Title :
Optimum Power Loading with Arbitrary Square MQAM for OFDM Systems
Author :
Liu, Kaiming ; Liu, Yuan´an ; Tang, Bihua
Author_Institution :
Sch. of Electron. Eng., Beijing Univ. of Posts & Telecommun. (BUPT), Beijing, China
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.
Keywords :
OFDM modulation; adaptive modulation; error statistics; quadrature amplitude modulation; M-ary quadrature amplitude modulation; OFDM system; adaptive power loading algorithm; arbitrary square M-QAM mode; bit error rate; closed-form expression; orthogonal frequency division multiplexing; Bit error rate; Bit rate; Broadband communication; Closed-form solution; Modulation coding; OFDM modulation; Partitioning algorithms; Power distribution; Power engineering and energy; Quadrature amplitude modulation;
Conference_Titel :
Wireless Communications, Networking and Mobile Computing, 2009. WiCom '09. 5th International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-3692-7
Electronic_ISBN :
978-1-4244-3693-4
DOI :
10.1109/WICOM.2009.5303144
