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Abstract

A diversity combiner for a digital receiver receives a plurality of complex baseband signals (S.sub.1 (t), S.sub.2 (t)) each having an associated receive signal strength-intensity signal (RSSI.sub.1, RSSI.sub.2). The combiner differentially detects each of the complex baseband signals (S.sub.1 (t), S.sub.2 (t)) to produce a plurality of differential signals (RX.sub.1 (t), RX.sub.2 (t)) in accordance with: RX.sub.1 (t)=S.sub.1 (t).multidot.S.sub.1 *(t-T), and RX.sub.2 (t)=S.sub.2 (t).multidot.S.sub.2 *(t-T) where S.sub.x * is the complex conjugate of S.sub.x and T is a symbol delay. The differential signals (RX.sub.1 (t), RX.sub.2 (t) ) are processed to produce a selected differential signal R(t). The selected differential signal R(t) is converted to produce a plurality of converted signals D.sub.1 (t) and D.sub.2 (t) in accordance with: D.sub.1 (t)=R(t).multidot.e.sup.-j2.pi.fst D.sub.2 (t)=R(t).multidot.e.sup.+j2.pi.fst The converted signals D.sub.1 (t) and D.sub.2 (t) are further processed to produce timing (.tau.) and frequency (f.sub.e) error estimates by: ##EQU1## where C.sub.1 (t) and C.sub.-1 (t) are the averages of D.sub.1 (t) and D.sub.2 (t) respectively.

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First Claim