擴頻系統(tǒng)頻域窄帶干擾抑制算法加窗損耗研究
Study on Windowing Degradation of Frequency Domain Narrowband Interference Suppression Algorithms in Spread Spectrum System
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摘要: 擴頻系統(tǒng)頻域抗干擾算法通常采用數(shù)據(jù)加窗降低截斷引起的頻譜泄漏，采用數(shù)據(jù)重疊降低加窗帶來的信噪比損耗。該文分析了數(shù)據(jù)加窗帶來的信噪比損耗，研究了采用數(shù)據(jù)重疊后的信號合成輸出問題，在Capozza(2000)的重疊選擇輸出方法的基礎(chǔ)上提出了一種重疊相加輸出方法。理論分析和仿真結(jié)果表明，與重疊選擇輸出方法相比，重疊相加輸出方法減小了數(shù)據(jù)加窗引入的信噪比損耗，代價是增加了少量的加法運算。
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關(guān)鍵詞:
- 頻域抗干擾; 加窗損耗; 重疊; 數(shù)據(jù)合成
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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