本文選題：CoMP + 波束賦形��； 參考：《電子科技大學(xué)》2015年碩士論文

【摘要】：相比于基于CDMA的3G技術(shù),以MIMO和OFDM為技術(shù)基礎(chǔ)的現(xiàn)代無線通信系統(tǒng),擁有更高數(shù)據(jù)傳輸能力和頻譜利用率。但對(duì)于LTE系統(tǒng),正交多址的方式使得小區(qū)間干擾非常嚴(yán)重,傳統(tǒng)的小區(qū)干擾協(xié)調(diào)技術(shù)并不能有效改善小區(qū)邊緣用戶性能。為了滿足IMT-Advanced系統(tǒng)指標(biāo),LTE-Advanced引入了CoMP技術(shù),通過多個(gè)不同位置傳輸點(diǎn)的協(xié)作,共同為單個(gè)或多個(gè)用戶提供數(shù)據(jù)服務(wù),從而消除或抑制小區(qū)間干擾,增強(qiáng)小區(qū)覆蓋范圍,提高小區(qū)邊緣吞吐率,進(jìn)而提高系統(tǒng)整體容量。本文通過硬件實(shí)現(xiàn),搭建起一套CoMP無線通信演示系統(tǒng),完成對(duì)CoMP技術(shù)的功能驗(yàn)證。論文的工作主要包括以下三個(gè)部分:(1)首先介紹了CoMP的研究背景和產(chǎn)業(yè)現(xiàn)狀,同時(shí)概述了CoMP關(guān)鍵技術(shù),著重研究了聯(lián)合傳輸和波束賦形兩種傳輸模式,從物理層的實(shí)現(xiàn)技術(shù)預(yù)編碼入手,通過對(duì)各預(yù)編碼算法的仿真分析選取適合本系統(tǒng)硬件實(shí)現(xiàn)的方案。(2)接下來針對(duì)預(yù)編碼算法的硬件實(shí)現(xiàn),對(duì)其中的矩陣運(yùn)算的方案進(jìn)行分析,同時(shí)以4發(fā)4收的天線配置為例,詳細(xì)介紹了基于脈動(dòng)陣列的矩陣Cholesky分解、QR分解、矩陣求逆以及基于乘冪法迭代的主特征向量求解的算法架構(gòu),并利用硬件描述語言完成各模塊設(shè)計(jì)實(shí)現(xiàn)。通過這一部分的工作,為CoMP無線通信系統(tǒng)的基帶核心處理部分提供解決方案。(3)最后,立足于兩基站兩用戶的應(yīng)用場(chǎng)景,完成總體方案設(shè)計(jì),并搭建下行仿真鏈路進(jìn)行驗(yàn)證,為系統(tǒng)實(shí)現(xiàn)提供理論支撐。同時(shí)完成包括Turbo譯碼、MIMO檢測(cè)、調(diào)制解調(diào)等多個(gè)核心基帶模塊的硬件設(shè)計(jì),將物理層實(shí)現(xiàn)的硬件模塊搭載在現(xiàn)有的基于多FPGA的片上網(wǎng)絡(luò)多核陣列平臺(tái),完成系統(tǒng)板級(jí)調(diào)試和上下行無線空口測(cè)試。測(cè)試結(jié)果顯示,本系統(tǒng)能有效的提升小區(qū)邊緣用戶性能。
[Abstract]:Compared with CDMA based 3G technology, modern wireless communication systems based on MIMO and OFDM have higher data transmission capacity and spectrum efficiency. However, for LTE systems, orthogonal multiple access makes the cell interference very serious, and the traditional cell interference coordination technology can not effectively improve the performance of cell edge users. In order to meet the requirements of IMT-Advanced system, LTE-Advanced introduces the comp technology, which provides data service for single or multiple users through the cooperation of multiple different transmission points, thus eliminating or suppressing inter-cell interference and enhancing cell coverage. The efficiency of cell edge throughput is improved, and the overall capacity of the system is improved. In this paper, a demo system of comp wireless communication is set up through hardware implementation, and the function of comp technology is verified. The main work of the thesis includes the following three parts: (1) firstly, the background and industry status of the camp are introduced. At the same time, the key technologies of the comp are summarized, and the two transmission modes of joint transmission and beamforming are emphatically studied. Starting with the realization technology of the physical layer, through the simulation analysis of each precoding algorithm, the scheme suitable for the hardware implementation of the system is selected. (2) next, aiming at the hardware implementation of the pre-coding algorithm, the matrix operation scheme is analyzed. At the same time, taking the antenna configuration of 4 transmitters and 4 receivers as an example, the algorithm architecture of matrix Cholesky factorization QR factorization based on pulsating array, matrix inversion and principal eigenvector solution based on power method iteration is introduced in detail. And use the hardware description language to complete the design and implementation of each module. Through the work of this part, it provides a solution for the baseband core processing part of the comp wireless communication system. (3) finally, based on the application scenario of two users of two base stations, the overall scheme design is completed, and the downlink simulation is built for verification. Provide theoretical support for system implementation. At the same time, the hardware design of several core baseband modules, such as Turbo decoding MIMO detection, modulation and demodulation, is completed. The hardware modules implemented in the physical layer are carried out on the existing multi-FPGA on-chip network multi-core array platform. Complete system board level debugging and uplink and downlink wireless air port test. The test results show that the system can effectively improve the performance of edge users.
【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】：2015
【分類號(hào)】：TN929.5
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本文編號(hào)：2067477