Abstract
In this paper, we consider the performance evaluation and determine the advantages and limitations of diversity applied to M-ary frequency shift keying (MFSK) signals based on the balanced incomplete block design (BIB-D), with postdetection noncoherent diversity reception and combining over slow nonselective Nakagami m-distribution fading channels. This modulation scheme is referred to as multiple tone MFSK (MT-MFSK), where each MT-MFSK signal is represented by a number of distinct orthogonal tones selected according to BIB-D and the number of tones used to represent the signals set is reduced compared to the conventional MFSK modulation. This mechanism drastically increases the bandwidth efficiency of the modulated signal and allows the modulator to create implicit frequency diversity. This paper shows that by combining the implicit frequency diversity of MT-MFSK signals with the diversity reception introduced by employing multiple receiving antennas, substantial improvements in performance can be achieved compared to the conventional MFSK system in power and bandwidth efficiency.
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