降低随机解调器中积分置零影响的方法  

A Method of Reducing Integrator Resetting Impact in Random Demodulator

作　　者：王庆国[1] 王华力[1] 许广杰[1] 

机构地区：[1]解放军理工大学通信工程学院,南京江苏210007

出　　处：《无线电工程》2015年第4期25-28,69,共5页Radio Engineering

基　　金：国家自然科学基金资助项目(61271345)

摘　　要：针对随机解调器中积分器置零机制会带来信号损失和噪声,降低了采样系统性能的问题,提出了一种改进方法。通过对伪随机序列加窗预处理,改变随机信号的能量在积分区间内的分布,降低置零时间内信号在采样信号中的贡献,从而改善积分器置零的影响。数值仿真对随机解调采样系统的重构性能进行了检验,实验结果表明,经过改善后的系统能够降低置零机制带来的影响,提高系统的重构性能。Aiming at the problem that the integrator resetting mechanism results in signal loss,bringing about noise,reducing the sampling system performance in random demodulator,an improved method is put forward in this paper.By windowing preprocessing for pseudo-random sequence, the energy distribution of the random signal in reset integrator time interval is changed, and the contribution to the sampling signal from the signal in the resetting time interval is reduced thus the impact of the integrator resetting mechanism is improved.The numerical simulations are carried on to check the reconstruction performance of random demodulation sampling system. The experimental results show that the improved system can reduce the impact of resetting mechanism, and improve the reconstruction performance of the system.

关 键 词：积分器置零 加窗处理 随机解调器 重构性能 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]