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 detector samples are nonlinearly combined, forming an 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 diversity and severity of fading including the additive white Gaussian noise. The results obtained show that like in case when no fading is present diversity improvement is realised for all the receiver combining schemes. Best performances are achieved for AGC receiver, while the worst are obtained for ratio statistic receiver.