Supervised phase correction of blind space-time DS/CDMA channel estimatesSupervised phase correction of blind space-time DS/CDMA channel estimates Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2015-10-232007enBlind channel-estimation algorithms return phase-ambiguous estimates. From a receiver design point of view, the phase-ambiguity problem can be by-passed by differential modulation and detection at the expense of a well-known performance loss, in comparison with direct modulation and coherent detection schemes. An alternative approach is followed in this paper. A theoretical minimum mean-square error phase-estimation criterion leads to a supervised phase-recovery procedure that directly corrects the phase of arbitrary linear filter receivers through a simple closed-form projection operation. Conveniently, any known blind channel-estimation algorithm can be used to provide the initial phase-ambiguous estimate. The presentation is given in the context of adaptive space-time receiver designs for binary phase-shift keying direct-sequence code-division-multiple-access antenna array systems. Numerical and simulation studies support the theoretical developments and show that effective phase correction and multiple-access interference suppression can be achieved with about 2% pilot signalingΔημοσίευση σε επιστημονικό περιοδικό http://creativecommons.org/licenses/by/4.0/IEEE Transactions on Communications355584 - 592 Karystinos Georgios Καρυστινος Γεωργιος Pados, D.A. Institute of Electrical and Electronics Engineers Adaptive arrays antenna arrays code-division multiple access (CDMA) communication channels differential phase-shift keying (DPSK) mean-square error (MSE) methods phase estimation