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Does every bit need the same power? An investigation on unequal power allocation for irregular LDPC codes

Qi, Hanghang and Malone, David and Subramanian, Vijay G. (2009) Does every bit need the same power? An investigation on unequal power allocation for irregular LDPC codes. Wireless Communications & Signal Processing, 2009. WCSP 2009. International Conference on , ISBN 978-1-4244-4856-2 . pp. 1-5.

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Abstract

Irregular LDPC codes can have capacityapproaching performance with an iterative BP decoder under AWGN channel with BPSK modulation. Generally in BPSK modulation, every bit within the block has the same power. In this paper, we investigate unequal power allocation (UPA) using BPSK modulation for irregular binary LDPC codes. We show that constant power modulation need not lead to the best performance. With UPA we see gains of up to 0.25dB, with larger gains possible if the receiver knows the details of the UPA scheme. Optimal power allocation is shown to depend strongly on the codes in use. Our work demonstrates the promise of the UPA scheme for some irregular LDPC

Item Type: Article
Keywords: AWGN channels; binary codes; iterative decoding; parity check codes; phase shift keying; unequal power allocation; irregular LDPC codes;
Subjects: Science & Engineering > Hamilton Institute
Item ID: 2214
Identification Number: DOI: 10.1109/WCSP.2009.5371640
Depositing User: Dr. David Malone
Date Deposited: 26 Oct 2010 15:47
Journal or Publication Title: Wireless Communications & Signal Processing, 2009. WCSP 2009. International Conference on , ISBN 978-1-4244-4856-2
Publisher: IEEE
Refereed: Yes
URI:

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