Title: Nonlinear symbols combining for Power Amplifier-distorted OFDM signal reception Show Chinese title

Title: 非线性符号组合用于功率放大器失真OFDM信号接收

Abstract: Nonlinear distortion of a multicarrier signal by a transmitter Power Amplifier (PA) can be a serious problem when designing new highly energy-efficient wireless systems. Although the performance of standard reception algorithms is seriously deteriorated by the nonlinear distortion, the more advanced solutions allow the utilization of additional frequency diversity caused by nonlinear PA. However, while most of the advanced receivers are decision-aided, their gains are observed mostly in a relatively low Bit Error Rate (BER) region, not targeted by adaptive Modulation Coding Schemes utilizing Forward Error Correction (FEC). In this paper, a non-decision-aided Higher-Order Combining (HOC) reception scheme is proposed. While the analytical formulas for finding symbols combining coefficients are not known, machine learning is used for deriving them. The simulation results show an improved BER performance with respect to a standard reception and one of the established decision-aided receivers. However, as HOC has computational complexity that increases rapidly with the number of subcarriers utilized, more studies are needed to apply it in a wideband system. Show Chinese abstract

Abstract: 发射机功率放大器（PA）引起的多载波信号非线性失真在设计新的高能效无线系统时可能是一个严重问题。尽管标准接收算法的性能会因非线性失真而显著恶化，但更先进的解决方案允许利用由非线性PA引起的附加频率分集。然而，虽然大多数先进的接收机是基于判决辅助的，但它们的增益主要体现在相对较低的比特误码率（BER）区域，而不是自适应调制编码方案所针对的目标区域，这些方案利用了前向纠错（FEC）。本文提出了一种非判决辅助的高阶组合（HOC）接收方案。虽然尚未找到求解符号组合系数的解析公式，但使用了机器学习来推导这些系数。仿真结果显示，该方案相对于标准接收和一种已确立的判决辅助接收机具有改进的BER性能。然而，由于HOC的计算复杂度随着所使用的子载波数量迅速增加，在宽带系统中应用它还需要更多的研究。