Jamming and Fading Channels Mitigation Using Anti-Jamming Advanced Frequency Hopping
Walid M. Saad, Ian Marsland · 2012
Performance degradation caused by channel dispersion can be mitigated using avoidance techniques such as frequency hopping spread spectrum. Adaptive frequency hopping techniques such as matched frequency hopping (MFH), clipped matched frequency hopping (CMFH) and advanced frequency hopping (AFH) have been introduced as efficient techniques in slowly fading dispersive channels. These techniques work by adaptively selecting a subset of frequencies over which hopping is performed, in an attempt to avoid severely attenuated frequencies. This paper contains a comparison of the performance of these techniques when smart jamming signals interfere with the transmission in addition to frequency selective fading. Modifications to these techniques are then proposed that provide greater resilience to jamming. In particular, the proposed anti-jamming advanced frequency hopping (AJAFH) technique is shown to be very effective in jamming environments, providing much higher throughput than the existing techniques.