本文選題：OFDM協(xié)作中繼網(wǎng)絡(luò) + 射頻資源分配��； 參考：《武漢理工大學(xué)》2014年博士論文

【摘要】：正交頻分復(fù)用（Orthogonal Frequency Division Multiplexing，OFDM）無線協(xié)作中繼網(wǎng)絡(luò)因其在提升網(wǎng)絡(luò)容量域、增強(qiáng)端到端鏈路傳輸可靠性、擴(kuò)大無線覆蓋范圍等方面的巨大優(yōu)勢以及在設(shè)計和部署上的靈活性，已受到學(xué)術(shù)界和產(chǎn)業(yè)界的廣泛關(guān)注。在這種網(wǎng)絡(luò)中，協(xié)作策略和射頻資源分配是保證或提升其性能的兩大關(guān)鍵研究點(diǎn)。另一方面，隨著類型多樣的高速高帶寬新興無線應(yīng)用呈井噴式增長，無線頻譜資源供給與用戶服務(wù)需求之間的矛盾愈發(fā)加劇。再者，無線通信的能量消耗也逐漸變得不可忽略，構(gòu)建綠色網(wǎng)絡(luò)的需求也變得日益緊迫。因此，，如何提升無線網(wǎng)絡(luò)的頻譜效率、能量效率以及對各類應(yīng)用服務(wù)的良好支持能力，將成為增強(qiáng)無線通信網(wǎng)絡(luò)性能并緩解持續(xù)增長的無線應(yīng)用需求壓力的關(guān)鍵問題之一。鑒于此，本論文重點(diǎn)從頻譜效率、能量效率和業(yè)務(wù)服務(wù)質(zhì)量增強(qiáng)三個角度對OFDM無線協(xié)作中繼網(wǎng)絡(luò)射頻資源優(yōu)化相關(guān)理論與關(guān)鍵技術(shù)展開研究，以期獲取高能譜效率和業(yè)務(wù)支持增強(qiáng)的射頻資源優(yōu)化分配方案，并為未來研究和部署以資源優(yōu)化為核心的應(yīng)用系統(tǒng)提供前期理論參考，從而為解決以上關(guān)鍵問題做出有益貢獻(xiàn)。本文開展的主要研究工作如下： （1）綜述分析并總結(jié)了無線協(xié)作中繼網(wǎng)絡(luò)相關(guān)研究工作。針對協(xié)作中繼策略和射頻資源優(yōu)化分配兩大關(guān)鍵研究點(diǎn)，以O(shè)FDM無線協(xié)作中繼網(wǎng)絡(luò)為重點(diǎn)，從協(xié)作策略、有專用中繼節(jié)點(diǎn)輔助的單向協(xié)作中繼網(wǎng)絡(luò)資源分配、有專用中繼節(jié)點(diǎn)輔助的雙向協(xié)作中繼網(wǎng)絡(luò)資源分配、基于用戶協(xié)作的中繼網(wǎng)絡(luò)資源分配以及系統(tǒng)設(shè)計幾大方面，分類綜述分析了與無線協(xié)作中繼網(wǎng)絡(luò)相關(guān)的國內(nèi)外研究成果，并從網(wǎng)絡(luò)場景因素和總體設(shè)計因素角度，分別比較與分析了已有典型方案的特點(diǎn)。在此基礎(chǔ)上，對當(dāng)前研究所存在的問題給出了幾點(diǎn)總結(jié)和建議，并指出了網(wǎng)絡(luò)編碼、非完美信道狀態(tài)信息（Channel State Information，CSI）和多目標(biāo)優(yōu)化設(shè)計在獲取實(shí)用化高能譜效率射頻資源優(yōu)化方案上的重要性。 （2）研究了單向多用戶多中繼OFDM網(wǎng)絡(luò)異質(zhì)業(yè)務(wù)增強(qiáng)及頻譜效率優(yōu)化問題。以單向多用戶多中繼OFDM系統(tǒng)為目標(biāo)網(wǎng)絡(luò)對象，綜合考慮了實(shí)時業(yè)務(wù)流的最小速率需求、基于子載波配對的子載波分配、子載波級功率分配、子載波級中繼-用戶對選擇等因素，以最大化非實(shí)時業(yè)務(wù)總傳輸速率為優(yōu)化目標(biāo)，研究了融入子載波配對技術(shù)的自適應(yīng)射頻資源分配方案，以期增強(qiáng)異質(zhì)業(yè)務(wù)服務(wù)支持并優(yōu)化頻譜效率。針對總網(wǎng)絡(luò)功率約束和獨(dú)立節(jié)點(diǎn)功率約束兩種網(wǎng)絡(luò)配置場景，分別開發(fā)了相應(yīng)的漸近最優(yōu)資源分配算法，以期為不同的場景提供參考方案。仿真評估結(jié)果驗(yàn)證了所提算法在保證實(shí)時業(yè)務(wù)速率需求和系統(tǒng)頻譜效率上的有效性，以及在依據(jù)流量需求和信道狀態(tài)變化自適應(yīng)調(diào)整射頻資源分配方面的靈活性。 （3）研究了融合動態(tài)網(wǎng)絡(luò)編碼的雙向多中繼OFDM網(wǎng)絡(luò)頻譜效率優(yōu)化問題。針對基本的雙向多中繼OFDM系統(tǒng)，分析了網(wǎng)絡(luò)編碼在提升頻譜效率和能量效率方面的優(yōu)勢，并對比分析了靜態(tài)網(wǎng)絡(luò)編碼與動態(tài)網(wǎng)絡(luò)編碼的性能。以融合動態(tài)網(wǎng)絡(luò)編碼的雙向多中繼OFDM系統(tǒng)為目標(biāo)網(wǎng)絡(luò)，考慮含有概率性估計差錯項的非完美CSI，闡述了一個最壞情形優(yōu)化問題，并設(shè)計了一種具備對抗非完美CSI的魯棒性射頻資源優(yōu)化策略。通過與擁有完美CSI假設(shè)的方案和運(yùn)用靜態(tài)網(wǎng)絡(luò)編碼的方案對比，仿真評估結(jié)果驗(yàn)證了所提算法在對抗非完美CSI方面的有效性，并揭示了動態(tài)網(wǎng)絡(luò)編碼在提升頻譜效率上的優(yōu)勢。 （4）研究了融合動態(tài)網(wǎng)絡(luò)編碼的雙向多中繼OFDM網(wǎng)絡(luò)能量效率和業(yè)務(wù)體驗(yàn)質(zhì)量（Quality of Experience，QoE）折衷優(yōu)化。以融合動態(tài)網(wǎng)絡(luò)編碼的雙向多中繼OFDM系統(tǒng)為目標(biāo)網(wǎng)絡(luò)，面向能量效率和用戶業(yè)務(wù)感知質(zhì)量的多目標(biāo)優(yōu)化，研究了QoE與能量消耗的折衷優(yōu)化問題。為獲取QoE與能量的最佳折衷，提出了新的判據(jù)QEE（QoE-Energy），表征單位能量所產(chǎn)生的總QoE增益，并證明了QEE是QoE的準(zhǔn)凹函數(shù)。QEE的準(zhǔn)凹特性使得所闡述的以QEE為優(yōu)化目標(biāo)的射頻資源分配問題成為準(zhǔn)凹優(yōu)化問題，且存在全局唯一最優(yōu)化解。通過將所闡述的優(yōu)化問題轉(zhuǎn)化為一系列凸性可行性問題，提出了一種高效的低復(fù)雜度優(yōu)化框架。在此優(yōu)化框架下，分別針對解碼-轉(zhuǎn)發(fā)（Decode-and-Forward，DF）和計算-轉(zhuǎn)發(fā)（Compute-and-Forward，CPF）兩中繼策略，開發(fā)了相應(yīng)的漸近最優(yōu)算法。仿真評估結(jié)果證實(shí)了所提算法在獲取最優(yōu)折衷點(diǎn)上的有效性。進(jìn)一步地，在此研究基礎(chǔ)上，通過對QoE和能量項引入加權(quán)因子，設(shè)計了一種QoE與能量折衷可控的射頻資源優(yōu)化策略，可實(shí)現(xiàn)由網(wǎng)絡(luò)管理者可控可調(diào)的QoE-能量折衷。 （5）研究了OFDM無線協(xié)作中繼網(wǎng)絡(luò)射頻資源優(yōu)化系統(tǒng)初步設(shè)計方案�；贕NU Radio/USRP開源認(rèn)知軟件無線電平臺，研究了融合網(wǎng)絡(luò)編碼的OFDM協(xié)作中繼網(wǎng)絡(luò)資源優(yōu)化系統(tǒng)試驗(yàn)床的初步設(shè)計方案，以期為未來實(shí)施系統(tǒng)部署工作提供指導(dǎo)和參考。具體地，給出了試驗(yàn)床的具體功能需求、硬件配置參數(shù)，并提出了一種模塊化的節(jié)點(diǎn)軟件架構(gòu)和節(jié)點(diǎn)間交互流程。對具備頻譜認(rèn)知功能的OFDM物理層主要功能進(jìn)了分析并提供了參考思路，包括：頻譜幀聽、多帶濾波、單天線多包發(fā)送與多包接收和OFDM參數(shù)配置接口。提出了一種同步媒質(zhì)接入控制（Medium Access Control，MAC）協(xié)議，給出了其幀結(jié)構(gòu)、操作狀態(tài)和協(xié)議流程設(shè)計參考方案，以期為未來部署和評估射頻資源分配策略及網(wǎng)絡(luò)編碼等功能模塊提供實(shí)施承載體。
[Abstract]:Orthogonal Frequency Division Multiplexing (OFDM) wireless cooperative relay network has received extensive attention in academic and industrial circles because of its great advantages in enhancing the network capacity domain, enhancing the reliability of end-to-end link transmission, expanding wireless coverage, and its flexibility in design and deployment. In the network, the collaboration strategy and radio frequency resource allocation are two key research points to guarantee or improve their performance. On the other hand, with the variety of high speed and high bandwidth emerging wireless applications in blowout, the contradiction between the supply of wireless spectrum resource and the demand of user service is becoming more and more serious. The demand for building a green network is becoming increasingly urgent. Therefore, how to improve the spectrum efficiency, energy efficiency and the ability to support all kinds of application services will become one of the key issues for enhancing the performance of wireless communication networks and alleviating the continued growth of the demand for line free applications. This paper focuses on the theory and key technology of radio frequency resource optimization in OFDM wireless cooperative relay network from three aspects: spectrum efficiency, energy efficiency and service quality enhancement, in order to obtain high energy spectral efficiency and business support enhanced radio frequency resource optimization, and to optimize the resources for future research and deployment. The core application system provides a theoretical reference for the early stage, thus making a useful contribution to solve the above key problems.
(1) the research work of wireless cooperative relay network is summarized and summarized. Aiming at the two key research points of cooperative relay strategy and optimal allocation of radio frequency resources, the OFDM wireless cooperative relay network is focused on, from the cooperative strategy, the network resource allocation is followed by the special relay node assisted unidirectional cooperation, and the special relay node is assisted. The resource allocation of two-way cooperative relay network, the resource allocation of the relay network and the system design based on the user collaboration, the research results about the wireless cooperative relay network are summarized and analyzed, and the characteristics of the existing typical schemes are compared and analyzed from the perspective of the network scene factors and the overall design factors. On this basis, some summaries and suggestions are given for the problems existing in the current research institute, and the importance of network coding, imperfect channel state information (Channel State Information, CSI) and multi-objective optimization design are pointed out in the acquisition of practical high energy spectral efficiency radio frequency resource optimization scheme.
(2) the problem of heterogeneous service enhancement and spectral efficiency optimization of unidirectional multiuser and multi relay OFDM networks is studied. One way multiuser multi relay OFDM system is used as the target network object, and the minimum rate requirement of real-time traffic is considered. Subcarrier allocation based on subcarrier pair, subcarrier level power allocation, subcarrier level relay - user selection In order to maximize the total transmission rate of non real time service as the optimization target, the adaptive radio frequency resource allocation scheme incorporating subcarrier pairing technology is studied to enhance the support of heterogeneous service service and optimize the spectrum efficiency. The phase of the two network configuration scenarios is developed for the total network power constraint and the independent node power rate constraint. An asymptotically optimal resource allocation algorithm is proposed to provide a reference scheme for different scenarios. The simulation results verify the effectiveness of the proposed algorithm in ensuring real-time service rate requirements and system spectrum efficiency, as well as flexibility in adaptive tuning of radio frequency resource allocation in accordance with flow requirements and channel state changes.
(3) the optimization of frequency spectrum efficiency of bidirectional multiple relay OFDM networks with dynamic network coding is studied. Based on the basic bidirectional multiple relay OFDM system, the advantages of network coding in enhancing spectrum efficiency and energy efficiency are analyzed, and the performance of static network coding and dynamic network coding is compared and analyzed in order to fuse dynamic network coding. The bidirectional multi relay OFDM system is the target network. Considering the imperfect CSI containing the probability estimation error term, this paper expounds a worst case optimization problem, and designs a robust radio frequency resource optimization strategy with anti imperfect CSI. It is compared with the scheme with the perfect CSI hypothesis and the scheme using the static network coding. The simulation results verify the effectiveness of the proposed algorithm in resisting imperfect CSI, and reveal the advantage of dynamic network coding in improving spectrum efficiency.
(4) the tradeoff optimization of energy efficiency and business experience quality (Quality of Experience, QoE) of the bidirectional multi relay OFDM network, which is fused with dynamic network coding, is studied. The multi-objective optimization of the bidirectional multi relay OFDM system which combines the dynamic network coding and the energy efficiency and the user's service perception quality is studied. The energy consumption and the energy consumption are studied. In order to obtain the best tradeoff between QoE and energy, a new criterion QEE (QoE-Energy) is proposed to characterize the total QoE gain generated by the unit energy, and it is proved that the quasi concave property of the QEE is a quasi concave function of the QoE, which makes the radio frequency resource allocation problem with the QEE as the optimization goal as a quasi concave optimization problem, and there is a whole problem. By converting the optimization problem to a series of convex feasibility problems, an efficient low complexity optimization framework is proposed. Under this optimization framework, the corresponding asymptotic best is developed for the two relay strategy of decoding forward (Decode-and-Forward, DF) and computing forwarding (Compute-and-Forward, CPF). The simulation evaluation results confirm the effectiveness of the proposed algorithm on obtaining the optimal tradeoff point. Further, on the basis of this study, a QoE and energy tradeoff controlled radio frequency resource optimization strategy is designed by introducing weighting factors to QoE and energy terms, which can achieve controllable and adjustable QoE- energy tradeoff from network managers.
(5) the preliminary design of the radio frequency resource optimization system of OFDM wireless cooperative relay network is studied. Based on the GNU Radio/USRP open source cognitive software radio platform, the preliminary design scheme of the OFDM cooperative relay network resource optimization system test bed is studied, in order to provide guidance and reference for the implementation of the system deployment in the future. Specifically, the specific functional requirements and hardware configuration parameters of the test bed are given, and a modular node software architecture and the interaction flow between nodes are proposed. The main functions of the OFDM physical layer with spectrum cognitive function are analyzed and some reference ideas are provided, including frequency spectrum frame listening, multi band filtering, single antenna multi packet transmission and multiple packets. The receiver and OFDM parameter configuration interface. A Medium Access Control (MAC) protocol is proposed. The frame structure, operation state and protocol flow design reference scheme are given in order to provide the implementation carrier for the future deployment and evaluation of radio frequency resource allocation strategy and network coding.

【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TN929.53

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相關(guān)期刊論文 前1條

1 王海榮;黃永明;楊綠溪;;聯(lián)合網(wǎng)絡(luò)編碼和疊加編碼的協(xié)作發(fā)射策略[J];通信學(xué)報;2012年08期

本文編號：1891691