DIRECT-SEQUENCE SPREAD-SPECTRUM WITH TRANSFORM DOMAIN INTERFERENCE SUPPRESSION

The performance of a direct-sequence spread-spectrum (DS-SS) receiver employing new techniques for multiple non-stationary interference supp ression is presented. These techniques are based on transform domain o rder statistics and they selectively suppress spectral components that are sufficiently large and narrow. Other important advantages are als o discussed. The bit error rate performance is determined by Monte-Car lo simulations and it is compared to the performance of fixed notch fi ltering and of the well-known LMS algorithm. The effect of using data windowing is examined, and results with single-tone, narrow-band, stat ionary, non-stationary and multiple interference are presented. A comp arison of the amount of computation required by the proposed transform domain approach to that of the time-domain LMS algorithm is also pres ented.