A Companding Technique to Reduce Peak-to-Average Ratio in Discrete Multitone Wireline Receivers

IF 2.4 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE open journal of circuits and systems Pub Date : 2024-07-16 DOI:10.1109/OJCAS.2024.3427693
Miad Laghaei;Hossein Shakiba;Ali Sheikholeslami
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Abstract

Multicarrier modulation, while providing a theoretical pathway to data rates approaching the Shannon limit and being extensively utilized in wireless communication, has encountered limited application in high-speed wireline communication. This limitation is primarily due to substantial large amplitude peaks, which necessitates a reduction in the signal’s power levels to circumvent signal clipping. This, in turn, results in a low signal-to-noise ratio (SNR) which puts these modulations at a serious disadvantage compared to conventional modulation schemes. This work proposes a novel companding solution in the design of the Continuous Time Linear Equalizer (CTLE) alongside nonlinear blocks to reduce Peak to Average Power Ratio (PAPR), therefore improving the overall link performance. This paper presents a PAPR reduction technique and its implementation in the receiver, distinguishing it from previous studies that place the compander at the transmitter where it fails to work in the presence of an Inter-Symbol Interference (ISI) channel. A theoretical study as well as an implementation of this method is provided, and the merits and performance improvements are demonstrated.
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降低离散多音有线接收器峰均比的压缩技术
多载波调制虽然为接近香农极限的数据传输率提供了理论途径,并在无线通信中得到广泛应用,但在高速有线通信中的应用却很有限。造成这种限制的主要原因是振幅峰值过大,需要降低信号的功率水平以避免信号削波。这反过来又导致信噪比(SNR)较低,使这些调制与传统调制方案相比处于严重劣势。本研究在设计连续时间线性均衡器(CTLE)时提出了一种新颖的压缩解决方案,与非线性块一起降低峰均功率比(PAPR),从而提高整体链路性能。本文介绍了一种降低 PAPR 的技术及其在接收器中的应用,有别于以往将压缩器置于发射器的研究,后者在存在符号间干扰(ISI)信道的情况下无法工作。本文对这种方法进行了理论研究和实施,并展示了其优点和性能改进。
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