【摘要】：多調(diào)制指數(shù)連續(xù)相位調(diào)制(Multi-h Continuous Phase Modulation, Multi-h CPM)由于高效的帶寬效率和功率效率,將成為新一代無線通信中一項核心技術(shù),在未來遙測領(lǐng)域也有巨大的潛在優(yōu)勢。但是同步困難、序列檢測復雜度高,一直是限制Multi-h CPM廣泛應用的短板。本文圍繞遙測中Multi-h CPM同步及序列檢測技術(shù)開展了深入的研究,取得了如下主要研究成果： 首先,提出了一種適用于Multi-A CPM的非數(shù)據(jù)輔助的(Non Data-Aided,NDA)載波頻率同步算法。從最大似然估計理論入手,引入調(diào)制指數(shù)同步誤差概念,利用其離散且等概分布的性質(zhì),通過對邊緣聯(lián)合似然函數(shù)化簡得到載波頻偏誤差估計。該算法能適用于全響應和部分響應Multi-h CPM,而且在中低信噪比下具有良好的估計性能。在此基礎(chǔ)上,引入量化函數(shù)將算法中的濾波器沖激響應量化為矩形,降低了實現(xiàn)復雜度且性能損失較小。為了界定算法性能,推導了Multi-h CPM的載波頻偏估計MCRB限；研究了一種適用于Multi-hCPM的基于PAM分解的面向判決的載波相位同步算法,并對載波相位估計的MCRB限進行了理論推導。利用波形能量占優(yōu)的PAM波形,進行載波相位誤差估計,使算法能以較小的性能損失獲得復雜度降低。 其次,提出了一種適用于Multi-h CPM的NDA定時同步算法。通過對邊緣聯(lián)合似然函數(shù)化簡得到定時誤差估計。該算法沒有假鎖現(xiàn)象,而且對多進制L3信號,定時恢復性能逼近理想同步。多進制L=3信號的碼間串擾嚴重,針對該問題,提出了一種粗定時同步輔助細定時同步的解決方案,通過組合兩種定時同步算法的各自優(yōu)勢,在以一定的復雜度代價實現(xiàn)了精確的定時同步；研究了一種NDA調(diào)制指數(shù)同步算法,該算法不需要矢量參數(shù)估計,簡化了實現(xiàn)結(jié)構(gòu)。同時,為了改善估計性能,研究了一種基于后處理細估計的兩級級聯(lián)調(diào)制指數(shù)同步算法,通過設(shè)置合理的后處理門限值,對粗估計值進行估計保護,改善了粗估計算法似然函數(shù)對噪聲敏感而造成的性能惡化。 然后,提出了一種適用于Multi-h CPM的差分非相干序列檢測算法。該算法利用符號差分和參考相位信號,實現(xiàn)載波頻偏的消除與校正,通過多符號差分增加歐式距離,改善誤比特率性能。在此基礎(chǔ)上,引入逐幸存處理技術(shù),利用判決反饋的思想,研究了一種減少網(wǎng)格狀態(tài)的差分非相干序列檢測算法,該算法能以較小的信噪比損失,獲得顯著的復雜度降低。另外,研究了一種調(diào)制指數(shù)自同步的方法,利用序列檢測自身的分支度量信息獲得調(diào)制指數(shù)序列的估計,從而簡化了接收機結(jié)構(gòu)。 最后,設(shè)計了一套Multi-h CPM中頻收發(fā)信機系統(tǒng),在該系統(tǒng)上對提出的部分算法進行了驗證,該系統(tǒng)為Multi-h CPM在遙測領(lǐng)域?qū)嵱没�、工程化提供了初步的解決方案。
[Abstract]:Multi-Modulation exponential continuous Phase Modulation (Multi-h Continuous Phase Modulation, Multi-h CPM), due to its high bandwidth efficiency and power efficiency, will become a core technology in a new generation of wireless communication, and it will also have great potential advantages in the future telemetry field. However, the difficulty of synchronization and the high complexity of sequence detection have been the limitations of Multi-h CPM applications. In this paper, the Multi-h CPM synchronization and sequence detection techniques in telemetry are deeply studied, and the main research results are as follows: firstly, a non-data-assisted (Non Data-Aided,NDA) carrier frequency synchronization algorithm for Multi-A CPM is proposed. Based on the theory of maximum likelihood estimation, the concept of modulation exponent synchronization error is introduced, and the carrier frequency offset error estimation is obtained by simplifying the edge joint likelihood function by using its discrete and equal distribution properties. The proposed algorithm can be applied to both full and partial response Multi-h CPM, and has good estimation performance in low and low signal-to-noise ratio (SNR). On this basis, quantization function is introduced to quantize the impulse response of the filter into a rectangle, which reduces the complexity of the implementation and reduces the performance loss. In order to define the performance of the algorithm, the MCRB limit of carrier frequency offset estimation for Multi-h CPM is derived, and a Decision-oriented carrier phase synchronization algorithm based on PAM decomposition for Multi-hCPM is studied, and the MCRB limit of carrier phase estimation is derived theoretically. The carrier phase error is estimated by using the PAM waveform with the dominant waveform energy, so that the complexity of the algorithm can be reduced with less performance loss. Secondly, a NDA timing synchronization algorithm for Multi-h CPM is proposed. The timing error estimation is obtained by simplifying the edge joint likelihood function. The algorithm has no false lock phenomenon, and the timing recovery performance is close to ideal synchronization for multiary L3 signals. In view of the serious inter-symbol crosstalk of the multi-ary LN3 signal, a solution of coarse timing synchronization assisted fine timing synchronization is proposed, which combines the respective advantages of the two timing synchronization algorithms. Precise timing synchronization is realized at a certain cost of complexity, and a NDA modulation exponential synchronization algorithm is studied, which does not require vector parameter estimation and simplifies the implementation structure. At the same time, in order to improve the estimation performance, a two-stage concatenated modulation exponential synchronization algorithm based on post-processing fine estimation is studied. By setting reasonable post-processing threshold, the coarse estimation is protected. The performance deterioration of likelihood function caused by noise sensitivity in rough estimation method is improved. Then, a differential incoherent sequence detection algorithm for Multi-h CPM is proposed. The algorithm uses symbol difference and reference phase signal to eliminate and correct carrier frequency offset and increase Euclidean distance through multi-symbol difference to improve bit error rate performance. On the basis of this, a differential incoherent sequence detection algorithm with reduced grid state is studied by using the idea of decision feedback, which can reduce the SNR loss and reduce the complexity significantly. In addition, a self-synchronization method of modulation exponent is studied, and the estimation of modulation exponent sequence is obtained by using the branch metric information of the sequence detection, which simplifies the receiver structure. Finally, a set of Multi-h CPM intermediate frequency transceiver system is designed, and some of the proposed algorithms are verified on the system. The system provides a preliminary solution for the practicality and engineering of Multi-h CPM in the field of telemetry.
【學位授予單位】：中國工程物理研究院
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TN919.34

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