Title :
Achieving general points in the 2-user Gaussian MAC without time-sharing or rate-splitting by means of iterative coding
Author :
Amraoui, A. ; Dusad, Sanket ; Urbanke, Rudiger
Author_Institution :
Commun. Theor. Lab., Swiss Fed. Inst. of Technol., Lausanne, Switzerland
Abstract :
In this paper, we analyze iterative coding for the frame-asynchronous binary-input discrete-time Gaussian multiple access channel. Using the method of density evolution, we optimize degree distributions to exhibit code ensembles whose iterative decoding thresholds are only few tenths of dB away from the Shannon limit.
Keywords :
Gaussian channels; iterative decoding; multi-access systems; multiuser channels; parity check codes; statistical analysis; 2-user Gaussian MAC; LDPC degree distribution; Shannon limit; binary-input discrete-time channel; code ensembles; degree distribution; density evolution; factor graph; frame-asynchronous Gaussian multiple access channel; general points; iterative coding; iterative decoding thresholds; optimization; Iterative decoding; Laboratories; Message passing; Microwave integrated circuits; Optimization methods; Parity check codes; Random variables; Time sharing computer systems;
Conference_Titel :
Information Theory, 2002. Proceedings. 2002 IEEE International Symposium on
Print_ISBN :
0-7803-7501-7
DOI :
10.1109/ISIT.2002.1023606
