MULTIPLE HOPS SYMBOL FFH-SSMA WITH MFSK MODULATION AND REED-SOLOMON CODING FOR INDOOR RADIO

This paper is concerned with a multiple hops per symbol fast-frequency-hopped spread-spectrum multiple-access (FFH-SSMA) system for indoor radio communication. The data are Reed-Solomon (RS) encoded, and then modulate a carrier by means of M-ary frequency-shift-keying (MFSK). The indoor radio channel is described as a multipath (Rayleigh or Rician) slowly fading channel. The receiver uses predetection diversity by linearly combining the squared envelopes of the different hops of the same MFSK symbol. We evaluate the bit error rate (BER) performance and investigate how performance is influenced by various parameters, such as the number of hops per symbol, the size of the symbol alphabet, the ratio of specular power to fading power, and the ratio of nonreference user power to reference user power.