A Decoding Feedback Equalization Algorithm Based on Residual Estimation

LI Xiaohui; WEI Xiaobo; SHI Mingli; LYU Siting

doi:10.3969/j.issn.2097-1915.2025.03.005

Abstract：In the air communication environment,especially in the air-to-air communication at the cruise phase of aircraft,serious multipath interference existed in channel may lead the received signals to become distortion or inter-symbol crosstalk,seriously affecting the communication quality.In consideration of that the residual inter-code of existing linear equalization algorithm seriously affects the equalization per-formance,resulting in error transmission errors,and the traditional MMSE-RISIC algorithm is limited by the accuracy of noise and decision to make the overall equalization performance limited,a decoding feed-back equalization algorithm is proposed based on the residual estimation to reduce the impact of noise and inter-code interference on system performance.On the basis of MMSE equalization,first,the known se-quence is utilized for estimating the noise,and then introducing a decoding interleaving module to improve the decision reliability.Finally,the verdict signal is used to estimate the residual inter-symbol inter-ference.The simulation results show that under the 16QAM modulation,the decoding feedback equaliza-tion algorithm based on residual estimation has 0.5 dB error performance improvement compared with the traditional MMSE equalization algorithm in aviation communication channel environment.