Comparison of FFH FSK nonlinear combining receivers in a fading channel with partial-band interference

In this paper the comparison of error probabilities achieved by four nonlinear diversity combining schemes for Fast Frequency Hopping (FFH) BFSK in a fading channel with worst-case partial-band jamming is made. In studied schemes, the quadratic defector samples ave nonlinearly combined, forming in that way adaptive gain control (AGC) receiver self-normalizing (SNORM) receiver, clipped diversity combining (CDC) receiver and ratio statistic (RS) receiver. The bit error probability is examined for different levels of diversify and severity of fading including the additive white Gaussian noise in the analysis. The results obtained show that, like in case when no fading is present diversify improvement is realised for all the receiver combining schemes. Best performances ave achieved for AGC receiver while the worst are obtained for ratio statistic receiver.