扩频系统频域窄带干扰抑制算法加窗损耗研究
Study on Windowing Degradation of Frequency Domain Narrowband Interference Suppression Algorithms in Spread Spectrum System
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摘要: 扩频系统频域抗干扰算法通常采用数据加窗降低截断引起的频谱泄漏，采用数据重叠降低加窗带来的信噪比损耗。该文分析了数据加窗带来的信噪比损耗，研究了采用数据重叠后的信号合成输出问题，在Capozza(2000)的重叠选择输出方法的基础上提出了一种重叠相加输出方法。理论分析和仿真结果表明，与重叠选择输出方法相比，重叠相加输出方法减小了数据加窗引入的信噪比损耗，代价是增加了少量的加法运算。Abstract: In spread spectrum system, frequency-domain interference suppression algo-rithms always use data windows to reduce the spectral leakage associated with truncation, and employ overlap to lessen the SNR degradation due to windowing. In this paper, the windowing degradation and the data composing are studied. An improved method has been put forward to compose the data after overlap based on Capozzas(2000) method. The ana-lyzed and simulated results show that the new method leads to a less SNR degradation than Capozzas method at the cost of a few more addition.
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