Apparatus for use in equipment providing a digital radio link be

Details Apparatus for use in equipment providing a digital radio link be Apparatus for use in equipment providing a digital radio link be

1995-09-28

1997-10-07

Bocure, Tesfaldet

Pulse or digital communications

Synchronizers

Synchronizing the sampling time of digital data

375347, H04L 700

Patent

active

056756160

ABSTRACT:
For a Rake receiver in which the received signal is sampled at only one sample per chip, the signal is energy collected from several multipath components by the Rake fingers. If any multipath component is not perfectly aligned with the sampling time, several Rake fingers will be needed to collect its energy. If the number of Rake fingers available is limited, then more efficient collection of energy is possible if fine timing correction is applied to the sampling so that optimum sampling is applied to the strongest multipath component. In this way, only one Rake finger is required and the other Rake fingers may be dedicated to the remaining multipath components. The present invention uses two types of control methods, a Tau dither phase control circuit or a pilot jitter clock circuit. The control circuit generates control signals for the various Rake fingers and also controls a clock phase adjuster which in turn controls a sample and hold circuit which receives the analog complex baseband input signal which is fed via an analog-to-digital converter into a complex shift register, each stage of which is connected to each Rake finger and is selectable by each Rake finger.

REFERENCES:
patent: 4965808 (1990-10-01), Maine
patent: 5077754 (1991-12-01), Namioka
patent: 5361276 (1994-11-01), Subramanian
patent: 5590160 (1996-12-01), Ostman
patent: 5594755 (1997-01-01), Hulbert

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