Optimum power loading with arbitrary square MQAM for OFDM systems

Authors:
Kaiming Liu;Yuan'an Liu;Bihua Tang
Affiliations:
School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, China;School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, China;School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, China
Venue:
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Year:
2009

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Abstract

An adaptive power loading algorithm for orthogonal frequency division multiplexing (OFDM) systems with given arbitrary square M-ary quadrature amplitude modulation (MQAM) modes on subcarriers is proposed in this paper. This algorithm aims to minimize the total transmit power while guaranteeing the target overall bit error rate (BER), and can achieve the optimum power loading results through optimizing the BER distribution. The closed-form expressions for optimal BER and power distributions are presented. Simulation results indicate the superiority of the proposed algorithm in terms of algorithmic performance and complexity.