一种多元位置随机极性连续相位调制解调器

An M-ary and continuous phase modem with random-polar

为改善随机极性的连续相位扩展二元相移键控(CP-EBPSK)调制信号的频谱结构,提出了一种带功率谱形状调节系数的多元位置随机极性的修正连续相位扩展二元相移键控(MCP-EBPSK)调制解调方式。阐述了多元位置随机极性MCP-EBPSK调制原理和基于数字冲击滤波器多路判决的解调器模型,对比和分析了随机极性CP-EBPSK调制、多进制的随机极性CP-EBPSK调制和新调制方式的功率谱、-60dB带宽、频谱利用率和解调性能。仿真结果表明:新的调制方式不但能使频谱利用率成倍提高,而且可以通过选择合适的功率谱形状调节系数来获得更好的解调性能。

In order to improve the spectrum structure of random-polar modulated Extended Binary Phase Shift Keying with Continuous Phase （CP-EBPSK）, a random-polar and M-ary modified CP-EBPSK （MCP-EBPSK） modulation with the adjustable coefficient of spectrum shape is proposed. The principle of random-polar and M-ary MCP-EBPSK is demonstrated, and the demodulator model based on mutt-discrimination of digital impacting filter is also presented. The contrast and analysis of the power spectrum, the -60 dB bandwidth, the spectral efficiency, and the demodulation performance among the random-polar modulated CP-EBPSK, the random-polar modulated M-ary CP-EBPSK, and the proposed modulation, are carried out. Simulation results show that the proposed method not only multiplies the spectral efficiency, but also can get better demodulation performance by selecting the appropriate adjustment coefficient of spectrum shape.