本文選題：協(xié)同通信 + 協(xié)同中繼�。� 參考：《重慶大學(xué)》2014年博士論文

【摘要】：“協(xié)同”的基本屬性是參與協(xié)作的相關(guān)實(shí)體通過(guò)貢獻(xiàn)、共享資源以實(shí)現(xiàn)某個(gè)共同目標(biāo)，并獲取額外收益。協(xié)同通信通過(guò)網(wǎng)元之間彼此共享信道資源構(gòu)成虛擬MIMO（virtual multi-input multi-output）獲得離散網(wǎng)元提供的空間分集增益或通過(guò)中繼接力傳輸擴(kuò)展覆蓋范圍、提高通信可靠性。協(xié)同通信的理論依據(jù)源于中繼信道容量能提供比直傳方式更高的信道容量這一重要結(jié)論，隨后，協(xié)同通信的研究和應(yīng)用范疇不斷擴(kuò)展，如在同構(gòu)無(wú)線通信網(wǎng)絡(luò)內(nèi)部不同終端或不同技術(shù)協(xié)同，以提高系統(tǒng)性能；在異構(gòu)無(wú)線通信網(wǎng)絡(luò)之間相互協(xié)同，以獲得“涌現(xiàn)”增益。 雖然協(xié)同的思想為無(wú)線通信的發(fā)展和應(yīng)用提供了一種新的實(shí)現(xiàn)途徑，但協(xié)同通信策略對(duì)系統(tǒng)性能也會(huì)產(chǎn)生影響，如選擇位于不同位置的網(wǎng)元參與協(xié)同，由于信道條件不同，協(xié)同能獲得的性能增益也不同；在無(wú)線通信網(wǎng)絡(luò)中，由于存在多個(gè)潛在的協(xié)同網(wǎng)元，如何從這些候選網(wǎng)元集合中快捷而有效的選取協(xié)同網(wǎng)元，是協(xié)同中繼選擇關(guān)注的重要內(nèi)容。特別地，當(dāng)多個(gè)用戶并發(fā)通信時(shí)，如何選擇協(xié)同網(wǎng)元對(duì)系統(tǒng)性能的提升最大，并考慮業(yè)務(wù)QoS（quality of service）需求、傳輸時(shí)延、性能增益以及公平性等將使問(wèn)題更加復(fù)雜。此外，基于中繼選擇的協(xié)同資源分配能進(jìn)一步優(yōu)化網(wǎng)絡(luò)性能，將中繼選擇與資源分配融合是協(xié)同策略研究的另一個(gè)重要內(nèi)容。 已有的協(xié)同中繼選擇和傳輸策略設(shè)計(jì)研究成果大多是針對(duì)單源協(xié)作應(yīng)用場(chǎng)景下的系統(tǒng)性能和分集性能分析，而針對(duì)多源多中繼、融合OFDM技術(shù)的中繼選擇以及雙向中繼傳輸?shù)确矫娴闹欣^策略和資源分配仍存在大量關(guān)鍵技術(shù)亟待深入分析研究。本文圍繞協(xié)同通信中繼選擇和傳輸策略設(shè)計(jì)展開(kāi)研究，重點(diǎn)探索OFDM下的中繼策略、高密度網(wǎng)絡(luò)的多用戶中繼策略、基于地理位置的中繼策略以及不對(duì)稱雙向中繼傳輸策略，主要內(nèi)容和成果包括： 1）針對(duì)單源多中繼單目標(biāo)協(xié)同通信應(yīng)用場(chǎng)景，研究協(xié)同傳輸與OFDM技術(shù)結(jié)合的協(xié)同中繼選擇與資源分配問(wèn)題。為消除選擇性O(shè)FDM中繼傳輸中協(xié)同分集的實(shí)現(xiàn)受制于最差配對(duì)子載波信道質(zhì)量的瓶頸，提出一種比特重加載的選擇性O(shè)FDM協(xié)同中繼方案。該方案僅選擇單中繼節(jié)點(diǎn)重傳整個(gè)OFDM符號(hào)，通過(guò)在每跳執(zhí)行自適應(yīng)比特加載并采用最小最大法選擇最佳中繼節(jié)點(diǎn)，能獲得選擇協(xié)同的中斷概率性能下界。理論分析了該中繼方案的中斷性能，并在固定傳輸速率和固定發(fā)送功率兩種情形下給出了詳細(xì)的中繼選擇和功率分配策略，通過(guò)仿真驗(yàn)證了所提方案的中斷性能和端到端可達(dá)速率。 2）針對(duì)多用戶協(xié)同MANET網(wǎng)絡(luò)，依據(jù)隨機(jī)方式或基于接收信噪比最大準(zhǔn)則選擇協(xié)作節(jié)點(diǎn)均不能通過(guò)用戶間協(xié)作獲得滿分集，而采用固定順序協(xié)作又忽略了信道狀態(tài)因素，會(huì)降低協(xié)同增益。為了獲得滿分集，提出一種基于用戶域協(xié)同和中繼域協(xié)同的兩階段自治式協(xié)同中繼選擇算法，即將協(xié)同中繼選擇過(guò)程劃分為源節(jié)點(diǎn)組中繼選擇階段和空閑節(jié)點(diǎn)組中繼選擇階段。在中繼選擇過(guò)程中，各節(jié)點(diǎn)獨(dú)立決策是否中繼和為誰(shuí)中繼，由于源節(jié)點(diǎn)組中繼選擇不能保證每個(gè)源節(jié)點(diǎn)都能找到中繼，再利用空閑節(jié)點(diǎn)組中繼選擇為未找到中繼的源節(jié)點(diǎn)選擇中繼。為了避免多個(gè)源節(jié)點(diǎn)選擇同一中繼節(jié)點(diǎn)，引入中繼域的概念，空閑節(jié)點(diǎn)集合自主形成中繼域，每個(gè)源節(jié)點(diǎn)在各自中繼域內(nèi)選取中繼。通過(guò)與固定優(yōu)先級(jí)傳輸機(jī)制，就包傳輸率和誤符號(hào)率等性能指標(biāo)進(jìn)行的對(duì)比仿真測(cè)試，驗(yàn)證了算法的有效性。 3）針對(duì)多跳移動(dòng)ad hoc網(wǎng)絡(luò)，在已知節(jié)點(diǎn)位置信息的前提下，研究基于位置信息的能效最優(yōu)中繼選擇策略。將協(xié)同通信技術(shù)引入移動(dòng)ad hoc網(wǎng)絡(luò)，根據(jù)節(jié)點(diǎn)位置信息進(jìn)行下一跳節(jié)點(diǎn)選取和相應(yīng)的中繼選擇。針對(duì)單用戶多跳場(chǎng)景，設(shè)計(jì)了一種根據(jù)位置信息判斷下一跳節(jié)點(diǎn)以及相應(yīng)的中繼節(jié)點(diǎn)選擇方案。為了提高頻譜效率，針對(duì)處于不同方位的兩用戶多跳場(chǎng)景，設(shè)計(jì)了一種能耗最小的中繼選擇方案。在下一跳節(jié)點(diǎn)選取中，利用無(wú)信標(biāo)貪婪前傳和無(wú)信標(biāo)恢復(fù)前傳分別在前向步進(jìn)區(qū)域和后向步進(jìn)區(qū)域進(jìn)行下一跳節(jié)點(diǎn)選�。辉谥欣^選擇中，根據(jù)節(jié)點(diǎn)位置信息，以系統(tǒng)能耗為優(yōu)化目標(biāo)，設(shè)計(jì)了一種基于位置的優(yōu)先級(jí)判定和中繼選取策略。 4）針對(duì)AF-OFDM雙向中繼系統(tǒng)，研究不對(duì)稱通信需求約束下系統(tǒng)總能效優(yōu)化策略。由于兩個(gè)用戶具有不同的通信速率要求，為速率要求高者分配更多的子載波；由于兩個(gè)用戶分配的子載波數(shù)不同，一部分子載波將工作在雙向傳輸模式，而另一部分子載波將工作在單向傳輸模式。以系統(tǒng)能效為優(yōu)化目標(biāo)，構(gòu)建聯(lián)合中繼傳輸模式選擇、功率分配和比特加載的組合優(yōu)化模型。針對(duì)該混合整數(shù)規(guī)劃問(wèn)題，提出一種結(jié)構(gòu)近似優(yōu)化算法。算法運(yùn)行分為兩階段：第一階段，固定子載波分配集合，優(yōu)化單向中繼傳輸和雙向中繼傳輸?shù)墓β史峙洌瑢⒃瓋?yōu)化問(wèn)題分解為兩個(gè)子優(yōu)化問(wèn)題求解；第二階段，利用子載波配對(duì)形成的線性結(jié)構(gòu)搜索雙向中繼傳輸?shù)淖罴炎虞d波數(shù)，避免窮舉搜索造成的大運(yùn)算量。
[Abstract]:The basic attribute of "synergy" is that the related entities involved in collaboration contribute to the sharing of resources to achieve a common goal and gain additional benefits. The cooperative communication is a virtual MIMO (virtual multi-input multi-output) sharing channel resources among the network elements to obtain the spatial diversity gain or through relay connection provided by the dispersed network element. The theoretical basis of cooperative communication is based on the capacity of the relay channel to provide an important conclusion that the channel capacity is higher than the direct transmission mode. Subsequently, the research and application category of cooperative communication is expanding, for example, the coordination of different terminals or different technologies within the isomorphic wireless communication network, High system performance; synergy between heterogeneous wireless communication networks to gain "emergent" gain.
Although the cooperative idea provides a new way for the development and application of wireless communication, the cooperative communication strategy will also affect the performance of the system. For example, the performance gain is different because of the different channel conditions. How to select the cooperative network element quickly and effectively from these candidate network elements is an important content of cooperative relay selection. In particular, how to select the cooperative network element to improve the performance of the system when multiple users are concurrently communicating, and consider the service QoS (quality of service) requirement, transmission delay and sex Energy gain and fairness will make the problem more complex. In addition, cooperative resource allocation based on relay selection can further optimize the performance of the network. The fusion of relay selection and resource allocation is another important part of the research of cooperative strategy.
The existing research results of cooperative relay selection and transmission strategy design are mostly aimed at system performance and diversity performance analysis in single source cooperative application scenarios. For multi source and multi relay, the relay selection and two-way relay transmission, such as relay selection and two-way relay transmission, still exist a large number of key technologies, and there are still a large number of key technologies. This paper focuses on the relay selection and transmission strategy design of cooperative communication, focusing on the relay strategy under OFDM, the multi user relay strategy of high density network, the relay strategy based on the geographic location and the asymmetric two-way relay transmission strategy. The main contents and results include:
1) aiming at the single source multi relay single target cooperative communication application scenario, the cooperative relay selection and resource allocation problem combined with the cooperative transmission and OFDM technology is studied. In order to eliminate the bottleneck in the quality of the worst matched sub carrier channel in the selective OFDM relay transmission, a selective OFDM collaboration with bit reloading is proposed. The scheme only chooses the single relay node to retransmit the whole OFDM symbol. By performing adaptive bit loading in each hop and selecting the best relay node with the minimum maximum method, this scheme can obtain the lower bounds of the probability performance of the selected cooperative. The interruption performance of the relay scheme is analyzed theoretically, and the fixed transmission rate and the fixed transmission power are fixed. In the two case, detailed relay selection and power allocation strategy are given, and the interrupt performance and end to end achievable rate of the proposed scheme are verified by simulation.
2) aiming at multi user cooperative MANET network, the cooperative nodes can not get full diversity through the cooperation between users according to the random mode or the maximum criterion based on the reception signal to noise ratio, and the cooperative gain will be reduced by using the fixed sequence cooperation and ignoring the channel state factors. In order to obtain full diversity, a kind of user domain collaboration and relay is proposed. The two phase autonomous cooperative relay selection algorithm of domain collaboration is divided into the source node group relay selection stage and the free node group relay selection stage. In the relay selection process, the nodes independently decide whether to relay and relay the relay, because the source node group relay selection cannot guarantee that each source node can be used. In order to avoid multiple source nodes select the same relay node, to avoid multiple source nodes to select the same relay node, the concept of the relay domain is introduced. The free node sets form the relay domain independently. Each source node selects the relay in the respective relay domain. The performance of the packet transmission rate and the symbol error rate are compared and simulated, and the effectiveness of the algorithm is verified.
3) aiming at the multi hop mobile ad hoc network, the optimal relay selection strategy based on location information is studied on the premise of the location information known. The cooperative communication technology is introduced into the mobile ad hoc network to select the next hop node and the corresponding relay selection according to the node location information. A kind of root is designed for the single user multi hop scene. According to the location information, the next hop node and the corresponding relay node selection scheme are determined. In order to improve the spectrum efficiency, a relay selection scheme is designed for the minimum energy consumption for the multi hop multi hop scene in different directions. In the next hop node selection, the forward and unbeacless forward passes are used in the forward step respectively. In the relay selection, a position based priority decision and relay selection strategy is designed in the relay selection, based on the location information of the node and the system energy consumption as the optimization goal.
4) aiming at the AF-OFDM two-way relay system, the total energy efficiency optimization strategy under the demand constraint of asymmetric communication is studied. Because two users have different communication rate requirements, more subcarriers are allocated for the higher rate required. Because the number of subcarriers allocated by the two users is different, some subcarriers will work in the bidirectional transmission mode, and the other is the other. A molecular carrier will work in a one-way transmission mode. Based on the system energy efficiency as the optimization target, a combined optimization model of joint relay transmission mode selection, power allocation and bit loading is constructed. A structure approximation optimization algorithm is proposed for the mixed integer programming problem. The algorithm runs into two stages: the first stage, fixed subcarrier division. In order to optimize the power allocation of one-way relay transmission and two-way relay transmission, the original optimization problem is decomposed into two sub optimization problems. In the second stage, the optimal subcarrier number of two-way relay transmission is searched by the linear structure formed by the subcarrier pair, so as to avoid the large amount of computation caused by the exhaustive search.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.5

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本文編號(hào)：2088723