认知双向中继系统中断性能及功率分配技术研究
发布时间：2019-02-16 04:32
【摘要】：近年来,移动通信事业蓬勃发展使得电子信息社会化程度越来越高,人们对数据的传输速率以及服务质量等方面的要求也越来越高。更高覆盖率、高速率、高服务质量、低成本、低功耗已经成为未来无线通信系统发展的新趋势。然而,频谱资源的稀缺性和有限性以及无线传输环境的不确定性与时变性严重制约了未来无线通信技术的发展。认知无线电(CR)技术的提出提高了频谱利用率,解决了当前频谱紧缺问题。同时,作为新一代的协同通信技术,双向中继已经成为当前无线通信系统中的研究热点,借助于物理层网络编码技术,双向中继系统吞吐性能和频谱利用率得到了进一步地提高。本论文针对利用模拟网络编码(ANC)技术的认知双向中继系统展开了分析,对特定的场景进行了系统地研究,提出了几种优化功率分配策略并进行了理论分析与计算机仿真验证。本论文的主要研究成果如下:1.在CR网络场景下,针对传统的双向中继系统,引入了ANC技术并进行了研究。在瑞利衰落信道环境下,充分考虑授权用户与未授权用户之间的干扰,对该经典场景进行了系统分析,同时,对该认知双向中继网络中断性能进行了研究,推导出了其在理想信道估计条件下和非理想信道估计条件下的单向传输中断概率的近似表达式,并通过仿真验证了推导与分析的正确性。2.针对认知场景下利用ANC的双向中继系统,为了保证授权用户和非授权用户的服务质量,针对该特定的场景提出了两种具体的功率分配方案:(1)在对称传输速率要求下,提出了基于最小化最大单向传输中断概率的功率分配方案,在理想信道估计条件下给出了该方案的闭式解表达式;在非理想信道估计条件,采用一维精确搜索的方法实现了优化功率分配。仿真结果表明,与传统的等功率分配(EPA)方案相比,提出的功率分配方案有效地提高了未授权用户的中断性能。(2)在非对称传输速率要求下,针对理想信道估计情况提出了最大化成功传输比特和速率的功率分配方案,并给出了最优功率分配方案的闭式解表达式。在非理想信道估计情况下,分析了信道估计误差对所提出功率分配方案的性能影响。仿真表明,与传统的EPA方案相比,提出的功率分配方案有效地提高了未授权用户的中断性能和成功传输比特和速率性能。
[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.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN925
本文编号：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.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN925
【共引文献】
相关期刊论文 前1条
1 樊自甫;伍春玲;王金红;;基于SDN架构的数据中心网络路由算法需求分析[J];电信科学;2015年02期
相关博士学位论文 前2条
1 刘光军;安全网络编码及其应用[D];西安电子科技大学;2013年
2 唐东明;网络编码关键问题研究[D];电子科技大学;2013年
相关硕士学位论文 前1条
1 孙光昊;基于可信中心节点的安全网络编码理论与应用研究[D];广西大学;2013年
，本文编号：2424047
本文链接：https://www.wllwen.com/kejilunwen/wltx/2424047.html
