摘要
对于无法达到定时同步门限的微弱信号,天线组阵技术是有效的解决方法,能够提高信号的接收质量。针对信噪比低、频域上信号之间保护间隔窄的该类信号最佳合成权值估计问题,提出了一种合成权值盲估计算法。该算法充分考虑信号间的关系,利用信号的二阶矩和噪声的相关特性,实现合成权值盲估计,解决了信号合成中权值估计的通用性问题。理论分析和仿真结果表明,该算法能适用于在未知信号信噪比、调制方式、带宽以及中心频率偏差下的信号合成,而且计算量简单,易于实现。
Aiming at computing the optimum combining weight for antenna arraying in the condition of low SNR and guard interval in frequency domain between multi-signals,this paper presented a blind combining weight estimation algorithm using signal’s second order moment. The algorithm didn’t depend on single signal’s SNR,utilized the relation among multi-signals and the noise power spectral model to determine combining weight,achieving currency weight estimation in signal combining. Ttheoretical analysis and simulations are carried out to present the algorithm’s performance,results show that the algorithm can be used in many cases,such as unknown signal’s SNR,different modulation and signal bandwidth along with frequency offset,and have achieved preferable performance and low computational complexity which are proper for hardware implementation.
出处
《计算机应用研究》
CSCD
北大核心
2010年第10期3747-3749,共3页
Application Research of Computers
关键词
天线组阵
合成权值
二阶矩
信噪比估计
antenna arraying
combining weight
second order moment
SNR estimation
