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为提高抗部分频带干扰的能力,在直接跳扩(DS/FH)的基础上提出一种交织跳扩(IDS/FH)系统,引入多跳间交织器实现码片的离散化,获得时频分集增益。通过将部分频带干扰下的跳扩系统等效为衰落条件下的单输入多输出(SIMO)系统,分别对DS/FH和IDS/FH的信道容量进行分析,得出部分频带干扰和高斯信道下的容量表达式,并给出了IDS/FH在部分频带干扰下的最佳接收方案。理论分析得出,在50%的强部分频带干扰,信噪比为10dB的Gauss信道下,IDS/FH的容量比DS/FH的提高49%。仿真结果表明:50%部分频带干扰下IDS/FH可达到的最低误码率比DS/FH的降低2个数量级。
In order to improve the capability of resisting partial frequency band interference, an interleaved hopping (IDS / FH) system is proposed based on direct hopping (DS / FH). The multilevel interleaver is used to discretize the chips to obtain time-frequency Diversity gain. The channel capacity of DS / FH and IDS / FH are respectively analyzed by simulating the system with hopping under partial-band interference as single-input multiple-output (SIMO) system under fading conditions. The capacity expression of IDS / FH is given and the best receiving scheme under partial frequency band interference is given. Theoretical analysis shows that the capacity of IDS / FH is 49% higher than that of DS / FH under 50% Gaussian channel with strong partial frequency interference and SNR of 10dB. The simulation results show that the lowest error rate achievable by IDS / FH under 50% partial-band interference is two orders of magnitude lower than DS / FH.