超宽带系统非理想因素的联合估计算法

分析基于正交频分复用调制技术的超宽带无线通信系统中物理层受到的模拟前端非理想因素，提出一种联合估计算法。该联合估计算法能在存在频率相关性I/Q失配的情形下准确获得载波频率偏差和采样频率偏差的估计，并获得频率相关性I/Q失配和信道冲击响应的联合估计信息。系统仿真证明，该计算法能较好地适用于多载波正交频分复用超宽带系统。

Joint Estimation Algorithm of Non-ideal Effects in Ultra-wide Band System

A real-time simulation and detection system for control system of space optics remote sensing device is designed based on precise timing and multitask proportion method in Windows OS. Through external PCI device controlled by FPGA touching the computer external interrupt periodically, precise timing is realized. For work tasks order of transmitting, parse and saving is arranged newly by rule of PRI from high to low. Experimental results show that timing accuracy achieves 0.1 ms. All tasks can be executed punctually, parsed immediately and saved accurately, requirements of real-time simulation and detection are satisfied.