Synchronization apparatus for a diversity receiver
US5461646A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 25, 1995 |
| Grant date | Oct 24, 1995 |
| Priority date | — |
| Expiry date | Apr 25, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B17/318
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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: EQU RX.sub.1 (t)=S.sub.1 (t).multidot.S.sub.1 *(t-T), and EQU 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: EQU D.sub.1 (t)=R(t).multidot.e.sup.-j2.pi.fst EQU 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.