本文選題：正交空頻分組碼 + Matlab　； 參考：《電子科技大學》2014年碩士論文

【摘要】：近年來,M IMO技術(shù)備受矚目,在新一代移動通信中占據(jù)著重要位置。MIMO技術(shù)是一種能夠有效改善通信質(zhì)量的多天線技術(shù),從空間、時間、頻域三個角度開發(fā)利用了空間資源和頻譜資源。在不增加頻譜資源或者不增大天線發(fā)射功率的前提下,提高了傳輸效率,增加了信道容量。正交空頻分組碼技術(shù)是MIMO技術(shù)中的一種非常重要的實現(xiàn)方式,采用在不同頻率、不同天線上發(fā)射數(shù)據(jù)多個副本的方式,利用頻域和空間分集提高了數(shù)據(jù)傳輸?shù)目煽啃�。因�?論文設計了一種正交空頻分組碼的波形,并在團隊自主研發(fā)的軟件無線電平臺上完成了演示驗證。論文主要研究工作包括:第一,正交空頻分組碼波形的設計。論文設計了一種可以實際應用的正交空頻分組碼波形。論文設計的波形帶寬為2.73MHz,數(shù)據(jù)源速率為980kbps,幀速率為2.24Mbps;調(diào)制方式采用CRC校驗碼,1/3碼率卷積編碼,交織,QPSK調(diào)制及OSFB C編譯碼等。論文將正交空頻分組碼信號處理流程劃分為發(fā)射單元、中射頻處理單元、同步單元、檢測單元四個部分,對每部分的實現(xiàn)算法做了詳細的說明,并給出了Matlab仿真結(jié)果。仿真結(jié)果表明:理想信道估計下的性能與理論曲線相差在1dB范圍內(nèi),而LS信道估計下的性能惡化在3dB以內(nèi)。第二,正交空頻分組碼波形的圖形化開發(fā)。論文運用圖形化開發(fā)工具System Generator完成了正交空頻分組碼波形的開發(fā)。實現(xiàn)了正交空頻分組碼波形的硬件仿真,包括CRC校驗、卷積編碼和交織、QPSK調(diào)制、OSFBC編碼、OFD M調(diào)制、同步、頻偏估計、信道估計及OSFB C譯碼等。并且完成了發(fā)射端的時序驗證、接收端同步捕獲的驗證、接收端的時序驗證及CRC校驗結(jié)果驗證等;最后生成bit文件以實現(xiàn)上板調(diào)試。第三,正交空頻分組碼波形的演示驗證。論文給出了正交空頻分組碼波形的發(fā)射機、接收機的工作流程及演示平臺結(jié)構(gòu)。利用團隊自主研發(fā)的軟件無線電平臺,完成了正交空頻分組碼波形通信性能的測試及分析。實測結(jié)果表明:在墻體干擾、人員干擾、機器(如電腦、頻譜儀等設備)干擾的室內(nèi)環(huán)境下得到的性能測試結(jié)果與M atl ab的仿真結(jié)果誤差在2dB以內(nèi)。綜上,論文完成了正交空頻分組碼波形的設計、實現(xiàn)及驗證。論文中實現(xiàn)的方案具有可實現(xiàn)性,可直接應用于下一代移動通信系統(tǒng)、無線局域網(wǎng)、物聯(lián)網(wǎng)等場景,提高系統(tǒng)的發(fā)射分集性能。同時本項目也為通信系統(tǒng)的可視化、圖形化開發(fā)提供了參考。
[Abstract]:In recent years, MIMO technology has attracted much attention. It occupies an important position in the new generation of mobile communication. MIMO technology is a kind of multi-antenna technology that can effectively improve the communication quality. Space resources and spectrum resources are exploited from three angles in frequency domain. The transmission efficiency is improved and the channel capacity is increased without increasing the spectrum resource or the transmit power of the antenna. Orthogonal space-frequency block code technology is one of the most important methods in MIMO technology. By transmitting multiple replicas of data at different frequencies and antennas, the reliability of data transmission is improved by using frequency domain and spatial diversity. Therefore, a waveform of orthogonal space-frequency block codes is designed and demonstrated on the software radio platform independently developed by the team. The main research work includes: first, the waveform design of orthogonal space frequency block codes. In this paper, a practical waveform of orthogonal space frequency block codes is designed. The designed waveform bandwidth is 2.73MHz, the data source rate is 980kbpsand the frame rate is 2.24Mbps.The modulation mode adopts CRC check code / 1 / 3 bit rate convolution coding, interleaved QPSK modulation and OSFB C coding and so on. In this paper, the signal processing flow of orthogonal space-frequency block code is divided into four parts: transmitting unit, radio frequency processing unit, synchronous unit and detection unit. The realization algorithm of each part is explained in detail, and the simulation results of Matlab are given. The simulation results show that the performance difference between the ideal channel estimation and the theoretical curve is in the range of 1dB, while the performance of LS channel estimation is worse than 3dB. Second, the graphic development of orthogonal space frequency block code waveform. In this paper, the waveform of orthogonal space frequency block codes is developed by using the graphical development tool system Generator. Hardware simulation of quadrature space-frequency block codes is implemented, including CRC verification, convolution coding and interleaved QPSK modulation / OSFBC coded OFD M modulation, synchronization, frequency offset estimation, channel estimation and OSFB C decoding. The timing verification of the transmitter, the synchronous acquisition of the receiver, the timing verification of the receiver and the verification of the results of the CRC verification are completed. Finally, the bit file is generated to realize the debugging of the upper board. Third, the demonstration and verification of orthogonal space frequency block code waveform. In this paper, the work flow of the transmitter, receiver and the structure of the demonstration platform of the orthogonal space-frequency block code waveform are presented. Based on the software radio platform developed by the team, the waveform communication performance of orthogonal space-frequency block codes is tested and analyzed. The measured results show that the error between the performance test results and the simulation results of M atl ab is less than 2 dB under the indoor environment of wall interference, human interference, machine interference (such as computer, spectrometer, etc.). In summary, the design, implementation and verification of orthogonal space frequency block code waveform are completed. The scheme can be directly used in the next generation mobile communication system, wireless local area network, Internet of things and so on, and improve the transmission diversity performance of the system. At the same time, this project also provides a reference for the visual and graphical development of communication system.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.5

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