抗多径的线性合并SFH／MFSK系统在短波信道中的性能

抗多径的线性合并SFH／MFSK系统在短波信道中的性能 THE PERFORMANCE OF ANTI-MULTIPATH LINEAR COMBINING SFH/MFSK SYSTEMS OVER A SHORT WAVE CHANNEL 甘良才 1 first-author 余建国 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 在线性合并接收机的基础上，引入了抗多径干扰的措施，并分析了这类新型接收机在存在部分边带干扰的多径瑞利衰落信道中的性能，着重研究了多径加权因子对系统性能的影响．研究结果表明，最佳加权因子ω＊与多径干扰强度，分集重数，调制阶数和信道热噪声有关。对多径合适地加权可明显地改善系统的性能，在分集和编码相结合时，能使Ｐｂ下降２～３个数量级同时本文还研究了分集重数Ｌ和调制阶数Ｍ对系统性能的影响． Presents a new kind of receiver by adding anti-multipath measures to the linear combining receiver, analyzes its performance over a multipath Rayleigh fading channel with partial-band noise jamming, and puts special emphasis on the effect of the multipath weighting factor w on the performance. Research shows that the optimum weighting factor ω* concerns the multipath interference strength, diversity numbers L, modulation order M and channel thermal noise ;the performance can be apparently improved by weighting multipath moderately. When codes are combined with diversity, bit error probability decreases by 2 to 3 magnitudes. The effect of diversity Number L and modulation order M on the modified receiver is also included. 瑞利衰落 慢跳频 线性合并 Rayleigh fading slow frequency-hopping linear combining TN911.1 国家自然科学基金,国防预研基金 1995-05-01 2021-04-01 5