LTE系统中基于改进样条插值的信道估计方法

上行控制信道（PUCCH）格式1/1a/1b在长期演进（LTE）系统中承载重要的控制信令 ，其信道估计对系统性能有着重要影响。普通循环前缀（CP）时，PUCCH格式1/1a/1b要利用 时隙内3个连续排放的导频进行插值需要考虑二阶插值或者三次样条插值。为了使其在TD-L TE测试仪表系统中得到高效实现，分析了两种插值算法，并提出改进的三次样条插值算法， 即采用逐步外推的插值思想估计时隙内边缘的数据符号，通过离线完成大部分运算，使得信 道估计的实现在减小复杂度的同时还降低了误比特率。

A Channel Estimation Algorithm Based on Improved Spline Interpolation in LTE Systems

In the Long Term Evolution(LTE) system,the physical uplink control channel( PUCCH) format 1/1a/1b carries important control information, channel estimation of which has great impact on the system performance. In the condition of normal cyclic prefix(CP), the second order or spline interpolation should be considered for PUCCH format 1/1a/1b to exploit three con tinuous pilots in one slot. To implement it effic iently in the TD-LTE test system,two interpolation algori thms are analysed and a better algorithm based on spline is proposed.The thought of stepwise extrapolation is adopted in the algorithm to estimate the data at t he edge of the slot, and most of the computations are performed offline resultin g in high performance at complexity reductions.