Title :
Adaptive interference rejection in a digital direct sequence spread spectrum receiver
Author :
Goiser, A. ; Sust, M.
Author_Institution :
Tech. Univ. of Vienna, Austria
Abstract :
To improve system performance in the presence of continuous-wave (CW) interference, a 2-b analog-to-digital converter (ADC) with adaptive thresholds has been implemented in a DSSS (direct-sequence spread-spectrum) receiver for code-shift-keyed signals. The theoretical and measured system performance of a hard limiter and the adaptive 2-bit ADC to accomplish analog-to-digital (A/D) conversion in the DSSS receiver are compared for AWGN (additive white Gaussian noise), CW, and combined AWGN-CW interference. The system´s dynamic response to changes in signal or interference conditions is investigated by means of Monte-Carlo simulations. Both steady-state and dynamic behavior of the 2-b ADC are satisfying in the presence of strong CW interference. However, if the AWGN contribution is dominant, there is no significant difference in the performance of the hard limiter and the 2-b ADC
Keywords :
Monte Carlo methods; analogue-digital conversion; interference suppression; radio receivers; random noise; spread spectrum communication; AWGN; CW interference; Monte-Carlo simulations; adaptive 2-bit ADC; adaptive interference rejection; adaptive thresholds; additive white Gaussian noise; analog-to-digital converter; code-shift-keyed signals; digital direct sequence spread spectrum receiver; dynamic response; hard limiter; signal changes; steady-state behavior; system performance; AWGN; Bit error rate; Digital filters; Europe; Filtering; Hardware; Interference; Matched filters; Quantization; Spread spectrum communication;
Conference_Titel :
Military Communications Conference, 1989. MILCOM '89. Conference Record. Bridging the Gap. Interoperability, Survivability, Security., 1989 IEEE
Conference_Location :
Boston, MA
DOI :
10.1109/MILCOM.1989.103980
