Accession Number : ADA259650


Title :   Kalman Filter-Based Architectures for Interference Excision


Descriptive Note : Technical rept.,


Corporate Author : DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)


Personal Author(s) : Kozminchuk, Brian


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a259650.pdf


Report Date : Dec 1991


Pagination or Media Count : 37


Abstract : This report presents a novel Kalman filtering approach to the suppression of narrowband interference from direct sequence spread spectrum communications systems. The algorithm is based on the digital phase-locked loop Kalman filter. Because the interference is assumed to be much stronger than either the signal or noise, the Kalman filter locks onto a function related to the interference. The net result is an estimate of the phase of the interference and its amplitude. The algorithm is characterized through computer simulation for the case of narrowband Gaussian noise interference. Examples of the phase- and envelope-tracking capabilities of the algorithm are presented, followed by bit error rate curves for interference bandwidths ranging from 0.5% to 5.0% of the chip rate of the spread spectrum signal. The report concludes with three adaptive architectures. -The first is suitable for constant envelope interference; the second is a more general structure; and the third incorporate a decision-feedback structure accompanied with a training sequence.


Descriptors :   *KALMAN FILTERING , *SPREAD SPECTRUM , *INTERFERENCE ANALYZERS , *PHASE LOCKED COMMUNICATIONS , ALGORITHMS , FUNCTIONS , SIMULATION , TRAINING , COMPUTERS , SEQUENCES , ESTIMATES , SIGNALS , LOOPS , AMPLITUDE , BANDWIDTH , ARCHITECTURE , NOISE , FILTERS , INTERFERENCE , ERRORS , CONSTANTS , APPROACH , FILTRATION , NETS , NARROWBAND , EXCISION , SUPPRESSION , FEEDBACK , PHASE , TRACKING , THEORY , STRUCTURES , RATES , GAUSSIAN NOISE


Subject Categories : Electricity and Magnetism
      Radio Communications


Distribution Statement : APPROVED FOR PUBLIC RELEASE