本文選題：雙向中繼網(wǎng)絡(luò) + 網(wǎng)絡(luò)編碼　； 參考：《南京郵電大學(xué)》2014年博士論文

【摘要】：隨著人們對無線通信需求的不斷增長，下一代無線通信系統(tǒng)需要提供更高的傳輸速率和可靠性。協(xié)作通信技術(shù)利用無線網(wǎng)絡(luò)中的多個節(jié)點相互協(xié)作，能有效克服無線信道衰落，提高傳輸性能。網(wǎng)絡(luò)編碼技術(shù)利用無線傳播媒介的廣播特性能夠明顯提升雙向中繼協(xié)作通信的頻譜效率。因此網(wǎng)絡(luò)編碼雙向中繼系統(tǒng)成為近年來通信領(lǐng)域研究的熱點。本論文對網(wǎng)絡(luò)編碼雙向中繼系統(tǒng)中的中繼選擇和功率分配方案進(jìn)行了深入研究。主要包括： 1）多對多中繼（Multi-Pair Multi-Relay: MPMR）解碼轉(zhuǎn)發(fā)雙向中繼系統(tǒng)（Decode-and-Forward Two-Way Relaying Networks: DF-TWRN）中繼選擇和功率分配算法的分析和設(shè)計。首先建立DF-TWRN系統(tǒng)的性能解析分析方法，獲得了高信噪比條件下單個DF雙向子信道誤碼率的近似表達(dá)式。然后基于上述分析，，提出了一種雙向誤碼率最低的功率分配方案，并將該方案應(yīng)用于多對多中繼系統(tǒng)，通過理論分析獲得了該場景下通過最優(yōu)功率分配得到的最小誤碼率的閉合解析解。理論分析和仿真結(jié)果表明新方案能有效降低雙向誤碼率，同時在多對多中繼系統(tǒng)中能獲得低的運算復(fù)雜度和更好的誤碼性能。 2）非對稱數(shù)據(jù)速率需求（Asymmetric Traffic Requirement: ATR）的雙向放大轉(zhuǎn)發(fā)中繼系統(tǒng)（Amplify-and-Forward Two-Way Relaying Network: AF-TWRN）中繼選擇和功率分配聯(lián)合算法的分析和設(shè)計。重點考慮了雙向速率門限不同時對雙向鏈路信噪比的優(yōu)化，通過假設(shè)檢驗得到總功率約束下新的最優(yōu)功率分配方案，并提出對應(yīng)的中繼選擇準(zhǔn)則。然后通過理論分析獲得聯(lián)合算法的系統(tǒng)中斷概率的閉合表達(dá)式（或上下邊界）；并基于已有的兩種近似邊界提出了新的近似分析方法，獲得了更緊的中斷概率下界。仿真結(jié)果證明了理論分析的正確性，表明新方案在ATR AF-TWRN網(wǎng)絡(luò)中能夠獲得比其它方案更低的中斷概率。同時通過新的近似邊界得到的中斷概率上下邊界比已有的邊界更緊，能更好地表征系統(tǒng)的中斷性能。 3）過時信道信息（Outdated CSI）雙向AF中繼系統(tǒng)的多中繼選擇方案的分析和設(shè)計。首先建立Outdated CSIAF-TWRN系統(tǒng)模型，提出一種基于標(biāo)準(zhǔn)化門限的廣義選擇合并方案。通過理論分析和合理的近似獲得了多中繼選擇方案下中斷概率、平均誤碼率以及各態(tài)歷經(jīng)容量的上下邊界，并分析該方案獲得的分集增益。然后基于上述性能分析和比較，提出了一種自適應(yīng)多中繼選擇方案。理論分析和仿真結(jié)果表明在Outdated CSI雙向通信中，多中繼選擇可以獲得更高的分集增益，同時最佳中繼個數(shù)的自適應(yīng)選擇能夠有效減少低信噪比區(qū)間多中繼選擇算法各態(tài)歷經(jīng)容量的損失，提升系統(tǒng)的中斷性能。
[Abstract]:With the increasing demand for wireless communication, the next generation wireless communication systems need to provide higher transmission rate and reliability. Cooperative communication technology can effectively overcome the fading of wireless channel and improve transmission performance by using the cooperation of multiple nodes in wireless network. Network coding technology can significantly improve the spectrum efficiency of bidirectional relay cooperative communication by utilizing the broadcast characteristics of wireless media. Therefore, network coding bidirectional relay system has become a hot topic in the field of communication in recent years. In this paper, relay selection and power allocation schemes in network coded bidirectional relay systems are studied. The main contents are as follows: 1) the analysis and design of relay selection and power allocation algorithm for Decode-and-forward Two-Way Relaying Networks (DF-TWRN) decoding and forwarding bidirectional relay system (MPMR) with Multi-Pair Multi-Relay (MPMR). Firstly, an analytical method for performance analysis of DF-TWRN systems is established, and an approximate expression of BER for a single DF bidirectional subchannel with high SNR is obtained. Based on the above analysis, a power allocation scheme with the lowest bidirectional bit error rate (BER) is proposed and applied to many-to-many relay systems. The closed analytic solution of the minimum bit error rate obtained by optimal power allocation in this scenario is obtained by theoretical analysis. Theoretical analysis and simulation results show that the new scheme can effectively reduce the bidirectional bit error rate (BER). At the same time, low computational complexity and better bit error performance can be achieved in many-to-many relay systems. 2) Asymmetric Traffic requirements: ATR Two-Way Relaying Network: AF-TWRN Relay selection and Power performance of the Amplify-Forward Two-Way Relaying Network (AF-TWRN) Analysis and design of joint rate assignment algorithm. This paper focuses on the optimization of the signal-to-noise ratio (SNR) of bidirectional links with different bidirectional rate thresholds. A new optimal power allocation scheme with total power constraints is obtained by hypothesis testing and a corresponding relay selection criterion is proposed. Then, the closed expression (or upper and lower boundary) of the system interrupt probability of the joint algorithm is obtained by theoretical analysis, and a new approximate analysis method is proposed based on the two existing approximate boundaries, and a more compact lower bound of the interruption probability is obtained. The simulation results show that the new scheme can obtain lower outage probability than other schemes in ATR AF-TWRN network. At the same time, the upper and lower boundaries of the outage probability obtained by the new approximate boundary are more compact than the existing boundaries. It can better characterize the interrupt performance of the system. 3) the analysis and design of multi-relay selection scheme for outdated channel information (Outdated CSI) bidirectional AF relay system. Firstly, the model of Outdated CSIAF-TWRN system is established, and a generalized selective merging scheme based on standardized threshold is proposed. Through theoretical analysis and reasonable approximation, the interruption probability, the average bit error rate and the upper and lower boundaries of ergodic capacity of each state under the multi-relay selection scheme are obtained, and the diversity gain obtained by the scheme is analyzed. Then, an adaptive multi-relay selection scheme is proposed based on the above performance analysis and comparison. Theoretical analysis and simulation results show that multi-relay selection can obtain higher diversity gain in Outdated CSI bidirectional communication. At the same time the adaptive selection of the optimal number of relays can effectively reduce the loss of ergodic capacity of the multi-relay selection algorithm in the low SNR range and improve the interrupt performance of the system.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TN929.5

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