壓縮頻譜的差分跳頻信號在萊斯衰落信道下的性能分析
doi: 10.11999/JEIT140908
基金項目:
國家自然科學(xué)基金(61201126)，新世紀(jì)優(yōu)秀人才支持計劃(NCET- 11-0058)和四川省青年科技基金(2012JQ0020)資助課題
Performance of a Compressed Spectrum Differential Frequency Hopping Signal over Rician Fading Channel
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摘要: 差分跳頻(DFH)信號具有良好的抗多徑衰落、抗干擾及高速數(shù)據(jù)傳輸能力，在短波和水聲軍事通信領(lǐng)域得到廣泛應(yīng)用。但是，在有限的傳輸帶寬內(nèi)差分跳頻信號編碼增益受限，特別是每跳攜帶多個比特時，該文提出一種壓縮頻譜DFH(CS-DFH)方法，可以在相同的比特每跳(BPH)和帶寬下提高DFH信號的編碼增益。對CS-DFH信號在萊斯(Rice)衰落信道下的誤比特率(BER)理論上界進行了推導(dǎo)，并通過仿真驗證。結(jié)果表明，萊斯信道中，在相同BPH、帶寬條件下，與常規(guī)DFH相比，CS-DFH是一種可以獲得更高BER增益的方法，特別是當(dāng)萊斯因子K很小的時候。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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