毕业设计_基于注水算法的蜂窝网络功率分配算法与仿真.doc

 基于注水算法的蜂窝网络功率 分配算法与仿真 摘 要 随着信息大爆炸时代的来临，信息输出的压力日益增大，无线通信行业正经历着窄带、电路交换系统到宽带、基于IP平台的重大变革。在这个向宽带的演化中，一个共同的主题就是FDM的使用和开放的网络架构及如何在有限的基站输出功率情况下产生最大的效率。 本文结合了先进的OFDM(Orthogonal Frequency Division Multiplexing) ，即正交频分复用技术。OFDM的优点是，可以减少子信道之间的相互干扰 ICI 、每个子信道上的信号带宽小于信道的相关带宽、每个子信道上的可以看成平坦性衰落、消除码间串扰。以OFDM为多蜂窝系统功率分配模型，以功率注水算法为依托。提出了改良版的注水算法，即在注水算法前加以价格参量，信道状况好的时刻，多分配功率，信道差的时候，少分配功率，从而最大化传输速率。并且在功率分配时特别在蜂窝间同频子载波干扰严重的情况下，相对于完全非合作博弈论的低效和合作博弈论的庞大开销，引入价格参量的注水算法而分配出来的功率应是每个子载波的最优解，从而可以很方便的实现功率效用的最大化。 OFDM；注水算法；价格控制；功率分配 ALLOCATION ALGORITHM AND SIMULATION OF CELLULAR NETWORKS BASED ON WATER POWER Abstract With the advent of a new era of the information explosion, the pressure of information output is increasing, and the wireless communications industry is experiencing a narrowband, circuits-switched to broadband, major changes in IP-based platform. It has become increasingly serious about how to generate maximal effectiveness in the limited base stations output. This thesis integrates with the advanced OFDM system, OFDM is the orthogonal frequency division multiplexing. It can reduce the mutual interference between ICI (inter-carrier interference) sub-channels. Signal is less than the bandwidth of each sub-channel coherence bandwidth for the channel; each sub-channel can be regarded as flat fading, which can eliminate inter-symbol interference. This paper takes OFDM as the power allocation of multi-cellular systems model, relying on Water-filling algorithm. Water-filling algorithm is controlled by the responsiveness of a link adaptation and dynamically updated along with channel condition, the better Channel conditions are, the more power distribution will get. In this paper, a water-filling algorithm that is proposed to dynamically allocate transmit power, which is reflected by the resource price fluctuation is adopted to allocate adaptively. The improved multiuser water-filling algorithm with the price is used to determine the power allocation, realizing to the low e