Patent ID: 6445750
Filing Date: 2002-09-03
Classification: H04J,H04L

Abstract:
Apparatus for providing a plurality of digitally modulated signals containing information in a frequency and including an amplitude modulation (AM) carrier frequency, the apparatus comprising:a generator for generating the digitally modulated signals based on at least one power profile, the at least one power profile defining relative power levels of the digitally modulated signals and being configured to reduce adjacent channel interference between the digitally modulated signals and an additional signal set associated with another carrier frequency, the digitally modulated signals populating the frequency band, power levels of a first subset of the digitally modulated signals populating a first subband in the frequency band being non-zero and relatively low, with respect to power levels of a second subset of the digitally modulated signals populating a second subband in the frequency band, the at least one power profile being identified by control information utilizable in a receiver to dynamically adapt the receiver to the at least one power profile in detecting at least a portion of the digitally modulated signals; and an interface for transmitting the digitally modulated signals.