Freescale Semiconductor,inc.

David Bateman

Marc Bernard De Courville

Patrick Labbe

Eric Toussaere

Sebastian Simoens

Jean-Noel Patillon

In an orthogonal frequency division multiplex communication system, for example a HIPERLAN/2 system, power amplifiers () of mobile terminals () are switched off when not in use, and then switched on again when a signal transmission is to be made. This conserves power, but introduces a power amplifier transient (). An access point (), i.e. a type of base station, compensates for these power amplifier transients () using a simple scalar constant gain transient correction, over a full OFDM symbol (or a plurality of OFDM symbols). The correction is updated on an OFDM symbol by symbol basis (or plurality of symbols by plurality of symbols basis).

Controlling power supply between a voltage generator, a load and a rechargeable battery

A detector or a modulator for converting between optical and radio frequency signals comprising an optical guide (to) for propagating two optical signal components having frequencies that differ by an amount corresponding to a radio frequency and a microstrip radio signal guide () for propagating a radio signal at the radio frequency, the microstrip radio signal guide being in travelling-wave coupling with an interaction one () of the optical guide comprising material in which interaction between the optical signal components and the radio signal occur. The microstrip radio signal guide element () comprises an electrically conductive strip () juxtaposed with and extending along the interaction zone () on one side thereof and an electrically conductive ground plane () juxtaposed with and extending along the interaction zone () on an opposite side thereof. Transition radio signal guide elements () in the form of Vivaldi antennas extending transversely to the microstrip () connect the microstrip radio signal guide element () with a rectangular section wave-guide () and a matched load. Each of the transition radio signal guide elements () comprises an opening of progressively varying width formed in the electrically conductive ground plane of the microstrip guide (). Radio frequency signal resonators (to) extend the ends of the microstrip () and the small ends of the Vivaldi antennas.

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Boulogne-Billancourt, France

David Bateman