基于門限估計的直擴通信系統(tǒng)窄帶干擾變換域抑制方法
A transform domain technique for suppressing narrowband interference in DS-SS system based on threshold estimation
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摘要: 該文提出一種基于門限估計的直接序列擴頻(DS-SS)通信系統(tǒng)窄帶干擾變換域抑制方法。該方法對直擴通信系統(tǒng)接收信號變換域數(shù)據(jù)的分布特點進行了分析,并采用高斯分布對其作了近似.由于高斯分布的方差即為直擴信號和高斯白噪聲方差之和,因此估計出變換域數(shù)據(jù)的方差,將為頻域抑制濾波器的門限設(shè)置提供參考。該文采用最大似然比(ML)準則對方差進行了估計,從而實現(xiàn)了頻域抑制濾波器的自動門限設(shè)制。理論分析和計算機仿真結(jié)果均表明,該方法能夠有效地抑制直擴通信系統(tǒng)中的窄帶干擾。
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關(guān)鍵詞:
- DS-SS; 窄帶干擾抑制; 變換域處理; 最大似然比; 門限估計
Abstract: This paper proposes a method for narrowband interference suppression in Direct Sequence Spread System(DS-SS). The distribution of the transform domain data is analysed, and it is approximated by Gaussian distribution. The variance of Gaussian distribution is the sum of the variance of the spread spectrum signal and the variance of the noise, so if it; is estimated, it can be used as the threshold in designing the interference suppression filter. Maximum Likelihood (ML) technique is used for estimating the variance to achieve the auto-matic threshold setup. Theoretical analysis and simulation show that this method has good performance in suppressing the narrowband interference in DS-SS. -
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