Interleave-division multiple access (IDMA) using low-rate layered LDGM codes

Author

González-López, M. ; Vázquez-Araújo, F.J. ; Castedo, L. ; Garcia-Frias, J.

Author_Institution

Dept. de Electron. y Sist., Univ. da Coruna, A Coruna

fYear

2008

fDate

1-5 Sept. 2008

Firstpage

315

Lastpage

320

Abstract

We propose the use of low-rate layered LDGM codes to approach the capacity of the AWGN multiple access channel (MAC). To support a high number of users, iterative soft-interference cancellation (SIC) is used at reception. For optimum performance, we design the channel codes to match the extrinsic information transfer (EXIT) function of this detector, which varies with the number of users and modulation format. Simulation results show that the designed codes effectively approach the theoretical limits, outperforming previous IDMA schemes based on turbo-Hadamard codes.

Keywords

AWGN channels; Hadamard codes; interference suppression; interleaved codes; iterative methods; multi-access systems; turbo codes; AWGN multiple access channel; Interleave-division multiple access; extrinsic information transfer function; iterative soft-interference cancellation; low-rate layered LDGM codes; turbo-Hadamard codes; AWGN; Code standards; Concatenated codes; Detectors; Error correction; Error correction codes; Modulation; Multiaccess communication; Silicon carbide; Turbo codes;

fLanguage

English

Publisher

ieee

Conference_Titel

Turbo Codes and Related Topics, 2008 5th International Symposium on

Conference_Location

Lausanne

Print_ISBN

978-1-4244-2862-5

Electronic_ISBN

978-1-4244-2863-2

Type

conf

DOI

10.1109/TURBOCODING.2008.4658718

Filename

4658718