Title :
Parity Check Encoded QPSK for Rate Adaptation in Coherent DSP-Based Receivers
Author :
Pfau, Timo ; Lee, Jeyull ; Kaneda, Noriaki
Author_Institution :
Bell Labs., Alcatel-Lucent, Murray Hill, NJ, USA
Abstract :
An ultrashort rate-1/2 parity check (PC) code is used to switch the net data rate of a coherent quadrature phase shift keying (QPSK) transmission system to the equivalent of a binary phase shift keying (BPSK) system. Simulation results of PC encoded-QPSK show an improvement in receiver sensitivity of 0.8 dB over BPSK at the soft-FEC threshold of BER = 2×10-2. In addition, the code allows establishing an absolute phase reference at the receiver; i.e., differential coding is not required.
Keywords :
digital signal processing chips; parity check codes; quadrature phase shift keying; receivers; BPSK system; PC code; QPSK transmission system; absolute phase reference; binary phase shift keying; coherent DSP based receivers; coherent quadrature phase shift keying; differential coding; parity check encoded QPSK; rate adaptation; receiver sensitivity; Binary phase shift keying; Bit error rate; Decoding; Parity check codes; Receivers; Sensitivity; Digital signal processing; forward error correction; modulation coding; optical fiber communication; phase estimation;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2014.2328377
