預編碼空間調制方案的研究與仿真
發(fā)布時間：2019-04-26 04:39
【摘要】：多輸入多輸出技術(MIMO,Multiple Input Multiple Output)在發(fā)射端和接收端配置了多根天線,提升了信道容量和系統(tǒng)吞吐率,因而成為現(xiàn)代無線通信的關鍵技術之一。然而多天線的配置給系統(tǒng)帶來巨大優(yōu)勢的同時也帶來較多問題,其中之一就是多天線同時傳輸信號帶來較大的天線間干擾(IAI,InterAntenna Interference),進一步導致接收端檢測復雜度增大。針對該問題,空間調制技術(GSM,Generalised Spatial Modulation)減少發(fā)射端天線同時傳輸信號的數(shù)量,增加了空間域傳輸信息的方式,有效減少甚至消除了IAI,大大減少了發(fā)送端和接收端的復雜度,成為研究熱點之一。預編碼空間調制技術(GPSM,Generalised Pre-coding Spatial Modulation)則需要發(fā)射端獲取信道狀態(tài)信息進行預編碼,減少接收端同時接收有用信號的數(shù)量達到在空間域傳輸信息的目的,這樣便將計算任務從接收端轉移到了發(fā)射端,大大減少了接收端的復雜度,因此GPSM方案適用于蜂窩網中基站到移動用戶的下行鏈路通信場景。本文首先介紹了論文的研究背景,GSM、GPSM技術的國內外研究現(xiàn)狀。詳細說明了MIMO技術中的一種典型系統(tǒng),垂直分層空時碼系統(tǒng)的系統(tǒng)模型,工作原理以及系統(tǒng)特點。最后對空間調制系統(tǒng)的系統(tǒng)模型和系統(tǒng)特點進行詳細闡述。論文主要研究了單用戶模式下GPSM方案的系統(tǒng)性能,首先介紹了該方案的系統(tǒng)模型,主要包括傳輸符號的調制方法,主要的檢測方案和工作原理。然后介紹了常用的兩種預編碼器,ZF和MMSE預編碼器,推導采用該預編碼器的平均誤比特率的解析解上界,與鏈路級仿真結果進行比較以相互驗證正確性。對GPSM方案進行BER性能仿真,速率匹配分析和魯棒性分析,并與傳統(tǒng)的MIMO方案在BER性能,傳輸速率和魯棒性和接收端計算復雜度等方面進行比較,得出GPSM方案更優(yōu)的結論。其次將GPSM方案應用到多用戶情景下進行性能分析。采用了線性和非線性預編碼技術。線性預編碼包括三種多用戶預編碼方案,將其經過調整或改進后與GPSM方案結合,對比分析了三種方案的優(yōu)缺點。非線性預編碼技術則采用了THP(Tomlinson-Harashima Precoding)預編碼,為了與預編碼空間調制方案結合,將多用戶單流系統(tǒng)推廣到多用戶多流系統(tǒng),對結合方案的BER性能進行仿真分析。最后針對該方案的用戶性能差異較大的問題,研究了”best-first”排序方法以最小化每個用戶的等效噪聲方差,仿真結果顯示系統(tǒng)整體性能得到提高,并討論分析了”best-first”排序法能有效提高系統(tǒng)平均性能的條件。
[Abstract]:Multi-input multiple-output (MIMO,Multiple Input Multiple Output) technology is one of the key technologies in modern wireless communication due to the deployment of multiple antennas at the transmitter and receiver, which improves the channel capacity and system throughput. However, the configuration of multi-antenna brings great advantages to the system as well as many problems, one of which is that multi-antenna simultaneous transmission signal brings about large inter-antenna interference (IAI,InterAntenna Interference),) further increases the detection complexity of the receiver. In order to solve this problem, the spatial modulation technology (GSM,Generalised Spatial Modulation) reduces the number of transmit signals at the same time, increases the way of transmitting information in the space domain, and effectively reduces or even eliminates the IAI,. It greatly reduces the complexity of the sender and receiver, and becomes one of the research hotspots. Pre-coded spatial modulation (GPSM,Generalised Pre-coding Spatial Modulation) requires the transmitter to obtain channel state information for pre-coding, to reduce the number of useful signals received by the receiver at the same time to achieve the purpose of transmitting information in the spatial domain. In this way, the computing task is transferred from the receiver to the transmitter, and the complexity of the receiver is greatly reduced. Therefore, the GPSM scheme is suitable for downlink communication scenarios from base stations to mobile users in cellular networks. Firstly, this paper introduces the research background of this paper, and the research status of GSM,GPSM technology at home and abroad. In this paper, a typical system in MIMO technology, the system model, working principle and system characteristics of vertical layered space-time code system are described in detail. Finally, the system model and system characteristics of spatial modulation system are described in detail. In this paper, the system performance of the GPSM scheme in single user mode is studied. Firstly, the system model of the scheme is introduced, including the modulation method of the transmission symbol, the main detection scheme and the working principle. Then two common precodecs, ZF and MMSE precodecs, are introduced. The upper bound of the analytic solution of the average bit error rate of the precodecs is deduced and compared with the link level simulation results to verify the correctness of the precodecs. The BER performance simulation, rate matching analysis and robustness analysis of the GPSM scheme are carried out. Compared with the traditional MIMO scheme in the aspects of BER performance, transmission rate and robustness, and the computational complexity of the receiver, the conclusion is drawn that the GPSM scheme is better than the traditional MIMO scheme in terms of performance, transmission rate, robustness and computational complexity of the receiver. Secondly, the GPSM scheme is applied to the multi-user scenario for performance analysis. Linear and nonlinear precoding techniques are used. The linear precoding includes three multi-user precoding schemes, which are adjusted or improved and combined with the GPSM scheme. The advantages and disadvantages of the three schemes are compared and analyzed. The nonlinear precoding technology adopts THP (Tomlinson-Harashima Precoding) precoding. In order to combine with the pre-coded spatial modulation scheme, the multi-user single-stream system is extended to the multi-user multi-stream system, and the BER performance of the combination scheme is simulated and analyzed. Finally, in order to minimize the equivalent noise variance of each user, the "best-first" ranking method is studied to solve the problem that the user performance of the scheme varies greatly. The simulation results show that the overall performance of the system is improved. The conditions under which the "best-first" sequencing method can effectively improve the average performance of the system are also discussed.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN919.3
本文編號：2465760
[Abstract]:Multi-input multiple-output (MIMO,Multiple Input Multiple Output) technology is one of the key technologies in modern wireless communication due to the deployment of multiple antennas at the transmitter and receiver, which improves the channel capacity and system throughput. However, the configuration of multi-antenna brings great advantages to the system as well as many problems, one of which is that multi-antenna simultaneous transmission signal brings about large inter-antenna interference (IAI,InterAntenna Interference),) further increases the detection complexity of the receiver. In order to solve this problem, the spatial modulation technology (GSM,Generalised Spatial Modulation) reduces the number of transmit signals at the same time, increases the way of transmitting information in the space domain, and effectively reduces or even eliminates the IAI,. It greatly reduces the complexity of the sender and receiver, and becomes one of the research hotspots. Pre-coded spatial modulation (GPSM,Generalised Pre-coding Spatial Modulation) requires the transmitter to obtain channel state information for pre-coding, to reduce the number of useful signals received by the receiver at the same time to achieve the purpose of transmitting information in the spatial domain. In this way, the computing task is transferred from the receiver to the transmitter, and the complexity of the receiver is greatly reduced. Therefore, the GPSM scheme is suitable for downlink communication scenarios from base stations to mobile users in cellular networks. Firstly, this paper introduces the research background of this paper, and the research status of GSM,GPSM technology at home and abroad. In this paper, a typical system in MIMO technology, the system model, working principle and system characteristics of vertical layered space-time code system are described in detail. Finally, the system model and system characteristics of spatial modulation system are described in detail. In this paper, the system performance of the GPSM scheme in single user mode is studied. Firstly, the system model of the scheme is introduced, including the modulation method of the transmission symbol, the main detection scheme and the working principle. Then two common precodecs, ZF and MMSE precodecs, are introduced. The upper bound of the analytic solution of the average bit error rate of the precodecs is deduced and compared with the link level simulation results to verify the correctness of the precodecs. The BER performance simulation, rate matching analysis and robustness analysis of the GPSM scheme are carried out. Compared with the traditional MIMO scheme in the aspects of BER performance, transmission rate and robustness, and the computational complexity of the receiver, the conclusion is drawn that the GPSM scheme is better than the traditional MIMO scheme in terms of performance, transmission rate, robustness and computational complexity of the receiver. Secondly, the GPSM scheme is applied to the multi-user scenario for performance analysis. Linear and nonlinear precoding techniques are used. The linear precoding includes three multi-user precoding schemes, which are adjusted or improved and combined with the GPSM scheme. The advantages and disadvantages of the three schemes are compared and analyzed. The nonlinear precoding technology adopts THP (Tomlinson-Harashima Precoding) precoding. In order to combine with the pre-coded spatial modulation scheme, the multi-user single-stream system is extended to the multi-user multi-stream system, and the BER performance of the combination scheme is simulated and analyzed. Finally, in order to minimize the equivalent noise variance of each user, the "best-first" ranking method is studied to solve the problem that the user performance of the scheme varies greatly. The simulation results show that the overall performance of the system is improved. The conditions under which the "best-first" sequencing method can effectively improve the average performance of the system are also discussed.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN919.3
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