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Adaptive two-stage filter bank based narrowband interference suppression in DSSS systems

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4 Author(s)
Fu-Wei Jiang ; ISN Nat. Key Lab., Xidian Univ., Xian ; Zhu Xiao ; Ke-Chu Yi ; Yong-Jun Sun

In this paper, we propose a cost efficient approach for narrowband interference suppression in direct sequence spread spectrum systems. Our proposed approach takes advantage of the multirate property by using cosine- and sine- modulated perfect reconstruction filter bank blocks of small size to form an adaptive two-stage tree-structured filter bank. In the first stage, an efficient complex modulated critical sampled filter bank is built to split the complex input signal into 2M real low-rate subchannel signals. The detected interfered subchannel signals are further decomposed by the second staged filter banks for narrowband interference suppression in DSSS systems. The proposed structure is cost efficient in terms of computation and storage. Simulation results demonstrate that our approach also effectively enhances the systempsilas performance.

Published in:

Signal Processing, 2008. ICSP 2008. 9th International Conference on

Date of Conference:

26-29 Oct. 2008