Title :
LDPC Coded AMC Based on Decoding Iteration Times for OFDM Systems
Author :
Lihua, Li ; Mingyu, Zhou ; Yongtai, Xu ; Haifeng, Wang ; Ping, Zhang
Author_Institution :
Minist. of Educ.; Beijing Univ. of Posts & Telecommun. Wireless Technol. Innovation Inst.; Beijing, Beijing Univ. of Posts & Telecommun., Beijing
Abstract :
A low-density parity-check (LDPC) coded adaptive modulation and coding (AMC) strategy is presented for orthogonal frequency division multiplexing (OFDM) systems. Since system performance is improved as the maximum iteration times for LDPC decoding increase, iteration times for decoding reflect channel quality. We first propose an AMC strategy to utilize the information of iteration times for decoding to adopt higher order modulation and coding schemes (MCS) than the conventional strategy, so as to improve system throughput. Since it may bring worse reliability, hybrid automatic repeat request (H-ARQ) is used in a second strategy. Simulation under typical urban channel is carried out, and the results show the proposed strategies can bring higher throughput, and the strategy with H- ARQ can improve throughput and guarantee reliable transmission simultaneously.
Keywords :
OFDM modulation; adaptive codes; adaptive modulation; automatic repeat request; channel coding; iterative decoding; parity check codes; LDPC coded AMC; OFDM system; adaptive coding; adaptive modulation; channel quality; hybrid automatic repeat request; low-density parity-check code; orthogonal frequency division multiplexing; Automatic repeat request; Educational technology; Iterative decoding; Laboratories; Modulation coding; OFDM modulation; Parity check codes; Technological innovation; Throughput; Wireless communication;
Conference_Titel :
Vehicular Technology Conference, 2008. VTC Spring 2008. IEEE
Conference_Location :
Singapore
Print_ISBN :
978-1-4244-1644-8
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2008.245
