The Performance of Frequency Hopped Adaptive Arrays with an Injected Pilot Signal

In this paper, we discuss the use of a pilot signal to decrease the transient output SINR degradation when the desired signal is hopping. We describe the system which uses a pilot signal transmitted at the beginning of every hop epoch. In this system the weights, which are well adapted by the pilot signal, will be stored as the initial values of all frequency hops in that hop epoch. The initial weight vectors of all hops are well adapted by the pilot signals because the initial values and the frequency hops do not affect each other; this means that all hops are relatively independent from one another. Even if some of the hopped channels are significantly jammed, the performance of the next hop won´t be affected.