Cambridge Silicon Radio Limited

Candido Levita

James Digby Collier

Timothy John Newton

Apparatus for locating a specific point in a received signal of cyclical nature, the apparatus comprising correlating means () for correlating the received signal with a code that is potentially present in the received signal, processing means () for multiplying the correlation result with a time-offset, complex-conjugated version of itself and filtering means () for low pass filtering the multiplication result to produce a signal suited to analysis for determination of said point and estimation of the frequency error.

Synchronising a receiver to a signal having known structure

A method for estimating the distance between a transmitter and a receiver, the transmitter being arranged to transmit a signal as a series of bursts, and the carrier frequency of each burst being set according to a predetermined sequence, the method comprising: forming a first series comprising the measured differences between the phases of successive bursts as received at the receiver; forming a second series comprising estimated differences between the phases of successive bursts as received at a supposed time difference between the transmitter and the receiver; and determining the quality of fit between the first series and the second series.

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Cambridge, United Kingdom

Candido Levita