本文關(guān)鍵詞： 連續(xù)相位調(diào)制 DVB-RCS2 小波脊線 符號(hào)速率估計(jì) Laurent分解 定時(shí)同步 非對(duì)稱非正交指數(shù)分解 軟輸入軟輸出　出處：《解放軍信息工程大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：連續(xù)相位調(diào)制(Continuous Phase Modulation,CPM)由于具有很高的頻譜利用率和功率利用率,在衛(wèi)星通信系統(tǒng)中的應(yīng)用十分廣泛。2011年公布的DVB-RCS2協(xié)議將CPM引入其回傳鏈路傳輸模式中,調(diào)制參數(shù)更加靈活多樣,對(duì)CPM信號(hào)接收技術(shù)提出了更高的要求。本文基于DVB-RCS2協(xié)議,研究實(shí)現(xiàn)了協(xié)議規(guī)定下CPM信號(hào)的符號(hào)速率估計(jì)、定時(shí)同步和解調(diào)譯碼算法。論文工作為作者所在實(shí)驗(yàn)室承擔(dān)的某重點(diǎn)項(xiàng)目的一部分。本文的主要工作和創(chuàng)新點(diǎn)概括如下:1、分析了DVB-RCS2協(xié)議中回傳鏈路的CPM傳輸模式,通過解析信令和突發(fā)波形生成過程,明確了協(xié)議規(guī)定下CPM信號(hào)的調(diào)制參數(shù)特點(diǎn)和接收關(guān)鍵步驟。2、提出了一種基于小波脊線的CPM信號(hào)符號(hào)速率估計(jì)算法。通過研究CPM信號(hào)的小波脊線特征,對(duì)基帶CPM信號(hào)的小波脊線進(jìn)行濾波處理,再做FFT運(yùn)算得到離散譜線,根據(jù)離散譜線與符號(hào)速率的關(guān)系,實(shí)現(xiàn)CPM信號(hào)符號(hào)速率的估計(jì)。針對(duì)DVB-RCS2協(xié)議規(guī)定信號(hào)進(jìn)行仿真實(shí)驗(yàn),結(jié)果表明,該算法適用于回傳鏈路的短突發(fā)和低信噪比環(huán)境,與現(xiàn)有算法相比,受載波頻偏、相偏和調(diào)制指數(shù)影響更小。3、提出了一種低復(fù)雜度的CPM信號(hào)聯(lián)合定時(shí)和序列檢測(cè)算法。在基于最大似然的判決反饋結(jié)構(gòu)基礎(chǔ)上,首先通過Laurent分解簡(jiǎn)化前端匹配濾波器組,降低Viterbi算法所需分支度量的計(jì)算復(fù)雜度,進(jìn)一步利用減少狀態(tài)序列檢測(cè)算法簡(jiǎn)化后端狀態(tài)轉(zhuǎn)移網(wǎng)格,改進(jìn)判決反饋結(jié)構(gòu),實(shí)現(xiàn)了CPM信號(hào)的定時(shí)同步和序列檢測(cè)的聯(lián)合優(yōu)化。針對(duì)DVB-RCS2協(xié)議信號(hào)進(jìn)行仿真實(shí)驗(yàn),表明該算法相較現(xiàn)有算法更適用于多進(jìn)制部分響應(yīng)CPM信號(hào),收斂速度更快,精度更高。4、提出了一種低復(fù)雜度的串行級(jí)聯(lián)CPM信號(hào)解調(diào)譯碼算法。在傳統(tǒng)的軟輸入軟輸出迭代譯碼算法基礎(chǔ)上,利用非對(duì)稱非正交指數(shù)分解近似表達(dá)參考信號(hào),修正串行級(jí)聯(lián)結(jié)構(gòu)中CPM內(nèi)碼分支度量的計(jì)算,在保證提供充分統(tǒng)計(jì)信息的基礎(chǔ)上降低運(yùn)算復(fù)雜度。針對(duì)DVB-RCS2協(xié)議信號(hào)進(jìn)行仿真實(shí)驗(yàn),表明該算法與現(xiàn)有算法相比,在解調(diào)性能損失更小的基礎(chǔ)上運(yùn)算復(fù)雜度更低。5、實(shí)現(xiàn)了CPM信號(hào)參數(shù)估計(jì)和解調(diào)譯碼的系統(tǒng)功能模塊。依托硬件平臺(tái),完成了所研算法的軟件實(shí)現(xiàn),并利用實(shí)驗(yàn)信號(hào)進(jìn)行性能測(cè)試,結(jié)果表明本文算法能夠達(dá)到預(yù)期效果,為DVB-RCS2信號(hào)接收系統(tǒng)的實(shí)現(xiàn)打下基礎(chǔ)。
[Abstract]:Continuous Phase Modulation (CPM) is widely used in satellite communication systems because of its high spectral efficiency and power efficiency. The DVB-RCS2 protocol published in 2011 introduces CPM into its return link transmission mode, and the modulation parameters are more flexible. In this paper, based on the DVB-RCS2 protocol, the symbol rate estimation of the CPM signal under the protocol is studied and realized. Timing synchronization and demodulation decoding algorithms. This paper is a part of a key project in the laboratory. The main work and innovation of this paper are summarized as follows: 1. The CPM transmission mode of the return link in DVB-RCS2 protocol is analyzed. By analyzing signaling and burst waveform generation, The characteristics of modulation parameters and the key steps of receiving CPM signal under protocol are defined. A symbol rate estimation algorithm for CPM signal based on wavelet ridge is proposed. The wavelet ridge feature of CPM signal is studied. The wavelet ridge of baseband CPM signal is filtered, then the discrete spectral line is obtained by FFT operation. According to the relation between discrete spectral line and symbol rate, the symbol rate of CPM signal is estimated. The simulation experiment is carried out for the signal specified in DVB-RCS2 protocol. The results show that the proposed algorithm is suitable for short burst and low signal-to-noise ratio (SNR) environments of the return link. The phase offset and modulation exponent are less affected. 3. A low complexity joint timing and sequence detection algorithm for CPM signals is proposed. Based on the decision feedback structure based on maximum likelihood, the front-end matched filter banks are simplified by Laurent decomposition. The computational complexity of the branch metric required by Viterbi algorithm is reduced, and the reduced state sequence detection algorithm is further used to simplify the back-end state transition grid, and the decision feedback structure is improved. The timing synchronization of CPM signal and the joint optimization of sequence detection are realized. The simulation results of DVB-RCS2 protocol signal show that the proposed algorithm is more suitable than the existing algorithms for multi-ary partial response to CPM signal, and the convergence speed is faster. A low complexity serial concatenated CPM signal demodulation and decoding algorithm is proposed. Based on the traditional soft-input soft-output iterative decoding algorithm, the asymmetric nonorthogonal exponential decomposition is used to approximate express the reference signal. The computation of CPM internal code branch metric in serial concatenated structure is modified, and the computational complexity is reduced on the basis of guaranteeing sufficient statistical information. The simulation experiments on DVB-RCS2 protocol signal show that the proposed algorithm is compared with the existing algorithms. On the basis of less performance loss of demodulation, the computational complexity is lower. 5. The system function module of parameter estimation and demodulation and decoding of CPM signal is realized. Based on hardware platform, the software implementation of the algorithm is completed. The experimental results show that the proposed algorithm can achieve the desired results and lay the foundation for the realization of the DVB-RCS2 signal receiving system.
【學(xué)位授予單位】：解放軍信息工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN911.25

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