相移键控
频率偏移
多普勒效应
多普勒频率
补偿(心理学)
计算机科学
偏移量(计算机科学)
频移
算法
电子工程
误码率
电信
光学
正交频分复用
物理
解码方法
工程类
心理学
频道(广播)
天文
精神分析
程序设计语言
作者
X. Tang,Yan Li,Li Wei,Jingwei Song,Pu Zhang,Jian Wu
摘要
This paper presents a two-stage frequency offset estimation (FOE) algorithm to compensate for Doppler frequency shift (DFS) without local oscillator (LO) laser frequency tuning. By increasing the sampling rate to 12 samples per symbol (SPS) and using a small number of pilots, the frequency offset compensation range is increased from ±Rs/8 of the conventional 4-th power FOE to ±12Rs, where Rs is symbol rate. In the offline experiment of a 2.5GBaud QPSK coherent optical communication system, this algorithm compensates simulated DFS, which ranges from -8GHz to 8GHz. The scheme achieves a sensitivity of -50.5dBm at an average bit error rate (BER) of 1E-3. The penalty with or without DFS is less than 1 dB.
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