本文關鍵詞： 協(xié)作通信 多輸入多輸出 空間調制 空移鍵控 發(fā)射分集　出處：《天津大學》2014年博士論文　論文類型：學位論文

【摘要】：近年來，多天線和協(xié)作通信技術的研究引起了學術界和產業(yè)界的極大關注。多天線技術，即多輸入多輸出（MIMO）傳輸技術，能為發(fā)射機和/或接收機端配置多根天線的通信系統(tǒng)提供空間復用增益和/或空間分集增益。在某些環(huán)境中，移動設備受到體積、復雜度以及功耗因素的制約，無法配置多根天線。此時，協(xié)作傳輸技術可以利用一組單天線終端通過彼此共享天線和其他資源的方式提供分集增益。因此，協(xié)作通信系統(tǒng)也可視為廣義的MIMO系統(tǒng)。 空間調制（SM）和空移鍵控（SSK）是面向MIMO無線系統(tǒng)的低復雜度空間復用技術。SM/SSK技術的典型特征是將多天線構成空間域，以此作為傳輸信息的新資源。與單天線系統(tǒng)相比，SM/SSK能夠提供更高的頻譜效率和更強的魯棒性。此外，SM/SSK可以避免傳統(tǒng)MIMO技術中存在的信道間干擾（ICI）和天線同步（IAS）問題，因而具有更低的系統(tǒng)復雜度。 本論文主要研究SM/SSK思想在MIMO和協(xié)作通信系統(tǒng)中的應用，設計了面向MIMO系統(tǒng)的空間星座自適應映射機制，提出了面向多中繼網絡的SSK協(xié)作傳輸策略。具體研究內容歸納如下。 提出了面向廣義空移鍵控（GSSK）系統(tǒng)的自適應空域優(yōu)化技術。GSSK拓展了SSK定義的空間域概念，構成空間星座的不再是各發(fā)射天線，，而是多根被激活天線的組合。與SSK技術相比，GSSK具有更高的頻譜效率。遺憾的是，SSK和GSSK技術都無法獲得發(fā)射分集。并且，在GSSK的空間星座中普遍存在不攜帶任何信息的冗余星座點�；谏鲜鲇^察，本論文提出了一種新穎的自適應映射GSSK（AM-GSSK）技術。該技術根據信道狀態(tài)信息（CSI）對包含冗余的空間星座進行優(yōu)化篩選，并由此降低系統(tǒng)的誤碼率（SER）。為選取最優(yōu)的空間星座點，分別提出了空間域全局優(yōu)化算法和局部優(yōu)化算法。理論分析表明，AM-GSSK系統(tǒng)能夠獲得發(fā)射分集。 提出了面向廣義空間調制系統(tǒng)（GSM）的信號－空間域聯(lián)合優(yōu)化技術。在GSM系統(tǒng)中，信息比特被分別映射到了信號星座和空間星座。為此，本論文提出了聯(lián)合優(yōu)化信號星座和空間星座的自適應聯(lián)合映射GSM（AJM-GSM）技術。分別給出了全局優(yōu)化算法和局部優(yōu)化算法。仿真結果表明，AJM-GSM技術能明顯降低GSM系統(tǒng)的SER。 本論文將SM/SSK的思想拓展應用于協(xié)作通信系統(tǒng)，提出了面向多中繼協(xié)作網絡的協(xié)作空移鍵控（CSSK）傳輸策略。在CSSK系統(tǒng)中，源節(jié)點發(fā)送的信息在中繼轉發(fā)階段映射到了由多個中繼節(jié)點構成的分布式空間域，并通過空間域傳輸至目的節(jié)點。依據中繼節(jié)點工作方式的不同，本論文提出了兩種不同的CSSK傳輸模式：解調轉發(fā)CSSK（DmF-CSSK）模式和解碼轉發(fā)CSSK（DF-CSSK）模式。分別給出了兩種不同模式的最優(yōu)檢測算法。此外，針對DF-CSSK模式提出了一種簡化的折線近似檢測算法。通過理論分析給出了DF-CSSK系統(tǒng)所能獲得的分集階數。最后，進一步通過仿真驗證了CSSK系統(tǒng)的性能。理論分析與仿真結果表明，CSSK作為一種面向多中繼的低復雜度協(xié)作傳輸技術具有獨特的實用優(yōu)勢。
[Abstract]:In recent years, research on multiple antenna and cooperative communication technology has aroused great concern in academia and industry. The multi antenna technology, namely multiple input multiple output (MIMO) transmission technology, communication system for the transmitter and / or receiver with multiple antennas provide spatial multiplexing gain and / or spatial diversity gain in some. In the environment of mobile devices, by volume, complex control system and power factor, unable to configure multiple antennas. The cooperative transmission technology can provide diversity gain by sharing their antennas and other resources in the way of using a set of single antenna terminals. Therefore, cooperative communication system can be regarded as a generalized MIMO system.
Spatial modulation (SM) and space shift keying (SSK) is a typical feature for MIMO wireless system with low complexity of spatial multiplexing.SM/SSK technology is multi antenna composed of spatial domain, as a new resource to transmit information. Compared with the single antenna system, the robustness of SM/SSK can provide higher spectrum efficiency and stronger. In addition, SM/SSK can avoid channel in the traditional MIMO technology interference (ICI) and antenna synchronization (IAS), so the system has lower complexity.
This paper mainly studies the application of SM/SSK in MIMO and cooperative communication system, designs the adaptive mapping mechanism for space Constellation oriented to MIMO system, and proposes a SSK cooperative transmission strategy for multiple relay networks. The specific research contents are summarized below.
Put forward based on the generalized space shift keying (GSSK) system adaptive spatial optimization technology of.GSSK extends the concept of spatial domain defined by SSK, which is no longer a constellation of each transmitting antenna, a plurality of combination but activated antenna. Compared with SSK, GSSK has higher spectrum efficiency. Unfortunately, SSK and GSSK Technology can obtain transmit diversity and redundancy of the constellation points do not carry any information in the common space constellation GSSK. Based on the above observation, this paper proposes a novel adaptive mapping GSSK (AM-GSSK) technology. The technology according to the channel state information (CSI) was adopted to optimize the selection of redundant space constellation, and thus reduce the bit error rate (SER). In order to select the optimal spatial constellation points, respectively put forward space domain global optimization algorithm and local optimization algorithm. Theoretical analysis shows that the AM-GSSK system can achieve Emission diversity.
Put forward based on the generalized spatial modulation system (GSM) combined with optimization technique of signal space domain. In GSM system, the information bits are mapped to the constellation constellation and space. Therefore, this thesis proposes an adaptive joint optimization of signal constellation and constellation mapping combined with GSM (AJM-GSM) technology are presented. The global optimization algorithm and local optimization algorithm. The simulation results show that AJM-GSM technology can significantly reduce the GSM system SER.
This paper extend the concept of SM/SSK applied in cooperative communication system, and proposes a collaborative space oriented multi relay cooperative network shift keying (CSSK) transmission strategy. In the CSSK system, the source node sends the information in the relay mapping stage to distributed spatial domain composed of multiple relay nodes, and through space the domain is transmitted to the destination node. Based on the relay node in the different ways of working, this paper presents two different transmission modes: CSSK CSSK (DmF-CSSK) demodulation forwarding mode and decode and forward CSSK (DF-CSSK) model. The optimal mode of two different detection algorithms are presented. In addition, according to the DF-CSSK detection algorithm is proposed a simplified approximate polygon. The diversity order can be obtained in DF-CSSK system is given through theoretical analysis. Finally, further verify the performance of CSSK system by simulation. Theoretical analysis and simulation results show that C SSK has a unique practical advantage as a low complexity cooperative transmission technology for multiple relays.

【學位授予單位】：天津大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TN820;TN761

【參考文獻】

相關博士學位論文 前1條

1 李軍;協(xié)作通信系統(tǒng)性能和功率分配研究[D];北京郵電大學;2011年

本文編號：1540077