Abstract
Error rate performance of Gaussian minimum shift keying (GMSK) signals with centre sampling single and double differential detection (CSDD, CSDDD) is analyzed in restricted bandwidth (BW) fast Rayleigh channel. The performance of CSDD and CSDDD schemes is analyzed in the presence of carrier random frequency shift, Doppler frequency shift, co-channel interference (CCI), and additive white Gaussian noise (AWGN), while the receiver rejects a specified amount of adjacent channel interference (ACI). For the interference, we adopt a model which includes N statistically independent faded CCI. A formula for the error floor is also presented. It is shown that the CSDD scheme is sensitive to frequency offset and in many instances can not be used at all. However, the CSDDD scheme has a potential to combat the effect of frequency shifts and its performance is better than the CSDD scheme with about 2.6 dB when random frequency shifts are introduced into the carrier. Furthermore, the performance of these schemes is improved by utilizing the conventional decision feedback (CDF) technique.
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