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

fYear

2008

fDate

11-14 May 2008

Firstpage

1157

Lastpage

1161

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2008. VTC Spring 2008. IEEE

Conference_Location

Singapore

ISSN

1550-2252

Print_ISBN

978-1-4244-1644-8

Electronic_ISBN

1550-2252

Type

conf

DOI

10.1109/VETECS.2008.245

Filename

4525801