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| A Transform-Domain Interference Suppressing Method in Spread Spectrum Systems Based on Near Perfect Reconstruction Cosine-Modulated Filterbank |
| Li Jian; Zhang Jia-shu |
| Si-chuan Province Key Lab of Signal and Information Processing, Southwest Jiaotong University,Chengdu 610031,China |
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Abstract The filterbank without good stopband attenuation will cause the narrowband interference power diffusing in more subbands, and the interference suppressing in transform domain may become less effective and more difficult. Accordingly, a interference suppression method is proposed based on the Near Perfect Reconstruction (NPR) cosine-modulated filterbank，which has more freedom degree in design and is more likely to implement the high stopband attenuation. The filterbank with the characteristic of high stopband attenuation can transform the narrowband interference in less subbands, and therefore has more efficiency in suppressing the narrowband interference by the conventional threshold-detecting. Simulating results show that the performance of the transform-domain interference suppression method using the NPR filterbank is better than the one using the perfect reconstruction filterbanks such as the lapped transform filterbank.
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Received: 20 February 2006
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2007, Vol. 29 
