选择式频率分集SFH／MFSK系统在短波信道中的性能

选择式频率分集SFH／MFSK系统在短波信道中的性能 PERFORMANCE OF SELECTIVE FREQUENCY SFH/MFSK SYSTEMS COMBINING DIVERSITY WITH CODES OVER A SHORT WAVE CHANNEL 甘良才 Gan Liangcai 1 first-author 余建国 Yu Jianguo 1 武汉大学电子信息学学院 武汉大学电子信息学学院 College of Electronic information,Wuhan University College of Electronic information,Wuhan University 研究了选择式频率分集Ｍ进制频移键控慢跳频（ＳＦＨ／ＭＦＳＫ）系统在多径瑞利衰落信道中的性能，分析了部分边带干扰，多径干扰，信道热噪声和调制阶数Ｍ对无编码和有编码系统性能的影响．研究结果表明，多径干扰强度和信道热噪声对系统性能影响较大，分集仅能在一定程度上削弱它们对系统性能的影响，只有在分集与编码相结合，并采用适当的调制阶数Ｍ时，才能显著地改善系统的性能． Studies the performance of selective frequency SFH/MFSK systems combining diwerslty with codes over a multipath rayleigh fading channel. The effect of multipath on uncomed and coded system performance is analyzed including partial--band interference, channel thermal noise and modulation orders M. Research indicates that the strength of multipath and channel thermal noise have great effect on the system performance. Diversity can reduce their effect in a way. Only employing the moderate moduation orders M and the technique that codes are combined with diversity, system performance can be dramatically improved. 频率选择式 多径衰落 分集与编码 selective frequency multiputh fading diversity and codes TN926.2 国家自然科学基金,国防预研基金 1995-01-01 2021-04-01 1