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13 November 2000 Use of instantaneous bandwidth for excising AM-FM jammers in direct-sequence spread-spectrum communication systems
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While spread spectrum systems are robust to many types of interference, performance can be significantly degraded if the interference is strong enough, particularly for wideband interferences. In these situations, various signal processing methods can be employed to remove, or excise the jammer prior to despreading the received signal, resulting in enhanced performance. We investigate the effects of amplitude and frequency modulated (AM-FM) jammers on the performance of direct sequence spread spectrum communication systems. We demonstrate that such jammers cause significant degradation in bit-error-rate with increasing AM on systems designed to excise FM jammers only (i.e., systems with fixed notch-width excision filters). We propose an adaptive technique that utilizes the instantaneous bandwidth of the jammer, in addition to its instantaneous frequency, to filter wideband AM- FM interference from the DSSS signal. We also investigate the effects of adapting the filter notch-depth as well, according to the instantaneous power of the jammer. Simulations demonstrate additional improvement in system performance for the proposed adaptive technique compared to fixed notch-width and fixed notch- depth excision filters.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
SeongCheol Jang and Patrick J. Loughlin "Use of instantaneous bandwidth for excising AM-FM jammers in direct-sequence spread-spectrum communication systems", Proc. SPIE 4116, Advanced Signal Processing Algorithms, Architectures, and Implementations X, (13 November 2000);


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