Performance analysis of an FFT-based FFH/BFSK product-combining receiver with partial-band jamming

The performance analysis of a fast frequency-hopped binary frequency-shift- keying (FFH/BFSK) spread-spectrum (SS) system in conjunction with a fast Fo urier transform (FFT) processor is presented. Under the conditions of parti al-band jamming (PBJ) and additive white Gaussian noise (AWGN), the bit-err or rate (BER) expressions of the proposed FFT-based product-combining recei ver (PCR) are derived in terms of the characteristic functions of the decis ion statistics. The BER expressions, validated by simulation results, are a pplicable to any arbitrary diversity level. The BER results show that there is an optimum diversity level for the FFT-based PCR. The FFT-based PCR is also shown to perform better than the well known square-law linear-combinin g receiver.