| 摘要: |
| 提出了一种基于Chase算法的低复杂度时域均衡技术。首先通过传统的自适应均
衡器获取软值，再利用Chase算法计算可信度找到不可靠位，同时构造测试序列，然后进行
滑动窗搜索和逐比特译码。此算法在减小计算量的同时消除了译码时延，并且误码率逼近
最大似然序列估计，实现了复杂度和性能的折衷。 |
| 关键词: 短波通信 时域均衡 Chase算法 码间串扰 滑动窗 最大似
然序列估计 |
| DOI： |
|
| 基金项目: |
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| A Low Complexity Time Domain Equalization Method in HF Communications |
| TANG Lei,ZHANG Zhe,SHEN Liang,CHENG Yun-peng |
| (Institute of Communications Engineering ,PLA University of Science and Techn
ology,Nanjing 210007,China;Institute of Communications Engineering ,PLA University of Science and Techn
ology,Nanjing 210007,China;
Unit 65043 of PLA,Songyuan 131500,China) |
| Abstract: |
| A low complexity time domain equalization technique based on the Chase
algorithm is proposed in this paper. The algorithm first extracts the soft outp
ut of a conventional adaptive equalizer, and then uses the Chase algorithm to fi
nd unreliable bits. At the same time, it structures test sequences and uses a sl
iding-window to decode bit by bit. Theoretical analysis shows that the proposed
algorithm decreases the operation and eliminates decoding delay. Numerical simul
ation reveals that the proposed algorithm approaches the bit error rate（BER） o
f Maximum Likelihood Sequence Estimation (MLSE) and achieves a good tradeoff bet
ween complexity and performance. |
| Key words: HF communications time domain equalizations Chase algorithm intersymbol interference(ISI) sliding
-window MLSE |
