An Improved Algorithm of Narrow-Band Interference Rejection Based on Time-Domain Adaptive Filtering in DSSS System
- DOI
- 10.2991/cnct-16.2017.55How to use a DOI?
- Keywords
- Direct sequence spread spectrum, Narrow-Band interference, Time- domain adaptive filter, Least-mean-square algorithm
- Abstract
In Direct sequence spread spectrum (DSSS) communication system, the auto-correlation of Pseudo-Noise Code is weak while the auto-correlation of Narrow-Band Interference (NBI) is strong, so that the NBI is more predictable than the DSSS signal. The principle of time-domain anti-interference is the auto-correlation difference between DSSS signal and NBI. However, due to the existence of oversampling in the transmitter, the auto-correlation of DSSS signal increases significantly, and the difference of auto-correlation between DSSS signal and NBI will diminish. And then the traditional time-domain adaptive filter will introduce distortion to the DSSS signal in rejection of the NBI. In this paper, an improved time-domain adaptive filtering algorithm is proposed. This algorithm is based on the interpolating transversal filter and the Least-mean-square (LMS) algorithm for updating the weights adaptively. Its anti-interference ability gains about 10dB than the traditional adaptive filter under the situation of SNR/chip is greater than 50dB. Both theoretical analysis and simulations illustrate that the new algorithm has a stronger anti-interference ability and introduces less distortion to the signal under high SNR conditions. Meanwhile, it has similar performance with the traditional adaptive filter under low SNR conditions.
- Copyright
- © 2017, the Authors. Published by Atlantis Press.
- Open Access
- This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
Cite this article
TY - CONF AU - Rui-Jun WANG AU - Shi-Guang HAO AU - Shu-Yun LI AU - Sheng KE AU - Shuai WANG PY - 2016/12 DA - 2016/12 TI - An Improved Algorithm of Narrow-Band Interference Rejection Based on Time-Domain Adaptive Filtering in DSSS System BT - Proceedings of the International Conference on Computer Networks and Communication Technology (CNCT 2016) PB - Atlantis Press SP - 399 EP - 407 SN - 2352-538X UR - https://doi.org/10.2991/cnct-16.2017.55 DO - 10.2991/cnct-16.2017.55 ID - WANG2016/12 ER -