本文關(guān)鍵詞：恒包絡調(diào)制關(guān)鍵技術(shù)研究　出處：《西安電子科技大學》2014年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 恒包絡調(diào)制 連續(xù)相位調(diào)制 解調(diào) 載波同步

【摘要】：對于功率和帶寬雙重受限的無線信道,如深空通信、衛(wèi)星通信、移動通信及超短波電臺通信等信道,如何更高效的利用有限的頻率和功率是眾多無線通信系統(tǒng)所追求的首要目標。為了提高無線通信系統(tǒng)的有效性和可靠性,不僅需要采用高效的調(diào)制方案,還要考慮如何在低信噪比/大頻偏環(huán)境下實現(xiàn)有效的載波同步。恒包絡調(diào)制所產(chǎn)生的信號具有功率有效性高的特點,根據(jù)恒包絡調(diào)制信號的相位是否連續(xù),將恒包絡調(diào)制分為連續(xù)相位調(diào)制和非連續(xù)相位調(diào)制,由于連續(xù)相位調(diào)制(CPM)具有較高的功率利用率,更適合在無線通信信道中傳輸,因此本文針對CPM信號進行了深入的研究。在CPM信號中,成形偏移四相相移鍵控(SOQPSK)信號在功率利用率,頻帶利用率等方面具有更加優(yōu)秀的性能,因此本文首先介紹了CPM的基本概念,接著研究了SOQPSK信號的調(diào)制技術(shù),之后針對遞歸/非遞歸SOQPSK-MIL、遞歸/非遞歸SOQPSK-TG的簡化解調(diào)算法進行了研究與仿真,不僅對遞歸SOQPSK-TG信號的兩狀態(tài)判決反饋解調(diào)算法進行了深入的研究,還針對非遞歸SOQPSK-TG信號提出了兩狀態(tài)解調(diào)算法。然后針對無線信道的極低信噪比、大多普勒頻偏的環(huán)境,提出了一種適用于CPM的時頻聯(lián)合的載波同步方法,能夠達到理想的載波同步性能,該算法所用導頻開銷小、復雜度低,非常適合應用在無線通信系統(tǒng)中。最后,以TI公司的DSP芯片TMS320C5510為目標器件,對CPM的準相干解調(diào)算法進行了硬件實現(xiàn),并測試了準相干解調(diào)算法的性能。
[Abstract]:For wireless channels with dual power and bandwidth constraints, such as deep space communications, satellite communications, mobile communications and ultrashort radio communications, etc. How to make more efficient use of limited frequency and power is the primary goal pursued by many wireless communication systems. In order to improve the effectiveness and reliability of wireless communication systems, it is not only necessary to adopt efficient modulation schemes. We also consider how to realize effective carrier synchronization in low SNR / large frequency offset environment. The signal generated by constant envelope modulation has the characteristics of high power efficiency, according to whether the phase of the constant envelope modulation signal is continuous. The constant envelope modulation is divided into continuous phase modulation and discontinuous phase modulation. Because CPM (continuous phase modulation) has high power efficiency, it is more suitable for transmission in wireless communication channel. In the CPM signal, the shaping shift four-phase shift keying (SOQPSK) signal is used in power utilization. Frequency band efficiency has better performance, so this paper first introduces the basic concept of CPM, and then studies the modulation technology of SOQPSK signal. Then, the simplified demodulation algorithm of recursive / non-recursive SOQPSK-MIL, recursive / non-recursive SOQPSK-TG is studied and simulated. Not only the two-state decision feedback demodulation algorithm of recursive SOQPSK-TG signal is studied deeply. A two-state demodulation algorithm is also proposed for non-recursive SOQPSK-TG signals. Then, for the very low signal-to-noise ratio (SNR) of wireless channel and the large Doppler frequency offset environment. A carrier synchronization method suitable for CPM is proposed, which can achieve ideal carrier synchronization performance. The proposed algorithm has low pilot overhead and low complexity. It is very suitable for wireless communication system. Finally, the quasi-coherent demodulation algorithm of CPM is implemented by hardware with TMS320C5510 chip of TI Company as the target device. The performance of the quasi-coherent demodulation algorithm is tested.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN911.3

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