Title :
Pilot-Aided Log-Likelihood Ratio for LDPC Coded MPSK-OFDM Transmission
Author :
Shengjiao Cao ; Pooi-Yuen Kam ; Changyuan Yu
Author_Institution :
Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore, Singapore
Abstract :
The pilot-aided log-likelihood ratio (LLR) is derived from low-density parity-check coded coherent optical M-ary phase-shift keying orthogonal frequency division multiplexing transmission system with laser phase noise. Approximations of the metrics, which yield lower computational cost and comparable performance, are also introduced. The bit error ratio performance is tested through simulation for the proposed LLR metrics.
Keywords :
OFDM modulation; error statistics; parity check codes; phase noise; phase shift keying; LDPC coded MPSK-OFDM transmission; LLR metrics; bit error ratio performance; computational cost; laser phase noise; low-density parity-check coded coherent optical M-ary phase-shift keying OFDM transmission system; metrics approximation; orthogonal frequency division multiplexing; pilot-aided log-likelihood ratio; Log-likelihood ratio (LLR); low-density parity-check (LDPC); orthogonal frequency division multiplexing (OFDM); phase noise;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2013.2246563
