压缩频谱的差分跳频信号在莱斯衰落信道下的性能分析
doi: 10.11999/JEIT140908
Performance of a Compressed Spectrum Differential Frequency Hopping Signal over Rician Fading Channel
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摘要: 差分跳频(DFH)信号具有良好的抗多径衰落、抗干扰及高速数据传输能力，在短波和水声军事通信领域得到广泛应用。但是，在有限的传输带宽内差分跳频信号编码增益受限，特别是每跳携带多个比特时，该文提出一种压缩频谱DFH(CS-DFH)方法，可以在相同的比特每跳(BPH)和带宽下提高DFH信号的编码增益。对CS-DFH信号在莱斯(Rice)衰落信道下的误比特率(BER)理论上界进行了推导，并通过仿真验证。结果表明，莱斯信道中，在相同BPH、带宽条件下，与常规DFH相比，CS-DFH是一种可以获得更高BER增益的方法，特别是当莱斯因子K很小的时候。Abstract: Differential Frequency Hopping (DFH) signal can be used in the High Frequency (HF) and underwater acoustic communications because it has good resistance to multipath fading and jamming, at the same time with a high-speed data transmission capacity. However, taking into account the coding gain is limited within a finite transmission bandwidth, especially multiple Bit Per Hop (BPH), a Compressed Spectrum DFH (CS-DFH) method is proposed to increase the coding gain of DFH signal for the same BPH and bandwidth. This paper develops an upper bound on the Bit Error Rate (BER) of CS-DFH signal in Rician channel, and its tightness is proved by simulations. For the same BPH and bandwidth, the results indicate that the CS-DFH is an efficient mean for obtaining higher coding gain than the existing DFH over the Rician channel, especially when the Rician factor K is small.
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