Selection diversity system using decision feedback equalizer in digital mobile telecommunication systems

Claim 1

A selection diversity system using a decision feedback equalizer comprising: a plurality of antennas; a plurality of receivers respectively connected to the antennas to obtain respective baseband signals as outputs of the receivers; a plurality of decision feedback type equalizers receptive of said respective baseband signals liar equalizing intersymbol interference in said respective baseband signals resulting from frequency selective fading to obtain respective decision outputs, respective equalized outputs and respective estimation errors; a plurality of equalization error average value detectors receptive of said receptive estimation errors liar calculating respective average values of the respective estimation errors during a predetermined number of symbols including equalization points; a comparator receptive of the respective average values of the respective estimation errors for providing selection information indicative of a smallest one of the respective average values of the respective estimation errors; a selector receptive of the selection information for selecting, in accordance with the selection information, one of said decision outputs of the plurality of decision feedback type equalizers to obtain a selected decision output; and a plurality of estimation error recalculators receptive of the selected decision output from the selector and the respective equalized outputs from said decision feedback type equalizers to obtain respective recalculated estimation errors, which are fed back to the decision feedback type equalizers to update respective tap gain coefficients of said decision feedback type equalizers.