| Direct sequence spread spectrum is a rapidly developed communication technology;therefore, it has been widely applied in the military field as well as in the civil. Its capability ofnarrow-band interference suppression is one of its outstanding advantages, it can suppresspowerful intentional or unconscious narrow-band interference from channel, but when outsideinterference might be more powerful than accepted tolerance, system can't wok on the rails.Therefore it is necessary to introduce corresponding interference suppressing measures forimproving system performance to make system achieve communications task efficiently in thepowerful interference environment.This paper studies transform domain narrow-band interference suppression technology,which separates signal from interference among many narrow-band interference suppressingtechnology in DSSS. Therefore it is has become one of research hotspots of communicationtechnology at present. But transform domain narrow-band interference suppression measureshas many kinds, this paper mostly studies frequency interference suppression measure, which isused most extensively and can deal with many interference and can be quickly adaptiveThis paper expatiate on characters of spreading frequency communication system, studieswork principle and narrow-band interference suppression principle of DSSS, mostly studiestransform domain disposal algorithm—adaptive filter algorithm, analyzes localization of timedomain LMS.This paper mainly studies fixed step frequency domain BLMS algorithm and analyzescharacters of the algorithm. This paper aims at the localization of frequency domain BLMSalgorithm, improves the algorithm, and presents a variable step-size adaptive BLMS algorithmin frequency domain by combining frequency domain BLMS fast algorithm with variablestep-size technique, makes computer simulation. It is to judge performance of algorithm basedon the improvement of bit error rate and power spectrum and convergence in the process ofsimulation. |
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