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Interference rejection techniques in spread spectrum communications

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1 Author(s)
Milstein, L.B. ; Dept. of Electr. & Comput. Eng., California Univ., San Diego, CA, USA

It is argued that the ability of a spread-spectrum system to withstand interference, both intentional and unintentional, is probably its greatest asset. Any spread spectrum receiver can only suppress a given amount of interference; if the level of interference becomes too great, the system will not function properly. Even under these latter circumstances, however, other techniques, which enhance the performance of the system over and above the performance improvement that comes automatically to systems from using spread spectrum, are available for use. These techniques typically involve some type of additional signal processing and are examined here. Two general types of narrowband interference suppression schemes are discussed and an overview is presented for several other techniques. The two classes of rejection schemes emphasized are (1) those based on least-mean-square estimation techniques, and (2) those based on transform-domain processing structures

Published in:

Proceedings of the IEEE  (Volume:76 ,  Issue: 6 )