多用戶空間相關(guān)MIMO信道容量研究
發(fā)布時間：2018-07-15 19:18
【摘要】：多輸入多輸出(MIMO)技術(shù)能夠在不增加系統(tǒng)帶寬和發(fā)射功率的情況下,大幅度地提升系統(tǒng)容量,改善無線通信系統(tǒng)的性能,因此成為目前研究的熱點(diǎn)。本文在已有的研究基礎(chǔ)上,開展空域相關(guān)MIMO系統(tǒng)容量和自由空間MIMO系統(tǒng)關(guān)鍵技術(shù)研究,選題具有理論意義和應(yīng)用價值。論文的主要研究工作如下:1.在平坦衰落信道下,結(jié)合MIMO系統(tǒng)天線之間的相關(guān)特性,研究了Kronecker相關(guān)信道模型。針對瑞利衰落信道下的均勻線陣,給出了不同角度功率譜分布下的相關(guān)系數(shù)解析式,分析了角度擴(kuò)展和天線間距對相關(guān)性的影響。2.給出了相關(guān)信道下單用戶MIMO遍歷容量的近似表達(dá)式,并仿真分析了角度擴(kuò)展、天線間距和平均波達(dá)角對信道容量的影響。研究了相關(guān)信道下注水功率分配對信道容量的影響,仿真結(jié)果表明,信噪比較低時相關(guān)性對系統(tǒng)容量具有提升作用。3.基于大規(guī)模隨機(jī)矩陣?yán)碚?使用確定性近似的方法研究分析了上行多用戶MIMO容量。在發(fā)射端已知統(tǒng)計的信道狀態(tài)信息的情況下,研究了廣義注水功率分配的具體算法。仿真結(jié)果表明,確定性近似計算方法具有很高的準(zhǔn)確性。4.在航空信道環(huán)境下,仿真對比了自由空間視距MIMO容量和瑞利衰落MIMO容量。提出了基于單載波頻域均衡(SC-FDE)和正交頻分復(fù)用技術(shù)的自由空間寬帶MIMO系統(tǒng),并對系統(tǒng)容量進(jìn)行了仿真。針對SC-FDE系統(tǒng),考慮了天線間時延對信道容量的影響,仿真結(jié)果表明,采用空時聯(lián)合處理方法,碼間干擾可以提升系統(tǒng)容量。
[Abstract]:Multiple input multiple output (MIMO) technology can greatly enhance the system capacity and improve the performance of wireless communication systems without increasing the system bandwidth and transmission power, so it has become a hot research topic at present. Based on the existing research, this paper studies the key technologies of spatially correlated MIMO systems and free-space MIMO systems. The topic is of theoretical significance and practical value. The main research work of this paper is as follows: 1. In flat fading channel, the Kronecker correlation channel model is studied based on the correlation between antennas of MIMO system. For the uniform linear array in Rayleigh fading channel, the analytical formula of correlation coefficient under different angular power spectrum distribution is given, and the influence of angle spread and antenna spacing on correlation is analyzed. The approximate expression of MIMO ergodic capacity of correlated channel ordering users is given and the effects of angle spread antenna spacing and average angle of arrival on channel capacity are simulated and analyzed. The influence of water injection power allocation on the channel capacity in correlated channel is studied. The simulation results show that the correlation can enhance the capacity of the system when the SNR is low. Based on the large-scale stochastic matrix theory, the uplink multi-user MIMO capacity is analyzed using deterministic approximation method. Under the condition that the channel state information of the transmitter is known, the algorithm of generalized water injection power allocation is studied. The simulation results show that the deterministic approximation method has a high accuracy. In the aeronautical channel environment, the free space line-of-sight MIMO capacity and Rayleigh fading MIMO capacity are compared. A free space broadband MIMO system based on single carrier frequency domain equalization (SC-FDE) and orthogonal frequency division multiplexing (OFDM) is proposed, and the system capacity is simulated. For SC-FDE system, the influence of time delay between antennas on the channel capacity is considered. The simulation results show that using space-time joint processing method, inter-symbol interference can enhance the capacity of the system.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN919.3
，
本文編號：2125117
[Abstract]:Multiple input multiple output (MIMO) technology can greatly enhance the system capacity and improve the performance of wireless communication systems without increasing the system bandwidth and transmission power, so it has become a hot research topic at present. Based on the existing research, this paper studies the key technologies of spatially correlated MIMO systems and free-space MIMO systems. The topic is of theoretical significance and practical value. The main research work of this paper is as follows: 1. In flat fading channel, the Kronecker correlation channel model is studied based on the correlation between antennas of MIMO system. For the uniform linear array in Rayleigh fading channel, the analytical formula of correlation coefficient under different angular power spectrum distribution is given, and the influence of angle spread and antenna spacing on correlation is analyzed. The approximate expression of MIMO ergodic capacity of correlated channel ordering users is given and the effects of angle spread antenna spacing and average angle of arrival on channel capacity are simulated and analyzed. The influence of water injection power allocation on the channel capacity in correlated channel is studied. The simulation results show that the correlation can enhance the capacity of the system when the SNR is low. Based on the large-scale stochastic matrix theory, the uplink multi-user MIMO capacity is analyzed using deterministic approximation method. Under the condition that the channel state information of the transmitter is known, the algorithm of generalized water injection power allocation is studied. The simulation results show that the deterministic approximation method has a high accuracy. In the aeronautical channel environment, the free space line-of-sight MIMO capacity and Rayleigh fading MIMO capacity are compared. A free space broadband MIMO system based on single carrier frequency domain equalization (SC-FDE) and orthogonal frequency division multiplexing (OFDM) is proposed, and the system capacity is simulated. For SC-FDE system, the influence of time delay between antennas on the channel capacity is considered. The simulation results show that using space-time joint processing method, inter-symbol interference can enhance the capacity of the system.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN919.3
，
本文編號：2125117
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