电讯技术2025，Vol.65Issue(5)：653-662,10.DOI:10.20079/j.issn.1001-893x.250327001
TA-DD-TransNet:一种面向时延-多普勒域的CSI反馈方法
TA-DD-TransNet:a CSI Feedback Method for Delay-Doppler Domain
摘要
Abstract
To address the channel state information(CSI)feedback challenge in multiple-input multiple-output-orthogonal time frequency space(MIMO-OTFS)systems for Internet of Vehicles(IoV),a time-differencing architecture delay-Doppler Transformer network(TA-DD-TransNet)tailored for CSI feedback in the delay-Doppler(DD)domain is proposed,the time-sharing feedback mechanism is introduced and residual information modeling is combined with compressive feedback.Because the network structure integrates the global modeling ability of Transformer and the local feature extraction advantages of convolutional neural network,it significantly reduces the number of feedback bits and the computational complexity while maintaining the reconstruction accuracy of CSI.The simulation experiments under different vehicle speeds,signal-to-noise ratios(SNRs)and imperfect channel estimation conditions show that the proposed method is superior to CsiNet,CsiNet+and BCsiNet in terms of normalized mean squared error(NMSE)and cosine similarity indicator.Under the condition of 60 km/h speed,30 dB SNR,and 1/4 compression ratio,the NMSE of TA-DD-TransNet is approximately-27 dB,and the cosine similarity is 0.96.Complexity analysis shows that the number of floating-point operations of the encoder and decoder of TA-DD-TransNet at the 1/4 compression ratio is 1.809×107 and 2.281×107 respectively,and the number of parameters is about 8.4×106 for both,which is significantly lower than that of CsiNet+.The proposed mathod can meet the actual demand for highly reliable and low-latency communication in IoV.关键词
车联网(IoV)/MIMO/OTFS/CSI反馈/时延-多普勒域Key words
Internet of Vehicles(IoV)/MIMO/OTFS/CSI feedback/delay-Doppler domain分类
电子信息工程引用本文复制引用
廖勇,罗渝,廖阳,叶彦劭..TA-DD-TransNet:一种面向时延-多普勒域的CSI反馈方法[J].电讯技术,2025,65(5):653-662,10.基金项目
重庆市自然科学基金面上项目(CSTB2023NSCQ-MSX0025) （CSTB2023NSCQ-MSX0025）
