CDMA系统中基于博弈论的功率速率联合控制
发布时间：2019-04-10 17:29
【摘要】：为了传输与接收多媒体信息,第三代移动通信系统(3rd-Generation,3G)需要提供高比特速率的业务。从理论上来说,频分多址(Frequency Division Multiple Access, FDMA)、时分多址(Time Division Multiple Aceess,TDMA)和码分多址(Code Divsioin Multiple Aceess, CDMA)都能应用在第三代移动通信中。由于在功率控制下的码分多址通信系统有一些特有的优点,如信道容量大、抗干扰性强以及传输功率小等。因而以WCDMA、CDMA2000为首的第三代移动通信系统都把CDMA技术作为其多址方案。由于多址干扰的原因,使得功率控制成为CDMA通信系统的关键技术。但是为了支持多业务的应用服务,单一的功率控制技术已难以进一步提高系统性能,联合功率控制成为近年来研究的热点。传统的功率控制方法是面向语音业务服务的,可分为集中式与分布式功率控制。集中式功率控制算法指出了功率控制算法性能理论上的上限,实际中采用分布式算法,并用迭代算法实现。CDMA系统中的联合功率控制过程可以看作是一个博弈过程,所有用户通过调整它的传输功率与传输速率来最大化自己的效用值,最后达到纳什均衡。本文先研究了CDMA蜂窝网下的功率控制问题,并提出了新的效用函数,相对于以往的效用函数,通过仿真表明,该算法使得用户在较小的功率下获得较高效用值。接着针对CDMA蜂窝系统中的多业务处理的飞速发展,采用非合作博弈(Non-cooperative Game, NG)理论实现功率与速率的联合控制(Joint Control of Power and Rate, JCPR)。并且提出了一种基于时延花费的代价函数,证明了该联合算法纳什均衡(Nash Equilibrium, NE)的存在性与唯一性。通过仿真表明,该算法使得用户在较小的功率下获得较高效用值,并且减少了用户的传输延时。最后研究了认知无线电中的联合功率和速率控制问题。将系统中的次级用户间的关系假定为非合作的竞争性关系,同时考虑次级用户对主用户的干扰容限,提出了基于次级用户的传输时延花费的非合作博弈联合功率速率控制算法,并证明了该算法的纳什均衡的存在性与唯一性。通过仿真表明,该算法使得用户在使用较小的传输功率的情况下获得较高效用值与较低的传输延时。同时使得次级用户对主用户的干扰小于干扰阈值。
[Abstract]:In order to transmit and receive multimedia information, the third generation mobile communication system (3G) needs to provide high bit rate services. Theoretically, both frequency division multiple access (Frequency Division Multiple Access, FDMA),) time division multiple access (Time Division Multiple Aceess,TDMA) and code division multiple access (Code Divsioin Multiple Aceess, CDMA) can be used in third generation mobile communication. Due to the power-controlled CDMA communication system has some unique advantages, such as large channel capacity, strong anti-interference and small transmission power. Therefore, the third generation mobile communication system headed by WCDMA,CDMA2000 takes CDMA technology as its multiple access scheme. Due to multiple access interference (mai), power control has become the key technology of CDMA communication system. However, in order to support multi-service applications, it is difficult for single power control technology to further improve the performance of the system. Joint power control has become a hot research topic in recent years. The traditional power control method is service-oriented for voice service, which can be divided into centralized and distributed power control. The centralized power control algorithm points out the theoretical upper bound of the performance of the power control algorithm. In practice, the distributed algorithm is used and the iterative algorithm is used. The joint power control process in CDMA system can be regarded as a game process. All users maximize their utility by adjusting their transmission power and transmission rate, and finally achieve Nash equilibrium. In this paper, the power control problem in CDMA cellular network is studied firstly, and a new utility function is proposed. Compared with the previous utility function, the simulation results show that the proposed algorithm enables users to obtain more efficient usage values at lower power. Then, in view of the rapid development of multi-service processing in CDMA cellular systems, a non-cooperative game (Non-cooperative Game, NG) theory) is used to realize the joint control of power and rate in (Joint Control of Power and Rate, JCPR). A cost function based on delay cost is proposed, and the existence and uniqueness of Nash equilibrium (Nash Equilibrium, NE) are proved. The simulation results show that the proposed algorithm can achieve high efficiency and reduce the transmission delay of users at low power. Finally, the joint power and rate control in cognitive radio is studied. The relationship between the secondary users in the system is assumed to be a non-cooperative competitive relationship, and considering the interference tolerance between the secondary users and the primary user, a joint power rate control algorithm based on the transmission delay cost of the secondary users is proposed. The existence and uniqueness of Nash equilibrium are proved. The simulation results show that the proposed algorithm enables the user to obtain higher efficiency and lower transmission delay when the transmission power is small. At the same time, the interference between the secondary user and the primary user is less than the interference threshold.
【学位授予单位】：复旦大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.533
本文编号：2455989
[Abstract]:In order to transmit and receive multimedia information, the third generation mobile communication system (3G) needs to provide high bit rate services. Theoretically, both frequency division multiple access (Frequency Division Multiple Access, FDMA),) time division multiple access (Time Division Multiple Aceess,TDMA) and code division multiple access (Code Divsioin Multiple Aceess, CDMA) can be used in third generation mobile communication. Due to the power-controlled CDMA communication system has some unique advantages, such as large channel capacity, strong anti-interference and small transmission power. Therefore, the third generation mobile communication system headed by WCDMA,CDMA2000 takes CDMA technology as its multiple access scheme. Due to multiple access interference (mai), power control has become the key technology of CDMA communication system. However, in order to support multi-service applications, it is difficult for single power control technology to further improve the performance of the system. Joint power control has become a hot research topic in recent years. The traditional power control method is service-oriented for voice service, which can be divided into centralized and distributed power control. The centralized power control algorithm points out the theoretical upper bound of the performance of the power control algorithm. In practice, the distributed algorithm is used and the iterative algorithm is used. The joint power control process in CDMA system can be regarded as a game process. All users maximize their utility by adjusting their transmission power and transmission rate, and finally achieve Nash equilibrium. In this paper, the power control problem in CDMA cellular network is studied firstly, and a new utility function is proposed. Compared with the previous utility function, the simulation results show that the proposed algorithm enables users to obtain more efficient usage values at lower power. Then, in view of the rapid development of multi-service processing in CDMA cellular systems, a non-cooperative game (Non-cooperative Game, NG) theory) is used to realize the joint control of power and rate in (Joint Control of Power and Rate, JCPR). A cost function based on delay cost is proposed, and the existence and uniqueness of Nash equilibrium (Nash Equilibrium, NE) are proved. The simulation results show that the proposed algorithm can achieve high efficiency and reduce the transmission delay of users at low power. Finally, the joint power and rate control in cognitive radio is studied. The relationship between the secondary users in the system is assumed to be a non-cooperative competitive relationship, and considering the interference tolerance between the secondary users and the primary user, a joint power rate control algorithm based on the transmission delay cost of the secondary users is proposed. The existence and uniqueness of Nash equilibrium are proved. The simulation results show that the proposed algorithm enables the user to obtain higher efficiency and lower transmission delay when the transmission power is small. At the same time, the interference between the secondary user and the primary user is less than the interference threshold.
【学位授予单位】：复旦大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.533
【参考文献】
相关硕士学位论文 前1条
1 张艳平;码分多址移动通信系统中功率速率联合控制方法研究[D];浙江大学;2004年
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