Nakagami衰落信道下NNC-DFH接收机抗部分频带干扰性能分析

Performance Analysis of NNC-DFH Receiver over Nakagami Fading Channel with Partial-band Jamming

该文提出了一种噪声归一化合并(NNC)差分跳频(DFH)接收机模型以提高差分跳频系统抗部分频带干扰能力。给出了Nakagami衰落信道下NNC-DFH接收机在部分频带干扰及背景热噪声下误符号率边界的闭式表达式,并采用矩生成函数法进一步求得了衰落指数m为整数时的简化性能边界。仿真结果表明:在非最坏部分频带干扰下,仅在衰落较弱且干扰能量较为分散的特殊情况下,线性合并(LC)DFH接收机性能略优于NNC-DFH接收机,其它情况下NNC-DFH接收机总是优于LC-DFH接收机,且干扰越集中性能优势越显著;在最坏部分频带干扰下,NNC-DFH接收机的抗部分频带干扰性能优于LC-DFH接收机,与信道衰落程度及干扰带宽因子取值无关。

Noise-Normalization Combining（NNC） is applied in Differential Frequency Hopping（DFH） receiver to improve the performance of DFH system in rejecting Partial-Band Jamming（PBJ）.Symbol Error Rate（SER） performance of this receiver over Nakagami fading channel with PBJ and background thermal noise is analyzed and closed-form expression of SER is derived.A simplified expression for fading parameter m integer is derived based on moment generating function method.Simulation results show that for non-worst case PBJ,NNC-DFH receiver is superior to Linear Combining（LC） DFH receiver except when channel fading is weak and the jamming power is dispersed.Concentrating of the jamming power leads to more performance improvements.For worst case PBJ,this superiority always exists and is not affected by channel fading parameter and jamming bandwidth factor.