Ofdm

866 IEEE TRANSACTIONS ON BROADCASTING, VOL. 57, NO. 4, DECEMBER 2011

A Low-Complexity SLM Scheme Using

Additive Mapping Sequences for PAPR

Reduction of OFDM Signals

Hyun-Bae Jeon, Jong-Seon No, Senior Member, IEEE, and Dong-Joon Shin, Senior Member, IEEE

Abstract—The selected mapping (SLM) scheme is one of

the well-known peak-to-average power ratio (PAPR) reduction

schemes for orthogonal frequency division multiplexing (OFDM)

systems. A number of low-complexity SLM schemes have been

proposed but most of them reduce the computational complexity

at the cost of bit error rate (BER) or PAPR reduction performance

degradation. In this paper, a new low-complexity SLM scheme is

proposed, which generates alternative signal sequences by adding

mapping signal sequences to an OFDM signal sequence. The proposed

scheme considerably reduces the computational complexity

without sacrificing BER and PAPR reduction performance only

by requiring additional memory to save the additive mapping

signal sequences, especially for the OFDM system with quadrature

amplitude modulation (QAM). Similarly, a low-complexity SLM

scheme is proposed for multi-input multi-output (MIMO) OFDM

system with space-frequency block code (SFBC).

Index Terms—Additive mapping sequences, low complexity,

orthogonal frequency division multiplexing (OFDM), peak-to-average

power ratio (PAPR), selected mapping (SLM).

I. INTRODUCTION

ORTHOGONAL frequency division multiplexing

(OFDM) is an attractive technique for wireless communications

because it supports robust reliability and high data

rate in the frequency selective fading channel environments.

However, the OFDM signals show high peak-to-average power

ratio (PAPR) in the time domain, which causes significant

inter-modulation and undesirable out-of-band radiation when

an OFDM signal passes through nonlinear devices such as high

power amplifier (HPA) [1], [2].

Several techniques have been proposed to mitigate the high

PAPR of OFDM...