A New Low-Complexity Selected Mapping Scheme Using Cyclic Shifted IFFT for PAPR Reduction in OFDM Systems

TL;DR

This paper introduces a low-complexity selected mapping scheme for OFDM that reduces PAPR by cyclically shifting IFFT connections, achieving similar performance to existing methods with less computation and no BER impact.

Contribution

It proposes a novel SLM scheme using cyclic shifts at an intermediate IFFT stage, significantly lowering computational complexity without sacrificing PAPR reduction performance.

Findings

Achieves comparable PAPR reduction to conventional SLM

Reduces computational complexity significantly

Maintains BER performance without degradation

Abstract

In this paper, a new peak-to-average power ratio (PAPR) reduction scheme for orthogonal frequency division multiplexing (OFDM) is proposed based on the selected mapping (SLM) scheme. The proposed SLM scheme generates alternative OFDM signal sequences by cyclically shifting the connections in each subblock at an intermediate stage of inverse fast Fourier transform (IFFT). Compared with the conventional SLM scheme, the proposed SLM scheme achieves similar PAPR reduction performance with much lower computational complexity and no bit error rate (BER) degradation. The performance of the proposed SLM scheme is verified through numerical analysis. Also, it is shown that the proposed SLM scheme has the lowest computational complexity among the existing low-complexity SLM schemes exploiting the signals at an intermediate stage of IFFT.