Optimal Power Control for LDPC Codes in Block-Fading Channels

Author

Lechner, Gottfried ; Nguyen, Khoa D. ; Fàbregas, Albert Guillén I ; Rasmussen, Lars K.

Author_Institution

Inst. for Telecommun. Res., Univ. of South Australia, Mawson Lakes, SA, Australia

Volume

59

Issue

7

fYear

2011

fDate

7/1/2011 12:00:00 AM

Firstpage

1759

Lastpage

1765

Abstract

We study the error probability of LDPC codes in delay-limited block-fading channels with channel state information (CSI) at the transmitter and the receiver. We derive the optimal power allocation algorithms for LDPC codes with specific degree distributions using multi-edge-type density evolution error boundaries. The resulting performance approaches the outage probability for a number of power constraints. Furthermore, we adapt the algorithm for finite-length codes and show that the proposed algorithm enables gains larger than 10 dB over uniform power allocation. The method is valid for general, possibly correlated, fading distributions. This represents the first analysis of specific LDPC codes over block-fading channels with full CSI.

Keywords

block codes; delays; error statistics; fading channels; optimal control; parity check codes; power control; receivers; transmitters; LDPC codes; channel state information; delay-limited block-fading channels; error probability; fading distributions; finite-length codes; multiedge-type density evolution error boundaries; optimal power allocation algorithms; optimal power control; receiver; transmitter; Error analysis; Error probability; Fading; Mutual information; Parity check codes; Resource management; Signal to noise ratio; Low-density parity-check (LDPC) codes; block-fading channel; density evolution; outage probability; power allocation;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/TCOMM.2011.051311.090238

Filename

5772068