US 2008/0187038 A1 · Asymmetric multi-channel adaptive equalizer

Abstract

An apparatus is disclosed to compensate for non-linear effects resulting from the transmitter, the receiver, and/or the communication channel in a communication system. A receiver of the communication system contains an image cancellation module that compensates for images generated during the modulation and/or demodulation process. The image cancellation module includes a fine carrier correction loop to correct for frequency offsets between the transmitter and receiver. The image cancellation module includes a coarse acquisition mode and a decision directed mode. The decision directed mode allows for a larger signal-to-noise ratio for the receiver when compared against the coarse acquisition mode.

Claims20

Dependent claims

An adaptive image canceler comprising:

a feed forward equalizer (FFE) configured to receive a multi-channel communication signal including a first information channel, the first information channel including a first signal of interest and a residual signal;
an image canceler module configured receive a reference residual signal, wherein the image canceler module operates upon the reference residual signal to produce an output that is a substantially close replica of the residual signal;
and
a summer to combine an output of the FFE with the output of the image canceler module, wherein the FFE and the image canceller module are both adjusted based upon an output of the summer module.

1 more element

Dependencies are inferred from the claim text.

Asymmetric multi-channel adaptive equalizer

Life of this patent

Asymmetric multi-channel adaptive equalizer

Life of this patent

Abstract

Claims20