Title :
Optimum band allocation according to subband condition for BST-OFDM
Author :
Motegi, Masayuki ; Kohno, Ryuji
Author_Institution :
Fac. of Eng., Yokohama Nat. Univ., Japan
Abstract :
This paper proposes and investigates optimum band allocation scheme and modulation assignment for band-segmented transmission OFDM (BST-OFDM) according to different environment characteristics of each segmented band or subband channel. The proposed system can adaptively optimize the allocation of subbands according to a conditional parameter, that is, the CNR under independently fading subband channels. The optimization criterion is the minimum total BER performance under the constraint conditions that are the total bandwidth, the number of subbands and the constant total information bit rate. The subband condition is updated by the feedback information from the receiver. The proposed adaptive band allocation BST-OFDM system can overperform the conventional BST-OFDM system in which subbands are divided with equal bandwidth
Keywords :
OFDM modulation; bandwidth allocation; error statistics; fading channels; feedback; optimisation; BST-OFDM; CNR; adaptive band allocation; adaptive optimization; band-segmented transmission OFDM; conditional parameter; constant total information bit rate; constraint conditions; environment characteristics; feedback information; independently fading subband channels; minimum total BER performance; optimum band allocation; optimum modulation assignment; orthogonal frequency division multiplexing; receiver; subband channel; subband condition; total bandwidth; Adaptive systems; Bandwidth; Bit error rate; Computer simulation; Constraint optimization; Digital audio broadcasting; Fading; Multimedia communication; OFDM; TV broadcasting;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2000. PIMRC 2000. The 11th IEEE International Symposium on
Conference_Location :
London
Print_ISBN :
0-7803-6463-5
DOI :
10.1109/PIMRC.2000.881616
