Error probabilities of frequency-hopped MFSK with noise-normalization combining in a fading channel with partial-band interference

An error probability analysis is performed for a M-ary orthogonal frequency shift keying (MFSK) receiver using frequency-hopped (FH) spread-spectrum waveforms transmitted over a fading channel with partial-band interference. Diversity is performed using multiple hops per data bit. A combination procedure referred to as noise-normalization combining is used by the receiver to minimize partial-band interference effects. Each diversity reception is assumed to fade independently according to a nonselective Rician process. The partial-band interference is modeled as a Gaussian process. Thermal noise is also included in the analysis. Forward error correction coding is applied using convolutional codes and Reed-Solomon codes. Diversity is found to dramatically reduce the degradation of the noise-normalization receiver caused by partial-band interference regardless of the strength of the direct signal component. In addition, diversity offers significant receiver performance improvement when channel fading is strong