无线电通信技术2025，Vol.51Issue(3)：588-595,8.DOI:10.3969/j.issn.1003-3114.2025.03.018
GFDM系统中基于判决重构的迭代信道估计和干扰消除算法
Iterative Channel Estimation and Interference Cancellation Algorithm Based on Decision Feedback in GFDM Systems
摘要
Abstract
Loworbit satellite communication is becoming a key technology for new-generation satellite communication because of its advantages such as low transmission delay and flexible network organization.Generalized Frequency Division Multiplexing(GFDM),as a candidate waveform,can meet the requirements of its various application scenarios.In GFDM-basedlow orbit satellite communication networks,due to the non-orthogonal characteristics between GFDM subcarriers and the existence of time-frequency bi-directional selection in the low-orbit satellite channel,which leads to the existence of serious inter-subcarrier and inter-symbol inter-ference in the data symbols,making it difficult for traditional channel estimation algorithms to realize reliable data transmission.In addition,the existing Iterative Channel Estimation and Signal Detection Algorithm Based on Discrete Pilots(ICESD-DP)require high computational costs,although they improve the channel estimation accuracy under dual-selective channels.To address the above problems,an Iterative Channel Estimation and Interference Cancellation Algorithm Based on Judgment Reconstructed Symbols(ICEIC-JRS)is proposed.The algorithm uses the pilot frequency after interference preprocessing for initial channel estimation and equalization.Then it uses the judgment reconstructed symbols generated by the Turbo decoder in each iteration to estimate the effective gain and interference gain of the data symbols.Finally,it performs interference cancellation of the received symbols to improve the accuracy of channel estimation and symbol detection.Simulation results show that compared with the ICESD-DP algo-rithm,the ICEIC-JRS algorithm has better Bit Error Rate(BER)and Mean Square Error(MSE)performance with a higher number of iterations.In addition,the single iteration complexity of the ICEIC-JRS algorithm is one order of magnitude lower than that of the ICESD-DP algorithm,so it is more suitable for the low orbit satellite communication system where computational resources are limited.关键词
广义频分复用/迭代信道估计/干扰消除/Turbo译码/低轨卫星通信系统Key words
GFDM/iterative channel estimation/interference cancellation/Turbo decoding/low orbit satellite communication system分类
信息技术与安全科学引用本文复制引用
刘春刚,李泽鹏,王钢,王峻萱,李城达..GFDM系统中基于判决重构的迭代信道估计和干扰消除算法[J].无线电通信技术,2025,51(3):588-595,8.基金项目
国家自然科学基金(62071167) National Natural Science Foundation of China(62071167) （62071167）
