在帶頻多波道干擾下應用低密度 奇偶檢驗碼於快跳頻系統之研究

Low-Density Parity-Check Codes for FFH/BFSK Systems under Band Multitone Jamming

黃仁厚(Jen-Hou Huang)

指導教授 ： 鄭立德

中原大學/工學院/電子工程研究所/碩士(2007年)

https://doi.org/10.6840/cycu200700950

摘要

摘要
跳頻展頻系統應用於對抗干擾是一個很有效率的技術。先
前對於干擾通道環境的研究主要偏重在部份頻帶雜訊干擾的
影響。在本篇論文中，將會探討低密度奇偶檢驗碼應用於快
跳頻展頻二元頻率鍵移系統上，在帶頻多波道干擾環境下其
系統的錯誤率表現。我們利用分集結合增益和編碼增益來加
強系統的效能表現。本篇論文中我們考慮使用最大可能性分
集結合技術及平方律等增益分集結合技術計算接收的碼字決
策可靠度。接著我們使用基於置信傳播的和積演算法來做遞
迴解碼的動作。模擬的結果顯示出，我們所提出的系統在對
抗帶頻多波道干擾時可以提供非常好的錯誤更正性能。

關鍵字

快跳頻 ； 低密度奇偶檢驗碼 ； 帶頻多波道干擾

並列摘要

Abstract
Frequency-hopping spread-spectrum is an e cient technique to
combat jamming. Previous works in jamming channels pay more
attention to partial band noise jamming. In this paper, Low-
Density Parity-Check coded fast frequency hopping binary fre-
quency shift keying spread-spectrum systems are investigated
under band multitone noise jamming. We take the advantage
of both diversity gain and coding gain for enhancing the system
performance. We consider maximum-likelihood diversity comb-
ing and square-law with equal gain combing schemes which are
used to compute the codeword bit decision reliability. The sum-
product algorithm based on belief propagation is exploited for
iterative decoding. Simulation results reveal that our proposed
system provides excellent performance against band multitone
noise jamming.

並列關鍵字

ffh ； band multitone jamming ； low-density parity-check codes

參考文獻

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Solomon coded frequency-hop spread-spectrum communi-

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Performance of Low Density Parity Check Codes," Electron.