| M维软解调的FH/MFSK系统抗PBNJ性能分析 |
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| 引用本文： | 杜洋,董彬虹,唐鹏,王莉.M维软解调的FH/MFSK系统抗PBNJ性能分析[J].电子科技大学学报（自然科学版）,2016,45(5):732-737. |
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| 作者姓名： | 杜洋 董彬虹 唐鹏 王莉 |
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| 作者单位： | 1.电子科技大学通信抗干扰技术国家级重点实验室 成都 611731 |
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| 基金项目： | 国家自然科学基金61201126新世纪优秀人才支持计划NCET-11-0058四川省青年科技基金2012JQ0020 |
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| 摘 要： | 针对FH/MFSK系统，提出一种MFSK信号的M维软解调能量信息，作为译码器软输入的方法，避免了近似比特对数似然信息（LLR）的计算，并结合卷积码，给出了相应的软译码算法。理论推导了采用该算法的FH/MFSK系统在AWGN和Rayleigh衰落信道下抗PBNJ性能，给出了BER的上界闭合表达式。计算机仿真验证了理论推导的正确性，并与近似比特LLR和硬判决2种译码器输入信息的FH/MFSK系统进行对比，证明该算法获得了明显的抗PBNJ处理增益。
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| 关 键 词： | 跳频 多元频移键控 部分频带噪声干扰 软解调 |
| 收稿时间： | 2015-03-13 |
Performance Analysis of M-Dimensions Soft-Demodulation for FH/MFSK Systems in the Presence of Partial-Band Noise Jamming |
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| Affiliation: | 1.National Key Laboratory of Science and Technology on Communications, University of Electronic Science and Technology of China Chengdu 6117312.Wu Han Communication Station, The Air Force Command Headquarters Wuhan 430079 |
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| Abstract: | For frequency hopping/M-ary frequency shift keying (FH/MFSK) Systems, combining convolutional coding, a soft decoding algorithm is proposed by adopting M-dimensions energy information for the soft-demodulation of MFSK signals as soft input of decoder, avoiding the approximate bit logarithm likelihood ratio (LLR) calculation. The theoretical performance of the proposed algorithm is analyzed for FH/MFSK systems in the presence of partial-band noise jamming (PBNJ) over additive white Gaussian noise (AWGN) and Rayleigh fading channels. The upper bound for closed-form expressions of BER performance are derived and validated by computer simulations. The results show that the proposed algorithm obtains obvious anti PBNJ processing gain compared to the approximate bit LLR and hard decision. |
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