TD-LTE-A上行鏈路中檢測(cè)技術(shù)的研究與實(shí)現(xiàn)
發(fā)布時(shí)間：2019-05-27 12:16
【摘要】：科技和社會(huì)的不斷進(jìn)步推動(dòng)了移動(dòng)通信技術(shù)持續(xù)演進(jìn),更高速更便捷的移動(dòng)通信的需求催生了LTE及其演進(jìn)技術(shù)。單載波頻分多址(SC-FDMA)作為L(zhǎng)TE中上行的傳輸方案,一方面可以利用OFDM子載波之間的正交性,提高頻譜利用率;同時(shí)由于單載波特性可以降低信號(hào)的峰均功率比。在LTE系統(tǒng)中如何克服無(wú)線信道的影響,消除多徑效應(yīng)和多普勒頻移等帶來(lái)的各種干擾和信號(hào)損失非常重要,如何在接收端高效且準(zhǔn)確地恢復(fù)發(fā)送信號(hào),保證信號(hào)的可靠傳輸成為L(zhǎng)TE研究重點(diǎn)�；诖�,本文對(duì)TD-LTE-A上行鏈路中的信號(hào)檢測(cè)技術(shù)進(jìn)行了研究與分析。首先,本文對(duì)TD-LTE-A上行鏈路中的關(guān)鍵技術(shù)進(jìn)行了介紹。主要介紹了上行鏈路中的SC-FDMA特性和生成方式,同時(shí)介紹了上行MIMO技術(shù),包括單用戶SIMO、空分復(fù)用和多用戶虛擬MIMO等傳輸方式。此外對(duì)LTE中采用的仿真信道模型進(jìn)行了介紹。其次,本文分別對(duì)單用戶SIMO系統(tǒng)和MIMO系統(tǒng)中的檢測(cè)技術(shù)進(jìn)行了深入的研究。對(duì)于SIMO系統(tǒng)的檢測(cè)主要是基于分集合并思想,包括最大比合并(MRC)算法以及干擾抑制合并(IRC)算法,此外本文還研究了基于Turbo譯碼軟信息反饋的Turbo-MRC檢測(cè)算法。仿真結(jié)果表明,利用Turbo譯碼軟信息進(jìn)行反饋迭代的Turbo-MRC算法相對(duì)于傳統(tǒng)MRC算法能夠獲得一定的性能增益。對(duì)于MIMO系統(tǒng)的檢測(cè),本文介紹了線性檢測(cè)算法、傳統(tǒng)的干擾消除檢測(cè)算法和基于Turbo譯碼軟信息反饋的軟干擾消除檢測(cè)算法,其中干擾消除包括串行干擾消除和并行干擾消除兩種方式。通過(guò)搭建的LTE上行鏈路,采用相應(yīng)的仿真信道模型,本文對(duì)上面介紹的各種檢測(cè)算法進(jìn)行了仿真研究。最后,本文選擇了MMSE檢測(cè)算法進(jìn)行了FPGA設(shè)計(jì)。首先對(duì)MMSE檢測(cè)算法的硬件實(shí)現(xiàn)結(jié)構(gòu)進(jìn)行了分析,給出定點(diǎn)仿真模型,然后通過(guò)ISE和Modelsim對(duì)硬件電路進(jìn)行功能仿真,然后進(jìn)行板級(jí)測(cè)試。電路的時(shí)鐘可以達(dá)到123.93MHz,同時(shí)仿真波形和抓取的電路實(shí)際數(shù)據(jù)的分析結(jié)果證明了電路設(shè)計(jì)的正確性,硬件實(shí)現(xiàn)結(jié)果滿足設(shè)計(jì)需求。
[Abstract]:The continuous progress of science and technology and society has promoted the continuous evolution of mobile communication technology, and the demand for faster and more convenient mobile communication has given birth to LTE and its evolution technology. As the uplink transmission scheme in LTE, single carrier frequency division multiple access (SC-FDMA) can make use of the orthogonality between OFDM subcarriers to improve the spectrum efficiency, and at the same time, the peak-to-average power ratio of the signal can be reduced due to the characteristics of single carrier. How to overcome the influence of wireless channel and eliminate all kinds of interference and signal loss caused by multi-path effect and Doppler shift in LTE system is very important. How to recover the transmitted signal efficiently and accurately at the receiver. To ensure the reliable transmission of the signal has become the focus of LTE research. Based on this, the signal detection technology in TD-LTE-A uplink is studied and analyzed in this paper. First of all, this paper introduces the key technologies in TD-LTE-A uplink. This paper mainly introduces the characteristics and generation methods of SC-FDMA in uplink, and introduces the uplink MIMO technology, including single-user SIMO, space division reuse and multi-user virtual MIMO. In addition, the simulation channel model used in LTE is introduced. Secondly, the detection technology in single-user SIMO system and MIMO system is deeply studied in this paper. The detection of SIMO system is mainly based on the idea of diversity merging, including maximum ratio merge (MRC) algorithm and interference suppression merge (IRC) algorithm. In addition, this paper also studies the Turbo-MRC detection algorithm based on Turbo decoding soft information feedback. The simulation results show that the Turbo-MRC algorithm using Turbo decoding soft information for feedback iteration can obtain a certain performance gain compared with the traditional MRC algorithm. For the detection of MIMO system, this paper introduces the linear detection algorithm, the traditional interference cancellation detection algorithm and the soft interference cancellation detection algorithm based on Turbo decoding soft information feedback. Interference cancellation includes serial interference cancellation and parallel interference cancellation. Through the LTE uplink and the corresponding simulation channel model, various detection algorithms introduced above are simulated and studied in this paper. Finally, the MMSE detection algorithm is selected for FPGA design. Firstly, the hardware implementation structure of MMSE detection algorithm is analyzed, and the fixed-point simulation model is given. Then the hardware circuit is simulated by ISE and Modelsim, and then the board level test is carried out. The clock of the circuit can reach 123.93MHz. At the same time, the analysis results of the simulation waveform and the actual data of the captured circuit prove the correctness of the circuit design, and the hardware implementation results meet the design requirements.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.5
本文編號(hào)：2486136
[Abstract]:The continuous progress of science and technology and society has promoted the continuous evolution of mobile communication technology, and the demand for faster and more convenient mobile communication has given birth to LTE and its evolution technology. As the uplink transmission scheme in LTE, single carrier frequency division multiple access (SC-FDMA) can make use of the orthogonality between OFDM subcarriers to improve the spectrum efficiency, and at the same time, the peak-to-average power ratio of the signal can be reduced due to the characteristics of single carrier. How to overcome the influence of wireless channel and eliminate all kinds of interference and signal loss caused by multi-path effect and Doppler shift in LTE system is very important. How to recover the transmitted signal efficiently and accurately at the receiver. To ensure the reliable transmission of the signal has become the focus of LTE research. Based on this, the signal detection technology in TD-LTE-A uplink is studied and analyzed in this paper. First of all, this paper introduces the key technologies in TD-LTE-A uplink. This paper mainly introduces the characteristics and generation methods of SC-FDMA in uplink, and introduces the uplink MIMO technology, including single-user SIMO, space division reuse and multi-user virtual MIMO. In addition, the simulation channel model used in LTE is introduced. Secondly, the detection technology in single-user SIMO system and MIMO system is deeply studied in this paper. The detection of SIMO system is mainly based on the idea of diversity merging, including maximum ratio merge (MRC) algorithm and interference suppression merge (IRC) algorithm. In addition, this paper also studies the Turbo-MRC detection algorithm based on Turbo decoding soft information feedback. The simulation results show that the Turbo-MRC algorithm using Turbo decoding soft information for feedback iteration can obtain a certain performance gain compared with the traditional MRC algorithm. For the detection of MIMO system, this paper introduces the linear detection algorithm, the traditional interference cancellation detection algorithm and the soft interference cancellation detection algorithm based on Turbo decoding soft information feedback. Interference cancellation includes serial interference cancellation and parallel interference cancellation. Through the LTE uplink and the corresponding simulation channel model, various detection algorithms introduced above are simulated and studied in this paper. Finally, the MMSE detection algorithm is selected for FPGA design. Firstly, the hardware implementation structure of MMSE detection algorithm is analyzed, and the fixed-point simulation model is given. Then the hardware circuit is simulated by ISE and Modelsim, and then the board level test is carried out. The clock of the circuit can reach 123.93MHz. At the same time, the analysis results of the simulation waveform and the actual data of the captured circuit prove the correctness of the circuit design, and the hardware implementation results meet the design requirements.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.5
【參考文獻(xiàn)】
相關(guān)期刊論文 前2條
1 董慶龍;李亞麟;倪衛(wèi)明;;LTE上行信道的八天線干擾抑制合并技術(shù)[J];電訊技術(shù);2012年07期
2 馬萬(wàn)治;趙宏志;于輝越;王俊;唐友喜;;LTE上行通信鏈路中Wi-Fi同頻干擾的一種抑制方法[J];通信學(xué)報(bào);2012年08期
，本文編號(hào)：2486136
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