本文選題：信道模型和參數(shù)　切入點：信道測量　出處：《華北電力大學(xué)》2015年博士論文　論文類型：學(xué)位論文

【摘要】：無線系統(tǒng)在室內(nèi)室外的廣泛應(yīng)用使得科學(xué)家和工程師們在不斷發(fā)展新的技術(shù)來提高傳輸速率和信道容量。由于分配給無線系統(tǒng)的可用的頻譜有限,因而多輸入多輸出以及虛擬多輸入多輸出被應(yīng)用到新的無線系統(tǒng)中來提高頻譜效率和系統(tǒng)容量�；谑覂�(nèi)到室外的測量數(shù)據(jù),本文研究了動態(tài)和固定范圍兩種去噪方法。研究發(fā)現(xiàn),當(dāng)從測量的信道響應(yīng)中可以清晰地觀察到信號的噪底和動態(tài)范圍時,利用動態(tài)去噪的方法較合適。固定范圍去噪時對時延功率譜沒有大的影響,使用動態(tài)去噪會使得到延功率譜會有較為明晰的變化。K因子的統(tǒng)計值和去除噪音后的值進行了比較,通過比較可以看出萊斯K因子對去噪的方法是不敏感的,即使不去噪聲對K因子也沒有大的影響。本文在2.25 GHz和5.25 GHz載頻以及100MHz帶寬下,通過實際測量研究了城市微蜂窩中寬帶信道模型和信道特性,比較研究了兩個頻段在信道模型、信道參數(shù)以及參數(shù)相關(guān)性方面的異同。研究結(jié)果表明,在同一路徑兩個頻段絕大多數(shù)信道參數(shù)是獨立的,但它們的相干帶寬卻有很好的相關(guān)性。本文通過對現(xiàn)代化辦公室環(huán)境多用戶MIMO信道的實際測試,研究了虛擬多輸入和多輸出(V-MIMO)的特性,并將這些研究結(jié)果與傳統(tǒng)多輸入多輸出(MIMO)在理論和實驗上進行了比較。結(jié)果表明,V-MIMO技術(shù)在許多場景中可以有效提高信道容量。在無線通信中,信道容量是一個相關(guān)性參數(shù)。信道容量受許多參數(shù)的影響,如信道的K因子、rms時延擴展、空間相關(guān)性等。本文研究了信道參數(shù)如K因子、rms時延擴展和空間相關(guān)性對V-MIMO信道容量的影響,對靜止多用戶系統(tǒng),開展了對多用戶信道的信道容量、K因子、rms時延擴展和空間相關(guān)性的評估。在本文中,通過在基站或接入點使用線性預(yù)編碼方案,研究了V-MIMO無線系統(tǒng)的性能。其基本思想是通過基站采用預(yù)編碼來驗證虛擬MIMO在性能上優(yōu)于單用戶MIMO。用在本文接收機中的線性預(yù)編碼方案有迫零(ZF),最小均方誤差(MMSE)和連續(xù)干擾消除(SIC)方法。最后研究了發(fā)射和接收聯(lián)合波束成形方法。使用線性預(yù)編碼方案,連續(xù)干擾消除(SIC)與最小均方誤差(MMSE)、迫零算法(ZF)相比可以得到更高的信道容量。在分析連續(xù)干擾消除(SIC)線性預(yù)編碼時,相比單用戶MIMO, V-MIMO系統(tǒng)可獲得信道最大傳輸速率。利用發(fā)射和接收聯(lián)合波束成形,本文研究了兩種傳輸模式,一種是最大本征模式(單波束)和本征模式(多波束)傳輸,本文分析了注水法和等功率分配的兩種本征模傳輸方法。與其它本征模傳輸相比,使用注水法可得到更大的信道容量。和傳統(tǒng)MIMO系統(tǒng)比較,V-MIMO系統(tǒng)可獲得信道最大傳輸速率。
[Abstract]:The widespread use of wireless systems indoors and outdoors has led scientists and engineers to develop new technologies to improve transmission rates and channel capacity. Thus, multiple input multiple output and virtual multiple input multiple output are applied to new wireless systems to improve spectrum efficiency and system capacity. In this paper, dynamic and fixed range denoising methods are studied. It is found that when the noise bottom and dynamic range of the signal can be clearly observed from the measured channel response, The method of dynamic denoising is more suitable. When denoising in fixed range, there is no great influence on the delay power spectrum. It can be seen by comparison that Rice K factor is insensitive to denoising methods, and even without noise removal has no great effect on K factor. In this paper, the carrier frequencies of 2.25 GHz and 5.25 GHz and 100MHz bandwidth are obtained. The broadband channel model and channel characteristics in urban microcellular are studied by actual measurement. The similarities and differences between the two frequency bands in channel model, channel parameters and their correlation are compared. The results show that, In the same path, most of the channel parameters in two frequency bands are independent, but their coherent bandwidth has good correlation. In this paper, a practical test of multiuser MIMO channel in modern office environment is carried out. The characteristics of virtual multi-input and multi-output V-MIMOs are studied. The theoretical and experimental results are compared with those of the traditional MIMO. The results show that the V-MIMO technology can effectively improve the channel capacity in many scenarios. The channel capacity is a dependent parameter. The channel capacity is affected by many parameters, such as the K factor of the channel and the delay spread of RMS. The influence of channel parameters such as K factor rms delay spread and spatial correlation on the capacity of V-MIMO channel is studied in this paper. The channel capacity factor RMS delay spread and spatial correlation of multiuser channels are evaluated. In this paper, linear precoding schemes are used at base stations or access points. In this paper, the performance of V-MIMO wireless system is studied. The basic idea is to use precoding to verify the performance of virtual MIMO is superior to that of single-user MIMO.The linear precoding scheme used in the receiver in this paper is Zero-forcing and minimum mean Square error (MMSE). And continuous interference cancellation (CCI) method. Finally, the combined beamforming method of transmitting and receiving is studied. Linear precoding scheme is used. Compared with the minimum mean square error (MMSE) and zero forcing algorithm (ZFF), the channel capacity of continuous interference cancellation (CICI) is higher than that of MMSE (minimum mean Square error). Compared with single user MIMO-MIMO system, the channel maximum transmission rate can be obtained in V-MIMO system. Using transmit and receive joint beamforming, this paper studies two transmission modes, one is maximum intrinsic mode (single beam) and the other is intrinsic mode (multi-beam) transmission. In this paper, two intrinsic mode transmission methods of water injection and equal power distribution are analyzed. Compared with other intrinsic mode transmission, the channel capacity can be obtained by using the water injection method. Compared with the traditional MIMO system, the V-MIMO system can obtain the maximum channel transmission rate.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TN919.3

【參考文獻】

相關(guān)期刊論文 前1條

1 ;Two-dimensional water-filling power allocation algorithm for MIMO-OFDM systems[J];Science China(Information Sciences);2010年06期

，

本文編號：1591672