【摘要】：連續(xù)相位調(diào)制(Continuous Phase Modulation,CPM)具有相位連續(xù)和恒包絡(luò)的特性,其頻譜較為緊湊,頻帶利用率高,系統(tǒng)可以使用效率較高且成本較低的非線性功率放大器,大大降低了設(shè)備成本和功耗。同時,CPM是一種非線性調(diào)制,信號本身引入記憶性,其調(diào)制過程可以等效為一個編碼器和一個線性調(diào)制器的級聯(lián),因而可以結(jié)合信道編碼技術(shù)對信號進(jìn)行迭代檢測。在實際無線通信系統(tǒng)中,CPM通過多徑衰落信道時,會引入碼間干擾(Inter Symbol Interference,ISI)。通常采用低復(fù)雜度的頻域均衡技術(shù)來降低碼間串?dāng)_對系統(tǒng)的影響。但是對于多徑時變信道,一幀數(shù)據(jù)內(nèi)離散信道沖擊響應(yīng)是變化的,采用頻域均衡的系統(tǒng)性能較差。因此本文主要研究針對時變信道下的CPM信號迭代均衡技術(shù)。本文首先闡述了課題的研究背景及意義,分析了連續(xù)相位調(diào)制和恒包絡(luò)正交頻分復(fù)用(Constant Envelope Orthogonal Frequency Division Multiplexing,CE-OFDM)兩種恒包絡(luò)調(diào)制的研究現(xiàn)狀,并簡要概括了本文主要研究內(nèi)容及結(jié)構(gòu)安排。第二章主要研究了時變信道下基于逐幸存處理(Per-Survivor Processing,PSP)的CPM自適應(yīng)均衡算法,并且提出了一種適合快時變信道的自適應(yīng)跟蹤算法。本章首先介紹了CPM信號的調(diào)制原理,相位狀態(tài)以及信道模型。然后研究了時變信道下CPM均衡算法,結(jié)合CPM信號本身的特性采用自適應(yīng)逐幸存處理的均衡算法。并且與傳統(tǒng)的時域均衡進(jìn)行了比較。隨后仿真得到了時變信道下的逐幸存處理均衡算法與傳統(tǒng)時域均衡算法的性能,并且給出兩種均衡算法的性能對比。第三章主要研究時變信道下CPM自適應(yīng)迭代檢測(Adaptive Iterative Detection,AID)算法。本章首先根據(jù)CPM信號的解調(diào)特性,研究CPM信號的自適應(yīng)逐幸存處理軟解調(diào)算法。然后根據(jù)現(xiàn)有的迭代檢測模型,實現(xiàn)連續(xù)相位調(diào)制的自適應(yīng)迭代檢測。并且研究單徑時變信道和多徑時變信道環(huán)境下的仿真性能。由于隨著多徑數(shù)量的增加使得CPM的軟解調(diào)復(fù)雜度增大,因此本文進(jìn)一步研究了低復(fù)雜度的軟解調(diào)算法,并給出算法復(fù)雜度分析和性能仿真。第四章主要研究CE-OFDM技術(shù)在毫米波信道下的解調(diào)算法及性能。本章首先介紹CE-OFDM的調(diào)制解調(diào)原理,并給出CE-OFDM在加性高斯白噪聲(Additive White Gaussian Noise,AWGN)下接收端采用不同的參數(shù)的解調(diào)模塊的仿真性能。然后給出多徑信道下CE-OFDM的性能分析。最后仿真分析了在802.11ad信道下CE-OFDM的性能。第五章主要總結(jié)了本文的主要貢獻(xiàn)。并且簡述了這兩種恒包絡(luò)調(diào)制所面臨的問題和困難,給出了進(jìn)一步的研究建議。
[Abstract]:Continuous phase modulation (Continuous Phase Modulation,CPM) has the characteristics of continuous phase and constant envelope, its frequency spectrum is compact, frequency band efficiency is high, and the system can use high efficiency and low cost nonlinear power amplifier. The equipment cost and power consumption are greatly reduced. At the same time, CPM is a nonlinear modulation, the signal itself introduces memory, its modulation process can be equivalent to a coder and a linear modulator cascade, so it can be combined with channel coding technology to iteratively detect the signal. In the actual wireless communication system, CPM will introduce intersymbol interference (Inter Symbol Interference,ISI) in multipath fading channel. Low complexity frequency domain equalization technique is usually used to reduce the influence of inter-symbol crosstalk on the system. However, for multipath time-varying channels, the impulse response of discrete channel in a frame is variable, and the performance of the system using frequency domain equalization is poor. Therefore, this paper focuses on iterative equalization of CPM signals in time-varying channels. In this paper, the background and significance of the research are described, and the research status of continuous phase modulation and constant envelope orthogonal frequency division multiplexing (Constant Envelope Orthogonal Frequency Division Multiplexing,CE-OFDM) is analyzed. The main contents and structure of this paper are briefly summarized. In chapter 2, the CPM adaptive equalization algorithm based on Per-Survivor Processing,PSP is studied, and an adaptive tracking algorithm for fast time-varying channel is proposed. In this chapter, the modulation principle, phase state and channel model of CPM signal are introduced. Then, the CPM equalization algorithm in time-varying channel is studied, and the adaptive one by one survival equalization algorithm is adopted in combination with the characteristics of CPM signal itself. And compared with the traditional time domain equalization. Then the simulation results show that the performance of the successive equalization algorithm in time-varying channel is compared with that of the traditional time-domain equalization algorithm, and the performance of the two equalization algorithms is compared. In chapter 3, CPM adaptive iterative detection (Adaptive Iterative Detection,AID) algorithm in time-varying channel is studied. In this chapter, according to the demodulation characteristics of CPM signal, we study the adaptive one-survivor soft demodulation algorithm of CPM signal. Then adaptive iterative detection of continuous phase modulation is realized according to the existing iterative detection model. The simulation performance of single-path time-varying channel and multi-path time-varying channel is studied. Because the complexity of soft demodulation of CPM increases with the increase of the number of multipath, this paper further studies the low-complexity soft demodulation algorithm, and gives the complexity analysis and performance simulation of the algorithm. In chapter 4, the demodulation algorithm and performance of CE-OFDM in millimeter-wave channel are studied. In this chapter, the principle of modulation and demodulation of CE-OFDM is introduced, and the simulation performance of demodulation module with different parameters at the receiver of CE-OFDM under additive Gao Si white noise (Additive White Gaussian Noise,AWGN is given. Then the performance analysis of CE-OFDM in multipath channel is given. Finally, the performance of CE-OFDM in 802.11ad channel is simulated and analyzed. The fifth chapter summarizes the main contributions of this paper. The problems and difficulties faced by these two kinds of constant envelope modulation are briefly described, and further research suggestions are given.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TN851

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