enlarge the difference between waveforms of 0 and 1. To take full advantage of the special filtering mechanism, we design an RS coded EBPSK-MODEM based on the support vector machine (SVM) discrimination. After briefly describing the principle of EBPSK modem, an EBPSK detector model based on SVM is proposed, which uses the classification ability of SVM. Performances of binary phase shift keying (BPSK) and EBPSK are compared, and an RS coded EBPSK modem based on SVM is designed. Simulation results show that, taking bit·s−1/Hz/SNR as an aggregate indicator, EBPSK system outperforms BPSK, and, compared with the RS coded EBPSK modem based on adaptive threshold decision, the proposed SVM-based method can obtain about 1 dB coding gain in AWGN channel at BER of 10−4.