On Adaptive Narrowband Interference Cancellers for Direct-Sequence Spread-Spectrum Communication Systems 


Vol. 28,  No. 10, pp. 967-983, Oct.  2003


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  Abstract

In wireless spread-spectrum communication systems utilizing PN (pseudo noise) sequences, a variety of noise sources from the channel affect the data reception performance. Among them, in this paper we arc concerned with the narrowband interference that may arise from the use of the spectral bands overlapped by the existing narrowband users or the intentional jammers as in military communication. The effect of this interference can be reduced to some extent at the receiver with the PN demodulation by processing gain. It is known, however, that when the interferes are strong, the reduction cannot be sufficient and thereby requiring the extra used of narrowband interference cancellers (NIC's) at the receivers. A class of adaptive NIC's are studied here based on different two cost functions. One is the chip mean-squared error (MSE) computed prior to the PN demodulation and used in the conventional cancellers. Since these conventional cancellers should be operated at the chip rate, the computational requirements are enormous. The other is the symbol MSE computed after the PN demodulation in which case the weights of the NIC's can be updated at a lot lower symbol rate. To compare the performance of these NIC's, we derive a common measure of performance, i.e., the symbol MSE after the PN demodulation. The analytical results are verified by computer simulation, As a result, it is shown that the cancellation capability of the symbol-rate NIC's are similar or better than the conventional one while the computational complexity can be reduced a lot.

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  Cite this article

[IEEE Style]

W. Jang and J. Lee, "On Adaptive Narrowband Interference Cancellers for Direct-Sequence Spread-Spectrum Communication Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 28, no. 10, pp. 967-983, 2003. DOI: .

[ACM Style]

Won-Suk Jang and Jae-Chon Lee. 2003. On Adaptive Narrowband Interference Cancellers for Direct-Sequence Spread-Spectrum Communication Systems. The Journal of Korean Institute of Communications and Information Sciences, 28, 10, (2003), 967-983. DOI: .

[KICS Style]

Won-Suk Jang and Jae-Chon Lee, "On Adaptive Narrowband Interference Cancellers for Direct-Sequence Spread-Spectrum Communication Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 28, no. 10, pp. 967-983, 10. 2003.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880