本文選題：無線光通信 + 隱序列信道估計　； 參考：《光學(xué)精密工程》2017年10期

【摘要】：針對在無線光通信系統(tǒng)中采用隱序列信道估計時存在的直流偏置問題,提出了一種利用信道狀態(tài)參數(shù)消除直流偏置的新的隱序列信道估計方法,并對影響系統(tǒng)性能的關(guān)鍵因素進(jìn)行了研究。采用均衡后輸出信噪比最大準(zhǔn)則推導(dǎo)并獲得了最優(yōu)功率分配因子,并用仿真實驗分析了該方法的均方誤差、計算復(fù)雜度等性能參數(shù)以及應(yīng)用該方法后系統(tǒng)的誤碼率等。仿真結(jié)果顯示:采用該方法有效地減小了直流偏置對系統(tǒng)性能的影響,與傳統(tǒng)隱序列信道估計方法相比,其均方誤差減小了約1/2,且均衡后系統(tǒng)的誤碼性能得到了明顯改善;在最佳功率分配條件下,當(dāng)誤碼率為4×10~(-3)時,直流偏置分別為0.2和0.4對應(yīng)系統(tǒng)的信噪比分別改善了約2dB和6dB,而計算復(fù)雜度僅增加了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.
【作者單位】： 蘭州理工大學(xué)計算機(jī)與通信學(xué)院;
【基金】：國家自然科學(xué)基金資助項目(No.61465007,No.61265003) 蘭州理工大學(xué)博士基金資助項目(No.14-0232)
【分類號】：TN929.1
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本文編號：1926310