基于OFDM循环前缀LS信道估计的构造方法

提出了一种在正交频分复用系统中循环前缀频域序列（CPFS）用于最小二乘信道估计的子载波构造方法。该构造方法基于比较CPFS序列和梳状子载波序列的相关性，可使LS信道估计的精度增加。该相关性利用凸优化的方法，以子载波总体为变量及LS信道估计的最小均方误差（MSE）机制建立约束，得到优化模型并通过拉格朗日方法求得最终构造解。仿真验证表明，该构造方法得出子载波新解能使得LS估计模型下，CPFS序列的估计精度更优。

Novel restructuring method for CP-based LS channel estimation in OFDM system

A restructuring method for least square (LS) channel est ation using cyclic-prefix frequency sequences (CPFS) in orthogonal frequency division multiplexing (OFDM) system was proposed. The restructuring method was based on the relationship of CPFS and comb-pilots which made a higher LS channel estimation precision. Specifically, the relationship used a convex optimization model, the model was set up using total sub carriers as variable and mi-nimized mean square error (MSE) as the principle to generate constraint, where further the optimized restructuring result using Lagrange method was derived. Simulations verify that under the restructured total sub carriers CPFS can enhance the LS channel estimation precision.