基于Turbo原理的迭代UWB信道估计方法

Iterative channel estimation based on the Turbo principle for UWB system

针对UWB系统室内密集离散多径信道,提出一种基于Turbo原理的无训练比特的迭代信道估计方法和接收机结构。在迭代信道估计过程中,译码器输出的软信息反馈给信道估计模块,作为信道估计的先验信息使用。以有效提高信道利用率和接收机的性能。仿真结果表明,该信道估计方法能够有效估计信道参数,并且对于信道变化具有较强的跟踪估计能力。

An iterative channel estimation algorithm and receiver structures based on Turbo principle were proposed for estimating channel parameters in a TH-UWB system under the realistic UWB channel model from IEEE 802.15. In each iteration, the soft-output of decoder is fed back to the channel estimation module, and used as the prior information, which means no training sequences are used. The performance of the proposed iterative channel estimation algorithm in UWB dense multipath channels is evaluated. The numerical results show that the new algorithm can efficiently estimate channel parameters, and moreover, can efficiently track the time-variant of the channel.