本文選題：大規(guī)模MIMO + 頻譜效率��； 參考：《大連海事大學(xué)》2017年碩士論文

【摘要】：作為5G中的關(guān)鍵技術(shù),大規(guī)模MIMO技術(shù)通過在基站側(cè)配置幾十根甚至上百根天線,能夠深度挖掘空間的無線資源提高無線通信系統(tǒng)的性能,但是這些性能的提升是以增加硬件成本和能耗為代價的。能量效率作為無線通信中一個重要的衡量指標,被定義為系統(tǒng)和速率與功率之比,能夠很好的體現(xiàn)系統(tǒng)速率與功率之間的折中。以此為背景,本論文圍繞多用戶大規(guī)模MIMO系統(tǒng)的頻譜效率和能量效率進行研究和分析。首先對多用戶大規(guī)模MIMO系統(tǒng)下行鏈路的頻譜效率和能量效率進行研究。分析了下行系統(tǒng)頻譜效率的近似解表達式,其次依據(jù)能效定義建立能效模型,討論了基站天線數(shù),小區(qū)用戶數(shù)和發(fā)送功率分別對系統(tǒng)頻譜效率和能量效率的影響。仿真結(jié)果表明單小區(qū)系統(tǒng)的頻譜效率隨天線數(shù)的增加不斷增加,多小區(qū)系統(tǒng)的頻譜效率隨天線數(shù)的增加先增加后趨于一定值;多小區(qū)由于存在導(dǎo)頻污染和小區(qū)間干擾,其性能相對單小區(qū)較差;系統(tǒng)的能量效率均為天線數(shù)、小區(qū)用戶數(shù)和發(fā)送功率的凸函數(shù);增加發(fā)送功率只能暫時提高系統(tǒng)頻譜效率和能量效率,當發(fā)送功率超過某一值時,系統(tǒng)頻譜效率趨于恒值,能量效率逐漸減小。之后,考慮上行和下行多用戶MIMO聯(lián)合系統(tǒng)和一種更為貼近實際的功耗模型,對系統(tǒng)的能效最大化進行研究。該功耗模型不僅包含了發(fā)送和接收端與天線相關(guān)的線性消耗功率,還包括了信號檢測和預(yù)編碼、編碼和解碼、回程和信道估計的消耗功率。理論分析了采用ZF處理時,如何聯(lián)合選取天線數(shù)、用戶數(shù)以及發(fā)送信噪比能夠使得系統(tǒng)能量效率達到最大。給出了能量效率與可達速率之間的閉式表達式。仿真結(jié)果表明ZF能效和可達速率要比MRT/MRC高的多,最大能效約為MRT/MRC的3倍,相應(yīng)的可達速率約為MRT/MRC的8倍;系統(tǒng)總發(fā)送功率應(yīng)該隨基站天線數(shù)的增加而增加以補償電路功耗增加帶來的損失;能量效率和可達速率的趨勢并不總能保持一致,而是隨可達速率的增加先增加后減小,這是因為當可達速率較低的時候電路功率占據(jù)主導(dǎo)地位,而當可達速率較高時發(fā)送功率占據(jù)主導(dǎo)地位。
[Abstract]:As a key technology in 5G, large-scale MIMO technology can improve the performance of wireless communication system by configuring dozens or even hundreds of antennas on the base station side. But these performance improvements come at the expense of increased hardware costs and energy consumption. As an important measure of wireless communication, energy efficiency is defined as the ratio of system and rate to power, which can well reflect the compromise between system speed and power. Against this background, this thesis focuses on the spectrum efficiency and energy efficiency of multiuser large scale MIMO systems. First, the spectrum efficiency and energy efficiency of multiuser large scale MIMO system downlink are studied. The approximate expression of spectrum efficiency of downlink system is analyzed, and then the energy efficiency model is established according to the definition of energy efficiency. The effects of the number of base station antennas, the number of cell users and the transmission power on the spectrum efficiency and energy efficiency of the system are discussed. The simulation results show that the spectral efficiency of single-cell system increases with the increase of the number of antennas, the spectral efficiency of multi-cell system increases first and then tends to a certain value with the increase of the number of antennas, and the multi-cell system has pilot pollution and inter-cell interference. The energy efficiency of the system is the convex function of the number of antennas, the number of cell users and the transmission power, and the increase of transmission power can only temporarily improve the spectral efficiency and energy efficiency of the system, when the transmission power exceeds a certain value, The spectral efficiency of the system tends to constant and the energy efficiency decreases gradually. Then, considering the uplink and downlink multiuser MIMO system and a more practical power model, the maximum energy efficiency of the system is studied. The power consumption model includes not only the linear power consumption associated with the antenna at the transmitter and receiver, but also the power consumption of signal detection and precoding, coding and decoding, return range and channel estimation. How to select the number of antennas, the number of users and the signal-to-noise ratio can make the energy efficiency of the system maximum when ZF processing is adopted. A closed expression between energy efficiency and reachability rate is given. The simulation results show that the energy efficiency and reachable rate of ZF are much higher than that of MRT/MRC, the maximum energy efficiency is about 3 times of MRT/MRC, and the corresponding reachability rate is about 8 times that of MRT/MRC. The total transmission power of the system should increase with the increase in the number of base station antennas to compensate for the loss caused by the increased power consumption of the circuit; the trend of energy efficiency and reachable rate is not always consistent, but increases first and then decreases with the increase of reachable rate. This is because the circuit power dominates when the reachable rate is low and the transmission power dominates when the reachability rate is high.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN919.3

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本文編號：1927343