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In this paper, we analyze the performance of partially coherent BPSK systems in the presence of intersymbol interference. Generalized flat fading channels including Rayleigh, Rician, and Nakagami-m are investigated, and Tikhonov-distributed phase error processes are assumed. We consider diversity system with L-branch signals that being detected using post detection equal-gain combining (EGC) receiver. The diversity branches are assumed to experience slow, flat, and uncorrelated fading. Two performance criteria are considered: the average bit-error probability (BEP) and the signal-to-noise ratio (SNR) gain penalty due to the sampling time jitter. Quazi-analytical simulation results are also presented.