本文選題：雙向中繼 + 放大轉(zhuǎn)發(fā)　； 參考：《西安電子科技大學(xué)》2014年碩士論文

【摘要】：隨著移動通信的高速發(fā)展,人們對數(shù)據(jù)速率和服務(wù)質(zhì)量的要求也越來越高。然而,由于傳統(tǒng)的無線通信技術(shù)的限制,人們的通信體驗并沒有得到很好地滿足。為了解決這種突出的矛盾,通信領(lǐng)域的專家們一直在探尋并不斷提出了許多高效的通信技術(shù)用以改善用戶體驗,如OFDM技術(shù)、MIMO技術(shù)、協(xié)作中繼技術(shù)等等。其中,中繼技術(shù)因具有擴大小區(qū)覆蓋范圍、提高系統(tǒng)容量、改善小區(qū)邊緣用戶性能等諸多優(yōu)點,受到了人們的廣泛關(guān)注。協(xié)作中繼技術(shù)分為單向和雙向兩類。與單向中繼技術(shù)相比,雙向中繼具有更高的頻譜效率,因而具有更強的實用價值。因此,本文即以雙向AF中繼通信系統(tǒng)為研究背景,先后深入研究了單天線場景下的機會中繼選擇機制和多天線場景下的OSTBC(正交空時分組碼)傳輸方案。本文的主要工作體現(xiàn)在以下兩點:1.針對單天線雙向多中繼場景,為了提升系統(tǒng)性能,以最小化系統(tǒng)中斷概率為優(yōu)化目標,首先介紹了典型的基于最大最小準則的集中式中繼選擇算法。研究表明,該算法是一種中斷最優(yōu)的中繼選擇算法。為了降低算法復(fù)雜度,隨后介紹了一種簡單的分布式中繼選擇算法,該算法是一種次最優(yōu)算法,在保證較高系統(tǒng)性能的同時降低了實現(xiàn)復(fù)雜度�？紤]到實際系統(tǒng)中存在信道估計誤差和反饋時延等因素,非理想CSI(信道狀態(tài)信息)會對系統(tǒng)性能產(chǎn)生較大影響。因此,文中分析了非理想CSI條件下系統(tǒng)性能,給出了中斷概率閉合表達式,最后仿真并分析了非理想CSI對中繼選擇機制的影響。2.針對多天線雙向中繼系統(tǒng)中的正交空時分組碼傳輸方案進行了研究。首先通過介紹單天線雙向中繼平均和速率的上下界,分析了雙向中繼和速率性能的改善情況。在此基礎(chǔ)上,針對兩源節(jié)點均配備雙天線并采用Alamouti OSTBC傳輸方案、中繼只配備單天線并采用放大轉(zhuǎn)發(fā)協(xié)議的雙向中繼場景,文中分析了該方案的平均和速率上下界以及PEP(成對錯誤概率)上界,同時給出了兩種雙向中繼方案的最優(yōu)功率分配。研究結(jié)果表明,雙向中繼能極大地減少傳統(tǒng)單向中繼的頻譜效率損失,與單天線情況相比,OSTBC方案能獲得更高的和速率,并且能夠獲得2階分集階數(shù)。接下來,對以上討論的Alamouti空時碼傳輸方案進行了推廣,擴展到雙向中繼系統(tǒng)中源節(jié)點和中繼節(jié)點具有任意天線數(shù)時如何使用正交空時分組碼進行通信,并對該模型下的誤符號率性能進行了理論分析,最后的仿真結(jié)果驗證了理論分析的正確性。
[Abstract]:With the rapid development of mobile communication, the demand of data rate and quality of service is becoming higher and higher. However, due to the limitation of traditional wireless communication technology, people's communication experience is not well satisfied. In order to solve this outstanding contradiction, communication experts have been exploring and proposing many efficient communication technologies to improve the user experience, such as OFDM technology, MIMO technology, cooperative relay technology and so on. Among them, relay technology has attracted wide attention because of its advantages such as expanding the coverage of the cell, increasing the system capacity and improving the performance of the edge users of the cell. Cooperative relay technology can be divided into two categories: one-way and two-way. Compared with one-way relay technology, bidirectional relay has higher spectral efficiency and more practical value. Therefore, based on the bidirectional AF relay communication system, this paper has studied the opportunity relay selection mechanism in single antenna scene and the OSTBC (orthogonal space-time block code) transmission scheme in multi-antenna scene. The main work of this paper is reflected in the following two points: 1. In order to improve system performance and minimize system outage probability, a typical centralized relay selection algorithm based on maximum-minimization criterion is introduced for single-antenna bidirectional multi-relay scenarios. The research shows that this algorithm is an optimal relay selection algorithm with interrupt. In order to reduce the complexity of the algorithm, a simple distributed relay selection algorithm is introduced, which is a sub-optimal algorithm, which can reduce the implementation complexity while ensuring high system performance. Considering that the channel estimation error and feedback delay exist in the real system, the non-ideal CSI (channel state information) will have a great impact on the performance of the system. Therefore, the system performance under the condition of non-ideal CSI is analyzed, and the closure expression of interrupt probability is given. Finally, the influence of non-ideal CSI on relay selection mechanism is simulated and analyzed. The transmission scheme of orthogonal space-time block codes in multi-antenna bidirectional relay system is studied. Firstly, by introducing the upper and lower bounds of the average and rate of bidirectional relay with single antenna, the improvement of the performance of bidirectional relay and rate is analyzed. On this basis, the two source nodes are equipped with two antennas and adopt Alamouti OSTBC transmission scheme. The relay is only equipped with a single antenna and adopts the amplification and forwarding protocol in the bidirectional relay scene. In this paper, the upper and lower bounds of average and rate and the upper bound of PEP (pairwise error probability) are analyzed, and the optimal power allocation for two bidirectional relay schemes is given. The results show that bidirectional relay can greatly reduce the loss of spectrum efficiency of traditional one-way relay. Compared with single antenna, OSTBC scheme can obtain higher sum rate, and can obtain the second order diversity order. Then, the Alamouti space-time code transmission scheme discussed above is extended to how to communicate with orthogonal space-time block code when the source node and relay node have any number of antennas in the two-way relay system. The performance of symbol error rate in this model is analyzed theoretically, and the simulation results verify the correctness of the theoretical analysis.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.5

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