Clock phase adjustment circuit in a RAKE receiver for spread spectrum signals

Abstract

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 analogue complex baseband input signal which is fed via a digital to analogue converter into a complex shift register, each stage of which is connected to each Rake finger and is selectable by each Rake finger.

Inventors

• 👤 Anthony Peter Hulbert
• 👤 Alfred Michael Krumpe

Bibliographic Details