Coded modulation faster-than-Nyquist transmission with precoder and channel shortening optimization
Coded modulation faster-than-Nyquist transmission with precoder and channel shortening optimization
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DOI：
10.23919/jcc.2021.02.005
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发表时间：
2021-02
影响因子：
4.1
通讯作者：
Hui Che;Yong Bai
中科院分区：
文献类型：
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作者：
Hui Che;Yong Bai
快于奈奎斯特（FTN）信令可以提高传输系统的频谱效率（SE）。在本文中，我们提出了一种编码调制FTN（CM-FTN）传输方案与预编码器和信道缩短（CS）的优化，以提高误码率（BER）性能，降低FTN均衡器的复杂度。在我们的建议中，信息率（IR）或频谱效率（SE）被采用，并验证为CM-FTN比最小欧几里得距离（MED）更好的性能指标。CM-FTN的预编码器优化最大化的IR标准使用基本粒子群优化算法（BB-PSO）。此外，三载波CM-FTN系统模型被用来捕捉预编码器的展宽效应。同样以IR最大化为目标，CS的符号间干扰（ISI）长度被优化以在不损失性能的情况下降低接收机复杂度。仿真结果表明，与非预编码方案相比，该方法具有0.6dB的预编码增益，在不损失误码率的情况下，FTN均衡器的复杂度最多可降低87.5%。
Faster-than-Nyquist (FTN) signaling can improve the spectrum efficiency (SE) of the transmission system. In this paper, we propose a coded modulation FTN (CM-FTN) transmission scheme with precoder and channel shortening (CS) optimization to improve bit error rate (BER) performance and reduce the complexity of FTN equalizer. In our proposal, the information rate (IR) or spectral efficiency (SE) is employed and verified as a better performance metric for CM-FTN than the minimum Euclidian distance (MED). The precoder of CM-FTN is optimized for maximizing the IR criterion using the bare-bones particle swarm optimization (BB-PSO) algorithm. Further, a three-carrier CM-FTN system model is used to capture the broadening effect of precoder. Also targeting for the IR maximization, the inter-symbol interference (ISI) length for CS is optimized to reduce the receiver complexity without performance loss. Simulation results demonstrate that our method has a 0.6dB precoding gain compared with the non-precoding scheme and a maximum of 87.5% of the complexity of FTN equalizer is reduced without BER loss.