摘要
交叉熵算法是目前逐步优化而形成的的一种计算方法,在解决多种优化组合的问题上具有较好的性能。在基于信道均方误差的准则下,本文基于交叉熵算法,提出一种适用于非连续正交频分复用(Non-contiguous Orthogonal Frequency Division,NC-OFDM)系统上的导频设计方法。该方法先按照伯努利分布生成导频位置的随机样本,得出信道估计的最小均方误差(Minimum Mean Square Error,MSE)的样本值,然后通过更新规则对分布参数进行更新,经过几次迭代得到较优的导频位置。仿真结果表明,使用该方法得到的信道具有更好的MSE性能及误比特率(Bit Error Rate,BER)性能。
Cross entropy is a kind of optimization method recently which shows good performance to solve combinational optimization problems. This paper,based on Minimum Mean Square Error( MSE) and cross entropy algorithm,proposes a kind of pilot design for non-contiguous orthogonal frequency division multiplexing( NC-OFDM) system. Firstly it generates samples of pilot position by Bernoulli distribution,calculates samples of MSE,and then updates distribution parameters by updating rule. Finally it gets reasonable pilot position. Simulation shows this method could achieve good MSE performance and bit error rate( BER)performance.
出处
《计算机与现代化》
2017年第10期62-65,共4页
Computer and Modernization