認知雙向中繼系統(tǒng)中斷性能及功率分配技術(shù)研究
發(fā)布時間：2019-02-16 04:32
【摘要】：近年來,移動通信事業(yè)蓬勃發(fā)展使得電子信息社會化程度越來越高,人們對數(shù)據(jù)的傳輸速率以及服務質(zhì)量等方面的要求也越來越高。更高覆蓋率、高速率、高服務質(zhì)量、低成本、低功耗已經(jīng)成為未來無線通信系統(tǒng)發(fā)展的新趨勢。然而,頻譜資源的稀缺性和有限性以及無線傳輸環(huán)境的不確定性與時變性嚴重制約了未來無線通信技術(shù)的發(fā)展。認知無線電(CR)技術(shù)的提出提高了頻譜利用率,解決了當前頻譜緊缺問題。同時,作為新一代的協(xié)同通信技術(shù),雙向中繼已經(jīng)成為當前無線通信系統(tǒng)中的研究熱點,借助于物理層網(wǎng)絡編碼技術(shù),雙向中繼系統(tǒng)吞吐性能和頻譜利用率得到了進一步地提高。本論文針對利用模擬網(wǎng)絡編碼(ANC)技術(shù)的認知雙向中繼系統(tǒng)展開了分析,對特定的場景進行了系統(tǒng)地研究,提出了幾種優(yōu)化功率分配策略并進行了理論分析與計算機仿真驗證。本論文的主要研究成果如下:1.在CR網(wǎng)絡場景下,針對傳統(tǒng)的雙向中繼系統(tǒng),引入了ANC技術(shù)并進行了研究。在瑞利衰落信道環(huán)境下,充分考慮授權(quán)用戶與未授權(quán)用戶之間的干擾,對該經(jīng)典場景進行了系統(tǒng)分析,同時,對該認知雙向中繼網(wǎng)絡中斷性能進行了研究,推導出了其在理想信道估計條件下和非理想信道估計條件下的單向傳輸中斷概率的近似表達式,并通過仿真驗證了推導與分析的正確性。2.針對認知場景下利用ANC的雙向中繼系統(tǒng),為了保證授權(quán)用戶和非授權(quán)用戶的服務質(zhì)量,針對該特定的場景提出了兩種具體的功率分配方案:(1)在對稱傳輸速率要求下,提出了基于最小化最大單向傳輸中斷概率的功率分配方案,在理想信道估計條件下給出了該方案的閉式解表達式;在非理想信道估計條件,采用一維精確搜索的方法實現(xiàn)了優(yōu)化功率分配。仿真結(jié)果表明,與傳統(tǒng)的等功率分配(EPA)方案相比,提出的功率分配方案有效地提高了未授權(quán)用戶的中斷性能。(2)在非對稱傳輸速率要求下,針對理想信道估計情況提出了最大化成功傳輸比特和速率的功率分配方案,并給出了最優(yōu)功率分配方案的閉式解表達式。在非理想信道估計情況下,分析了信道估計誤差對所提出功率分配方案的性能影響。仿真表明,與傳統(tǒng)的EPA方案相比,提出的功率分配方案有效地提高了未授權(quán)用戶的中斷性能和成功傳輸比特和速率性能。
[Abstract]:In recent years, with the rapid development of mobile communication, the degree of socialization of electronic information is becoming more and more high, and the requirements of data transmission rate and quality of service are becoming higher and higher. Higher coverage, high rate, high quality of service, low cost and low power consumption have become the new trend of wireless communication systems in the future. However, the scarcity and limitation of spectrum resources and the uncertainty and time-varying of wireless transmission environment seriously restrict the development of wireless communication technology in the future. The development of cognitive radio (CR) technology improves the spectrum efficiency and solves the problem of spectrum shortage. At the same time, as a new generation of cooperative communication technology, bidirectional relay has become a research hotspot in wireless communication systems, with the help of physical layer network coding technology, The throughput performance and spectral efficiency of bidirectional relay systems are further improved. In this paper, the cognitive bidirectional relay system based on analog network coding (ANC) is analyzed, and the specific scene is systematically studied. Several optimal power allocation strategies are proposed and analyzed theoretically and verified by computer simulation. The main research results of this thesis are as follows: 1. In the CR network scenario, the ANC technology is introduced and studied for the traditional bidirectional relay system. In Rayleigh fading channel environment, the interference between authorized and unauthorized users is fully considered, and the classical scenario is systematically analyzed. At the same time, the interrupt performance of the cognitive two-way relay network is studied. The approximate expression of the one-way transmission interruption probability under the condition of ideal channel estimation and non-ideal channel estimation is derived, and the correctness of the derivation and analysis is verified by simulation. 2. For the bidirectional relay system using ANC in cognitive scenarios, in order to guarantee the quality of service of authorized and unauthorized users, two specific power allocation schemes are proposed for this particular scenario: (1) under the requirement of symmetric transmission rate, A power allocation scheme based on minimizing the maximum one-way transmission interruption probability is proposed, and the closed-form expression of the scheme is given under the condition of ideal channel estimation. Under the condition of non-ideal channel estimation, one-dimensional accurate search method is used to realize optimal power allocation. The simulation results show that compared with the traditional equal-power allocation (EPA) scheme, the proposed power allocation scheme can effectively improve the interrupt performance of unauthorized users. (2) under asymmetric transmission rate requirements, the proposed power allocation scheme can effectively improve the interrupt performance of unauthorized users. For the ideal channel estimation, a power allocation scheme is proposed to maximize the successful transmission bit and rate, and the closed-form expression of the optimal power allocation scheme is given. In the case of non-ideal channel estimation, the influence of channel estimation error on the performance of the proposed power allocation scheme is analyzed. Simulation results show that compared with the traditional EPA scheme, the proposed power allocation scheme can effectively improve the interrupt performance of unauthorized users and the performance of successful transmission bits and rates.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN925
本文編號：2424047
[Abstract]:In recent years, with the rapid development of mobile communication, the degree of socialization of electronic information is becoming more and more high, and the requirements of data transmission rate and quality of service are becoming higher and higher. Higher coverage, high rate, high quality of service, low cost and low power consumption have become the new trend of wireless communication systems in the future. However, the scarcity and limitation of spectrum resources and the uncertainty and time-varying of wireless transmission environment seriously restrict the development of wireless communication technology in the future. The development of cognitive radio (CR) technology improves the spectrum efficiency and solves the problem of spectrum shortage. At the same time, as a new generation of cooperative communication technology, bidirectional relay has become a research hotspot in wireless communication systems, with the help of physical layer network coding technology, The throughput performance and spectral efficiency of bidirectional relay systems are further improved. In this paper, the cognitive bidirectional relay system based on analog network coding (ANC) is analyzed, and the specific scene is systematically studied. Several optimal power allocation strategies are proposed and analyzed theoretically and verified by computer simulation. The main research results of this thesis are as follows: 1. In the CR network scenario, the ANC technology is introduced and studied for the traditional bidirectional relay system. In Rayleigh fading channel environment, the interference between authorized and unauthorized users is fully considered, and the classical scenario is systematically analyzed. At the same time, the interrupt performance of the cognitive two-way relay network is studied. The approximate expression of the one-way transmission interruption probability under the condition of ideal channel estimation and non-ideal channel estimation is derived, and the correctness of the derivation and analysis is verified by simulation. 2. For the bidirectional relay system using ANC in cognitive scenarios, in order to guarantee the quality of service of authorized and unauthorized users, two specific power allocation schemes are proposed for this particular scenario: (1) under the requirement of symmetric transmission rate, A power allocation scheme based on minimizing the maximum one-way transmission interruption probability is proposed, and the closed-form expression of the scheme is given under the condition of ideal channel estimation. Under the condition of non-ideal channel estimation, one-dimensional accurate search method is used to realize optimal power allocation. The simulation results show that compared with the traditional equal-power allocation (EPA) scheme, the proposed power allocation scheme can effectively improve the interrupt performance of unauthorized users. (2) under asymmetric transmission rate requirements, the proposed power allocation scheme can effectively improve the interrupt performance of unauthorized users. For the ideal channel estimation, a power allocation scheme is proposed to maximize the successful transmission bit and rate, and the closed-form expression of the optimal power allocation scheme is given. In the case of non-ideal channel estimation, the influence of channel estimation error on the performance of the proposed power allocation scheme is analyzed. Simulation results show that compared with the traditional EPA scheme, the proposed power allocation scheme can effectively improve the interrupt performance of unauthorized users and the performance of successful transmission bits and rates.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN925
【共引文獻】
相關(guān)期刊論文 前1條
1 樊自甫;伍春玲;王金紅;;基于SDN架構(gòu)的數(shù)據(jù)中心網(wǎng)絡路由算法需求分析[J];電信科學;2015年02期
相關(guān)博士學位論文 前2條
1 劉光軍;安全網(wǎng)絡編碼及其應用[D];西安電子科技大學;2013年
2 唐東明;網(wǎng)絡編碼關(guān)鍵問題研究[D];電子科技大學;2013年
相關(guān)碩士學位論文 前1條
1 孫光昊;基于可信中心節(jié)點的安全網(wǎng)絡編碼理論與應用研究[D];廣西大學;2013年
，本文編號：2424047
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