Serially-concatenated low-density for transmission over AWGN generator matrix (SCLDGM) codes and Rayleigh fading channels

作     者：Gonzalez-Lopez, Miguel Vazquez-Araujo, Francisco J. Castedo, Luis Garcia-Frias, Javier 

作者机构：Univ A Coruna Dept Elect & Sistemas La Coruna 15071 Spain Univ Delaware Dept ECE Newark DE 19716 USA 

出 版 物：《IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS》 (IEEE Trans. Wireless Commun.)

年 卷 期：2007年第6卷第8期

页      面：2753-2758页

核心收录：

学科分类：0810[工学-信息与通信工程] 0808[工学-电气工程] 08[工学] 

基　　金：Secretaría de Estado de Universidades e Investigación del Ministerio de Educación y Ciencia of Spain, (SAB-2005-0172) National Science Foundation, NSF, (CCR-0311014, CR-0093215) National Science Foundation, NSF Army Research Laboratory, ARL, (DAAD19-01-2-0011) Army Research Laboratory, ARL Ministerio de Educación Superior, Ciencia y Tecnología, República Dominicana, MESCYT European Commission, EC, (PGIDT05PXIC10502PN, PGIDT06TIC10501PR, TEC2004-06451-C05-01) European Commission, EC European Regional Development Fund, FEDER Xunta de Galicia 

主　　题：code design Gaussian channels LDGM codes LDPC codes Rayleigh fading channels 

摘      要：Low Density Generator Matrix (LDGM) codes are a particular class of Low Density Parity Check (LDPC) codes with very low encoding complexity. Single LDGM codes present high error-floors, which can be substantially reduced with the serial concatenation of two LDGM (SCLDGM) codes. We propose a technique to obtain good SCLDGM codes using EXtrinsic Information Transfer (EXIT) functions in a novel way. Although the optimization is performed for AWGN channels with binary signaling, the resulting codes are also optimal for AWGN and perfectly-interleaved Rayleigh fading channels with non-binary signaling and perfect CSI at reception, provided that Gray mapping is utilized. Optimized regular and irregular SCLDGM codes outperform heuristically-designed LDGM codes existing in the literature, and have a performance similar to or better than that of Irregular Repeat Accumulate (IRA) codes.