Title :
Adaptive power loading based on unequal-ber strategy for OFDM systems
Author :
Liu, Kaiming ; Tang, Bihua ; Liu, Yuan An
Author_Institution :
Sch. of Electron. Eng., Beijing Univ. of Posts & Telecommun., Beijing, China
fDate :
7/1/2009 12:00:00 AM
Abstract :
An adaptive power loading algorithm with uniform (nonadaptive) bit allocation is proposed for constant data rate OFDM systems in this letter. This algorithm aims to minimize the transmit power while guaranteeing the target mean bit error rate (BER). The power loading is based on the unequal-BER (UBER) strategy which permits unequal mean BERs on different subcarriers. The closed-form expressions for optimal BER and power distributions are derived. Simulation results indicate the superiority of the proposed algorithm.
Keywords :
OFDM modulation; adaptive modulation; error statistics; multipath channels; OFDM systems; adaptive power loading; bit allocation; bit error rate; power distributions; unequal-BER; Bit error rate; Bit rate; Broadband communication; Closed-form solution; Frequency division multiplexing; Modulation coding; OFDM; Partitioning algorithms; Power distribution; Wireless communication;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2009.082158
