On the Availability of Multilevel CPFSK Systems with Modulation Pulse Shaping During Multipath Propagation

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Abstract
The behavior of CPFSK systems with modulation pulse shaping and limiter-discriminator detection is tested in the prsence of multipath fading. With the aim of determining the eye-closure domain, a theoretical analysis is presented for a generic number of modulation levels. It is shown that, by suitably varying the maximum angular frequency deviation ωd, control of outage probability Poutis possible. Moreover, the choice of duty-cycle in the modulation pulse\tau/T < 1leads to a lower value of Poutwith respect to the conventional case\tau/T = 1, if we fix, as happens in practice, an upper bound in the transmitted power. This promising characteristic deeply differentiates the CPFSK from the PSK, DCPSK, and QAM systems: CPFSK systems, with a fixed number of modulation levels, allow us to obtain decreasing values of Poutat the cost of increasing transmission power by suitably varying the set of signal parameters, even in the absence of diversity techniques and/or adaptive equalization.

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