Title :
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
fDate :
3/1/2004 12:00:00 AM
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 Eb/N0 of 6.55 dB. At this value of Eb/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;
Journal_Title :
Communications, IEEE Transactions on
DOI :
10.1109/TCOMM.2004.823565