A new technique for narrowband interference cancellation in half duplex spread spectrum communications

A new system for narrowband interference rejection in a two-way spread spectrum (SS) communication is presented. The system employs the inherent capability in a two-way Frequency Hopping (FH) channel to entirely reject these hops hit by intentional or unintentional narrowband interference. Following the initial acquisition of synchronization, the system undergoes a (Testing-Telling) process, and once these interference tones are detected, simple convolutional codes can be effectively used with no interleaving or complicated sequential decoding. Error bounds are formulated for the case of a noncoherent Frequency Shift Keying (FSK) channel under a worst case jamming plus White Gaussian Noise. These bounds show the superiority of the new technique for narrowband interference rejection in a two-way channel.