采用隐序列估计无线光信道时直流偏置的消除

发布时间：2018-05-23 20:45

  本文选题：无线光通信 + 隐序列信道估计　； 参考：《光学精密工程》2017年10期

【摘要】：针对在无线光通信系统中采用隐序列信道估计时存在的直流偏置问题,提出了一种利用信道状态参数消除直流偏置的新的隐序列信道估计方法,并对影响系统性能的关键因素进行了研究。采用均衡后输出信噪比最大准则推导并获得了最优功率分配因子,并用仿真实验分析了该方法的均方误差、计算复杂度等性能参数以及应用该方法后系统的误码率等。仿真结果显示:采用该方法有效地减小了直流偏置对系统性能的影响,与传统隐序列信道估计方法相比,其均方误差减小了约1/2,且均衡后系统的误码性能得到了明显改善;在最佳功率分配条件下,当误码率为4×10~(-3)时,直流偏置分别为0.2和0.4对应系统的信噪比分别改善了约2dB和6dB,而计算复杂度仅增加了14.2%。
[Abstract]:In order to solve the DC bias problem in wireless optical communication systems using hidden sequence channel estimation, a new channel estimation method using channel state parameters to eliminate DC bias is proposed. The key factors affecting the performance of the system are also studied. The optimal power allocation factor is derived and obtained by using the maximum criterion of output SNR after equalization. The performance parameters such as mean square error, computational complexity and bit error rate of the system are analyzed by simulation experiments. Simulation results show that the proposed method can effectively reduce the influence of DC bias on the performance of the system. Compared with the traditional hidden sequence channel estimation method, the mean square error is reduced by about 1 / 2, and the error performance of the system is obviously improved after equalization. Under the optimal power allocation condition, when the bit error rate is 4 脳 10 ~ (-3), the signal-to-noise ratio (SNR) of the corresponding system with DC bias of 0.2 and 0.4 is improved by about 2dB and 6dB, respectively, while the computational complexity is only increased by 14.2b.
【作者单位】： 兰州理工大学计算机与通信学院;
【基金】：国家自然科学基金资助项目(No.61465007,No.61265003) 兰州理工大学博士基金资助项目(No.14-0232)
【分类号】：TN929.1
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本文编号：1926310