Wireless communication systems that rely on orthogonal frequency-division multiplexing (OFDM) suffer from a high peak-to-average (power) ratio (PAR), which necessitates power-inefficient radio-frequency (RF) chains to avoid an increase in error-vector magnitude (EVM) and out-of-band (OOB) emissions. The situation is further aggravated in massive multiuser (MU) multiple-input multiple-output (MIMO) systems that would require hundreds of linear RF chains. In this paper, we present a novel approach to joint precoding and PAR reduction that builds upon a novel $\ell^p\!-\!\ell^q$-norm formulation, which is able to find minimum PAR solutions while suppressing MU interference. We provide a theoretical underpinning of our approach and provide simulation results for a massive MU-MIMO-OFDM system that demonstrate significant reductions in PAR at low complexity, without causing an increase in EVM or OOB emissions.
翻译:无线通信系统依赖正方位频率分散多路传输系统(OFDM),受到高峰至平均(功率)比率(PAR)的困扰,这就需要电效低射频链,以避免错误-矢量(EVM)和带外(OB)排放量增加,大规模多用户(MU)多投入多产出(MIMO)系统的情况进一步恶化,这些系统需要数百个线性RF链。在本文中,我们提出了一个新的联合预编码和PAR削减方法,该方法以新颖的 $\ell ⁇ p\\\\\\\\\\\\\\ell\q$-norm配方为基础,能够在抑制MU干扰的同时找到最低限度的PAR解决方案。我们为我们的方法提供了理论基础,并为大规模多用户(MU-MO-OFDM)多产出系统提供了模拟结果,该系统在不增加EVMRM或OBOB排放量的情况下,表明在低复杂性情况下显著减少PAR。