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US 2002/0164949 A1Published application
Satellite communication apparatus
AssigneeTandberg Television ASA
InventorsBrian Herbert Beech, David G. Edwards, Ravin Perinpanayagam
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AssigneeTandberg Television ASA
InventorsBrian Herbert Beech, David G. Edwards, Ravin Perinpanayagam
Estimating the term…
A satellite communication apparatus has a corrector for reducing distortion of a signal in a communication channel. The corrector is formed by a forward model representative of a pre-calculated estimate of non-linearity and group delay of the satellite transmission/reception channel from the input to the up sampler through to the output of the down sampler. The forward model may also comprise a model of magnitude response of a satellite input multiplexer filter and output multiplexer filter. Cascaded identical stages of the corrector may be provided so that distortion in the channel is successively reduced towards zero by each successive stage. An initial approximator which is substantially the inverse of the distorting function of the forward model may be provided.
A satellite communication apparatus including corrector means for reducing distortion of a signal in a satellite communication channel, said corrector means comprising a forward model providing pre-correction required for counteracting distortion of said signal in said channel, said forward model being a pre-calculated estimate of non-linearity and group delay in said channel.
A method for reducing distortion of a signal in a satellite communication channel including the step of modelling distortion of said signal in said channel caused by non-linearity and group delay and providing said model as a forward model in a corrector for counteracting said distortion.
A satellite communication apparatus including corrector means for reducing distortion of a signal in a satellite communication channel, said corrector means comprising a forward model providing pre-correction required for counteracting distortion of said signal in said channel, said forward model being a pre-calculated estimate of non-linearity and group delay in said channel comprising a series connection of an up-sampler, and a model representative of magnitude and phase of:
A satellite communication apparatus including corrector means for reducing distortion of a signal in a satellite communication channel, said corrector means comprising a forward model providing pre-correction required for counteracting distortion of said signal in said channel, said forward model being a pre-calculated estimate of non-linearity and group delay in said channel comprising a series connection of an up-sampler, a model representative of magnitude and phase of:
A method for reducing distortion of a signal in a satellite communication channel including the step of modelling distortion of said signal in said channel caused by non-linearity and group delay and providing said model as a forward model in a corrector for counteracting said distortion, and wherein said forward model comprises a series connection of an up-sampler;
A method for reducing distortion of a signal in a satellite communication channel including the step of modelling distortion of said signal in said channel caused by non-linearity and group delay and providing said model as a forward model in a corrector for counteracting said distortion, and wherein said forward model comprises a series connection of an up-sampler;
Dependencies are inferred from the claim text.