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Coded Modulation Faster-than-Nyquist Transmission with precoder and Channel Shortening Optimization

China Communications 2021年第2期18卷 49-64页

作者： Hui Che Yong Bai School of Information and Communication Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China School of Information and Communication Engineering Hainan UniversityHaikou 570228China

Faster-than-Nyquist(FTN)signaling can improve the spectrum efficiency(SE)of the transmission *** 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 *** 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)***,a three-carrier CM-FTN system model is used to capture the broadening effect of *** targeting for the IR maximization,the inter-symbol interference(ISI)length for CS is optimized to reduce the receiver complexity without performance *** results demonstrate that our method has a 0.6dB precoding gain compared with the nonprecoding scheme and a maximum of 87.5%of the complexity of FTN equalizer is reduced without BER loss.

关键词： faster-than-Nyquist coded modulation information rate minimum Euclidian distance precoder channel shortening

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General precoder design for mitigation of intercarrier interference in OFDM mobile systems

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Journal of Pharmaceutical Analysis 2007年第1期19卷 46-50页

作者：王霞朱世华 School of Electronics and Information Engineering Xi'an Jiaotong University

For orthogonal frequency-division multiplexing(OFDM) communication systems,the frequency offset in mobile radio channels distorts the orthogonality between sub-carriers,which results in Intercarrier Interference(ICI) and seriously degrades the performance of *** on ICI coefficients analysis,a novel precoder design scheme is proposed for mitigation of *** this technique,precoder matrix is designed by the way of linear counteraction and inserted in the former transmitter *** simulation results show that this new scheme can effectively reduce ICI and significantly provide the carrier-interference power ratio *** with existing ICI mitigation schemes with channel estimation,the proposed scheme has lower computational complexity,and compared with self-cancellation scheme,the bandwidth efficiency can be improved in this proposed *** proposed scheme also has better convergence stability for time-varying frequency selective fading channel.

关键词： Intercarrier Interference precoder OFDM channel estimation

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