TD-SCDMA碼域參數(shù)測量及信號處理方法研究
發(fā)布時間：2019-02-28 21:03
【摘要】：TD-SCDMA是由我國首次提出的第三代移動通信標準，在物理層核心技術上具有自主知識產權。TD-SCDMA作為一種新技術標準，相比WCDMA和cdma2000其技術的成熟性和商用經驗還不是很成熟，因此需要大量的測試工作來保證其商用的順利進行，在整個測試過程中終端射頻參數(shù)的測試是非常重要的環(huán)節(jié)。需要測試的終端射頻參數(shù)包括：通道功率、占用帶寬、鄰道功率泄漏比、誤差矢量幅度、碼域功率、峰值碼域誤差、星座圖、眼圖和比特表等。目前國內外提供TD-SCDMA測試解決方案的公司有安捷倫、泰克、中電41所等，但國內大多是專用的綜測儀，，支持對其測量功能的頻譜分析儀較少。 本文在教研室現(xiàn)有的PXI實時頻譜分析模塊硬件平臺的基礎上采用軟件編程的方式對中頻處理后的基帶IQ數(shù)據(jù)進行處理，得出誤差矢量幅度、碼域功率、峰值碼域誤差和比特表等重要參數(shù)的測量方法，給出C語言編寫參數(shù)計算函數(shù)接口。在對這些參數(shù)進行測量過程中需要用到待測信號和理想?yún)⒖夹盘�，而理想�(yún)⒖夹盘柕幕謴瓦^程則是測量過程中的難點所在，本文對物理層信號處理過程研究后得出理想?yún)⒖夹盘柕幕謴瓦^程，這也是文章的創(chuàng)新之處。本文主要工作如下： （1）首先研究物理層的核心技術傳輸信道編碼復用和解碼解復用技術。討論了各模塊的具體實現(xiàn)算法，然后建立了整個系統(tǒng)編碼復用以及解碼解復用過程仿真模型。模型中各模塊算法用C語言S函數(shù)實現(xiàn)，最后給出誤碼率等仿真結果，驗證了算法的正確性。 （2）數(shù)據(jù)流經過編碼復用后進行調制、擴頻和加擾以及插入訓練序列碼和脈沖成形處理，經頻譜搬移后在無線信道中傳輸。本文對擴頻調制環(huán)節(jié)進行分析，討論了擴頻調制環(huán)節(jié)各模塊的算法，然后給出了仿真模型，產生TD-SCDMA信號。 （3）得出了一種由待測信號恢復理想?yún)⒖夹盘柕姆椒�，并由待測信號和參考信號給出誤差矢量幅度、碼域功率、峰值碼域誤差和比特表等重要參數(shù)測量方法，用C語言編程實現(xiàn)各參數(shù)計算的函數(shù)接口，并對參數(shù)的測量算法進行了仿真驗證，最后將EVM的算法接口嵌入到上層軟件中，對其進行測試并和泰克頻譜分析儀測試結果進行對比驗證。
[Abstract]:TD-SCDMA is the third generation mobile communication standard proposed by our country for the first time, and it has independent intellectual property rights in the core technology of physical layer. As a new technology standard, TD-SCDMA is not very mature compared with WCDMA and cdma2000 in terms of maturity and commercial experience. Therefore, a great deal of testing work is needed to ensure the commercial running smoothly, and the testing of terminal RF parameters is very important in the whole testing process. The terminal RF parameters that need to be tested include: Channel power, bandwidth occupancy, adjacent channel power leakage ratio, error vector amplitude, code domain power, peak code domain error, constellation diagram, eye diagram and bit table, etc. At present, the companies providing TD-SCDMA testing solutions at home and abroad are Agilent, Tecker, CLP 41, etc., but most of them are special integrated instruments in China, and there are few spectrum analyzers supporting their measurement functions. On the basis of the existing hardware platform of PXI real-time spectrum analysis module in the teaching and research office, this paper uses software programming to process the baseband IQ data after intermediate frequency processing, and obtains the error vector amplitude and the power of the code domain. The method of measuring the important parameters such as peak code error and bit table is given, and the function interface of parameter calculation in C language is given. It is necessary to use the signal to be measured and the ideal reference signal to be used in the process of measuring these parameters, and the recovery process of the ideal reference signal is the difficult point in the measurement process. This paper studies the physical layer signal processing process and obtains the ideal reference signal recovery process, which is also the innovation of the paper. The main work of this paper is as follows: (1) the core technology of physical layer, transmission channel coding multiplexing and decode demultiplexing, is studied firstly. The implementation algorithms of each module are discussed, and then the simulation models of code multiplexing and decode demultiplexing process of the whole system are established. The algorithm of each module in the model is implemented by S function in C language. Finally, the simulation results such as bit error rate (BER) are given, and the correctness of the algorithm is verified. (2) the data stream is modulated, spread spectrum and scrambled, inserted training sequence code and pulse shaping after code multiplexing, and transmitted in wireless channel after spectrum shift. In this paper, the spread spectrum modulation link is analyzed, the algorithm of each module in the spread spectrum modulation link is discussed, and then the simulation model is given to generate the TD-SCDMA signal. (3) A method of recovering the ideal reference signal from the signal to be tested is presented. The error vector amplitude, the power of the code domain, the error of the peak code domain and the bit table are given by the signal to be measured and the reference signal. The function interface of each parameter calculation is realized by programming in C language, and the parameter measurement algorithm is simulated and verified. Finally, the algorithm interface of EVM is embedded in the upper software. The test results are compared with those of Tecker spectrum analyzer.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TN929.53
本文編號：2432169
[Abstract]:TD-SCDMA is the third generation mobile communication standard proposed by our country for the first time, and it has independent intellectual property rights in the core technology of physical layer. As a new technology standard, TD-SCDMA is not very mature compared with WCDMA and cdma2000 in terms of maturity and commercial experience. Therefore, a great deal of testing work is needed to ensure the commercial running smoothly, and the testing of terminal RF parameters is very important in the whole testing process. The terminal RF parameters that need to be tested include: Channel power, bandwidth occupancy, adjacent channel power leakage ratio, error vector amplitude, code domain power, peak code domain error, constellation diagram, eye diagram and bit table, etc. At present, the companies providing TD-SCDMA testing solutions at home and abroad are Agilent, Tecker, CLP 41, etc., but most of them are special integrated instruments in China, and there are few spectrum analyzers supporting their measurement functions. On the basis of the existing hardware platform of PXI real-time spectrum analysis module in the teaching and research office, this paper uses software programming to process the baseband IQ data after intermediate frequency processing, and obtains the error vector amplitude and the power of the code domain. The method of measuring the important parameters such as peak code error and bit table is given, and the function interface of parameter calculation in C language is given. It is necessary to use the signal to be measured and the ideal reference signal to be used in the process of measuring these parameters, and the recovery process of the ideal reference signal is the difficult point in the measurement process. This paper studies the physical layer signal processing process and obtains the ideal reference signal recovery process, which is also the innovation of the paper. The main work of this paper is as follows: (1) the core technology of physical layer, transmission channel coding multiplexing and decode demultiplexing, is studied firstly. The implementation algorithms of each module are discussed, and then the simulation models of code multiplexing and decode demultiplexing process of the whole system are established. The algorithm of each module in the model is implemented by S function in C language. Finally, the simulation results such as bit error rate (BER) are given, and the correctness of the algorithm is verified. (2) the data stream is modulated, spread spectrum and scrambled, inserted training sequence code and pulse shaping after code multiplexing, and transmitted in wireless channel after spectrum shift. In this paper, the spread spectrum modulation link is analyzed, the algorithm of each module in the spread spectrum modulation link is discussed, and then the simulation model is given to generate the TD-SCDMA signal. (3) A method of recovering the ideal reference signal from the signal to be tested is presented. The error vector amplitude, the power of the code domain, the error of the peak code domain and the bit table are given by the signal to be measured and the reference signal. The function interface of each parameter calculation is realized by programming in C language, and the parameter measurement algorithm is simulated and verified. Finally, the algorithm interface of EVM is embedded in the upper software. The test results are compared with those of Tecker spectrum analyzer.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TN929.53
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