Impact of Nonideal Phase Reference on Soft Decoding of Differentially Encoded Modulation

被引：15

作者：

Magarini, Maurizio ^{[1
]}

Barletta, Luca ^{[1
]}

Spalvieri, Arnaldo ^{[1
]}

Leven, Andreas ^{[2
]}

Pepe, Marianna ^{[3
]}

Gavioli, Giancarlo ^{[3
]}

机构：

[1] Politecn Milan, Dipartimento Elettron & Informaz, I-20133 Milan, Italy

[2] Alcatel Lucent, Bell Labs, D-70435 Stuttgart, Germany

[3] Alcatel Lucent Italia, I-20871 Vimercate, Italy

来源：

IEEE PHOTONICS TECHNOLOGY LETTERS | 2012年 / 24卷 / 23期

关键词：

Coded modulations; differential encoding; optical communications; quadrature amplitude modulation (QAM); CARRIER RECOVERY; NOISE; SYSTEMS; CODES;

D O I：

10.1109/LPT.2012.2224861

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The performance of coded modulation schemes based on the concatenation of a forward-error correction (FEC) code and differentially encoded quadrature amplitude modulations (QAMs) in the presence of Wiener phase noise is considered. Log-likelihood ratios, required to perform soft decoding, are first derived for the case in which the phase of the received carrier is assumed to be perfectly known, and then used to obtain the performance for nonideal reference of phase. Simulation results of the post-FEC bit-error rate are presented for a near-Shannon limit low-density parity check code with an overhead of 20%. The performance loss, compared to ideal coherent demodulation, is evaluated for two different linewidths of the phase noise in case of quadrature-phase shift keying and 16-QAM transmission.

引用

页码：2179 / 2182

页数：4

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