Roke Manor Research Limited

David Peter Chandler

Anthony Peter Hulbert

A direct sequence spread spectrum receiver includes correlators for handling prompt, late and early signals. An estimator is used to provide an estimate of the prompt signal and this used in a multiplication process with the late and early signals. The resultant signals are further processed to generate control signals.

Apparatus for code tracking in a direct sequence spread spectrum receiver

Apparatus for acquiring code phase lock in direct sequence spread

Apparatus for use in equipment providing a digital radio link between a

The apparatus includes circuitry for determining which base station a mobile unit should be affiliated to for best reception, and circuitry for maintaining affiliation with the base station to which the mobile is currently connected. Cancellation circuitry is provided for cancelling the interference caused as a result of the mobile unit being affiliated to the base station giving non-optimum reception.

Interference cancellation apparatus for mitigating the effects of poor

An automatic power control system for a cellular mobile radio system, comprising: a control center via which a plurality of base stations, each serving a cell, are linked to facilitate mutual communication between mobile units which gain access to the cellular mobile radio system via the base stations; at least two mobile units distinguishable by identification codes, the mobile units being arranged to transmit, in addition to an identification code unique to each mobile unit, a data sequence common to each mobile unit, but transmitted by each mobile unit at a nominally different time within each burst; each of said the stations including correlator operative to discriminate between signals from mobile units within its own cell and interfering signals from mobile units in adjacent cells and a data logger; and a data processing unit located at the control center and arranged to merge data from the data loggers located at each of the base stations, which serves to store the results of correlation of the data sequence common to each mobile unit, so that details of relative power levels and times of reception are recorded as these details relate to signals received, the control center including a signal processor responsive to the data logger at each base station for identifying mobile units involved in potentially mutually interfering situations and feeding back instructions as appropriate to each of the base stations whereby power control signals are transmitted to these mobile units over the radio link from the base stations.

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Romsey, United Kingdom

David Peter Chandler