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Communication systems which work in excess of, but close to, the channel's coherent bandwidth are expected to have a small number of significant components in their channel's impulse response which causes inter-symbol interference (ISI). Also, for a packet based system, if the channel presents variations during packet transmission, the system can be driven to a high error floor reducing data throughput. The proposed solution uses an optimised maximum likelihood sequence estimator (MLSE) equaliser in conjunction with a space-time block code (STBC) multiple antenna system that works under all the mentioned factors without a considerable increase in complexity but with a high level of flexibility. The optimised MLSE equaliser showed a considerable increment in data throughput for the system under test when using the differential phase shift keying modulation schemes π/2 DBPSK, π/4 DQPSK and 8-DPSK. It is proposed that this approach be adopted for short range, ad hoc, wireless personal area networks (WPAN).