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Qi, Hanghang, 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; |
| Academic Unit: | Faculty of Science and Engineering > Research Institutes > 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 |
| Related URLs: | |
| URI: | https://mural.maynoothuniversity.ie/id/eprint/2214 |
| Use Licence: | This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here |
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