一种用于空间分集信号合成的时差消除方法-《计算机技术与发展》

文章信息/Info

Title:: Method of Time Delay Elimination for Space Diversity Signal Combination

Keywords:: time-delay estimation; cross-correlation algorithm; interpolator; space diversity; signal combination

摘要:: 文中针对分别接收两路相同的卫星信号并对其进行合成的问题,提出了一种适用于高数据速率卫星通信的空间分集信号合成方法.它采用离散傅里叶变换的方法,将时域中的积分运算转化为频域的乘积运算,再通过傅里叶反变换求出其最大值和最大值的位置,实现了时差的估计.仿真结果表明,通过该时差消除方法获得的合成效果,与理论值相比存在0.3dB的损失,但系统仍能在信噪比是3dB的条件下正常工作.该时差消除方法可应用于高数据速率的X频段卫星通信中

Abstract:: Aiming at the problem of respectively receiving two way the same satellite signal and carrying on the synthesis,propose a meth-od of time delay elimination for space diversity signal combination which could be applied in satellite communication with high data rate. By DFT method,transfer integration of time-domain into product of frequency-domain,again through IDFT find out the maximum value and the location of the maximum,realizing the time-delay estimation. The simulation results show that,by the time difference method for eliminating obtain the synthesis effect,compared with the theoretical value has 0. 3dB loss there,but the system can still work under the condition of the signal-to-noise ratio is 3dB. This method can be applied to high data rate X band satellite communications