Power- and bandwidth-efficient communications using LDPC codes

Author

Limpaphayom, Piraporn ; Winick, Kim A.

Author_Institution

Electr. Eng. & Comput. Sci. Dept., Univ. of Michigan, Ann Arbor, MI, USA

Volume

52

Issue

3

fYear

2004

fDate

3/1/2004 12:00:00 AM

Firstpage

350

Lastpage

354

Abstract

We apply low-density parity-check (LDPC) codes to a bandwidth-efficient modulation scheme using multilevel coding, multistage decoding, and trellis-based signal shaping. Performance results based on density evolution and simulations are presented. Using irregular LDPC component codes of block length 10⁵ and a 64-quadrature amplitude modulation signal constellation operating at 2 bits/dimension, a bit-error rate of 10^-5 is achieved at an E_b/N₀ of 6.55 dB. At this value of E_b/N₀, the Shannon channel capacity, computed assuming equally likely signaling, is below 2 bits/dimension.

Keywords

channel capacity; channel coding; decoding; modulation coding; parity check codes; quadrature amplitude modulation; trellis codes; LDPC codes; Shannon channel capacity; bandwidth efficient communication; bandwidth efficient modulation; density evolution; low density parity check codes; multilevel coding; multistage decoding; power efficient communication; quadrature amplitude modulation; signal constellation; trellis-based signal shaping; AWGN channels; Bit error rate; Channel capacity; Concatenated codes; Constellation diagram; Convolutional codes; Decoding; Modulation coding; Parity check codes; Quadrature amplitude modulation;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/TCOMM.2004.823565

Filename

1273682