Qi, Hanghang and Malone, David and Subramanian, Vijay
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 .
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
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