Northern Telecom Limited

Belair Networks Inc.

David William Park

Stephen G Rayment

Kevin Bailey

Stuart James Dean

Bernard Herscovich

Michael Brown

Geoffrey B Brown

William Justin Mayda

Outdoor wireless product enclosure for elevated mounting

A dual mode transceiver architecture suitable for adaptation in either a handset or a base station and capable of operating in both Frequency Division Duplex (FDD) mode or in Time Division Duplexing (TDD) mode is disclosed. Such a transceiver has an up conversion path capable of up converting an Intermediate Frequency (IF) to a Radio Frequency (RF) signal in either an upper band frequency range or a lower band frequency range. Also the transceiver has a down conversion path, used for receiving, for down converting a RF signal in either the upper band or lower band to a desirable IF frequency. The transceiver includes a switch array capable of switching the up conversion path to either the upper band port or the lower band port of a diplexer and the switch array also switches the upper band port and lower band port of the diplexer to the down conversion path depending on whether the transceiver is operating in TDD mode or FDD mode. Also, if in TDD mode, the switch array determines whether the transceiver is transmitting or receiving.

Dual mode transceiver

A method of demodulating an oversampled digitised analogue signal F(t) wherein n samples per bit of the digitised signal represent the instantaneous frequency and/or phase of the signal. The method includes the steps of selecting a sequence of bits containing bit value transitions, determining the magnitude of F(t) within the sequence so that all the extrema are maxima (or minima), whereby the maxima (or minima) of .vertline.F(t).vertline. provide a defined timing position in relation to the bits of the sequence. The value of .vertline.F(t).vertline. over a succession of said bits is averaged and a timing control signal is derived therefrom for demodulation of the digitised analogue signal.

Timing recovery for digital demodulation

Growing community of inventors

Kanata, Canada

David William Park