【摘要】：近年來,CRAHNs網(wǎng)絡因為其通信可靠性高的特點得到了廣泛研究,但是它對信號的發(fā)送功率有一定要求且無法有效抑制多徑效應,而大規(guī)模MIMO技術可以顯著提高系統(tǒng)的能量效率和頻譜效率。因此本文將大規(guī)模MIMO技術與CRAHNs網(wǎng)絡相結合,對該系統(tǒng)中的波束形成技術作了深入的研究,包括波束形成發(fā)送和波束形成接收技術,主要解決系統(tǒng)中存在的多徑衰落和多節(jié)點干擾問題,提高網(wǎng)絡的通信性能并降低能量消耗。(1)寬帶波束形成接收技術。將窄帶波束形成的信號接收模型和準則推廣到寬帶,給出了寬帶波束形成的處理方法和數(shù)學表達式,并針對常規(guī)的波束形成算法運用到天線陣旁瓣較高的缺點,提出了可以應用于寬帶的旁瓣約束優(yōu)化波束形成算法,并仿真出了波束響應圖,驗證了該算法可以有效增強期望信號,抑制干擾信號,并可以降低旁瓣波束響應值。(2)與OFDM相結合以對抗多徑的波束形成接收技術。將波束形成技術與OFDM系統(tǒng)相結合,目標是對抗或利用多徑。介紹了波束形成應用到OFDM系統(tǒng)中的兩種實現(xiàn)結構,研究了常規(guī)的LMS-OFDM算法,針對該算法無法充分利用多徑信號和抗干擾性弱的缺點,提出了MCMV-OFDM的新算法。仿真結果表明,該算法可以充分利用多徑信號,降低多徑系統(tǒng)的誤碼率。(3)多節(jié)點MIMO系統(tǒng)中以消除同信道干擾(CCI)的波束形成發(fā)送技術。給出了多節(jié)點MIMO系統(tǒng)的數(shù)學模型,學習了常規(guī)的在發(fā)射端消除CCI的波束形成方案,但是該算法對發(fā)送天線數(shù)目有一定要求。針對這一缺點,提出了以最大信漏比為準則的波束形成的新方法,該算法可以消除多節(jié)點間的干擾,且對發(fā)射天線數(shù)沒有要求,仿真結果證實了該算法可以顯著降低系統(tǒng)誤碼率。
[Abstract]:In recent years, CRAHNs network has been widely studied because of its high communication reliability, but it has certain requirements for signal transmission power and can not effectively suppress the multi-path effect. Large-scale MIMO technology can significantly improve the energy efficiency and spectral efficiency of the system. Therefore, combining large-scale MIMO technology with CRAHNs network, the beamforming technology in the system is deeply studied, including beamforming transmission and beamforming reception technology, which mainly solves the problems of multi-path fading and multi-node interference in the system, improves the communication performance of the network and reduces the energy consumption. (1) Broadband beamforming reception technology. The signal receiving model and criterion of narrowband beamforming are extended to broadband, and the processing method and mathematical expression of broadband beamforming are given. Aiming at the disadvantage that conventional beamforming algorithm is applied to antenna array with high sidelobe, a sidelobe constrained optimization beamforming algorithm which can be applied to broadband is proposed, and the beam response diagram is simulated, which verifies that the algorithm can effectively enhance the desired signal and suppress the interference signal. The response value of sidelobe beam can be reduced. (2) combined with OFDM to combat multi-path beamforming reception technology. Combining beamforming technology with OFDM system, the goal is to antagonize or utilize multi-path. This paper introduces two kinds of implementation structures of beamforming applied to OFDM system, studies the conventional LMS-OFDM algorithm, and puts forward a new algorithm of MCMV-OFDM in view of the fact that the algorithm can not make full use of multi-path signal and weak anti-interference. The simulation results show that the algorithm can make full use of the multi-path signal to reduce the bit error rate of the multi-path system. (3) beamforming transmission technology to eliminate co-channel interference (CCI) in the multi-node MIMO system. The mathematical model of multi-node MIMO system is given, and the conventional beamforming scheme to eliminate CCI at the transmitter is learned, but the algorithm has certain requirements for the number of transmit antennas. In order to solve this problem, a new beamforming method based on the maximum signal-leakage ratio is proposed. The algorithm can eliminate the interference between multiple nodes, and there is no requirement for the number of transmit antennas. The simulation results show that the algorithm can significantly reduce the bit error rate (BER) of the system.
【學位授予單位】：南京郵電大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN919.3

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