Method and apparatus for combating co-channel NTSC interference for digital TV transmission using a bank of rejection filters

A method for reducing a co-channel interference in a digital television signal transmitted by a transmitter, the transmitted digital television signal having an encoded digital television signal component, a co-channel interference component, and a noise component, wherein a precoder, for which precoding is implemented at the television transmitter, encodes the digital television signal, said method comprising the steps:

• receiving the transmitted digital television signal and providing a received output signal;
• filtering the received output signal to reduce the co-channel interference component thereof, said filtering step comprising using a desired one of a plurality of rejection filters by enabling the desired rejection filter in response to a selection control signal, the enabled rejection filter corresponding to an optimal rejection filter for the precoder for which precoding is implemented at the television transmitter, and providing a filtered output signal;
• detecting information regarding the precoder in response to the received output signal, said detecting step comprising selecting the desired one of the plurality of rejection filters in response to the detected information, and providing the selection control signal;
• and
• producing a decoded digital television signal in response to the filtered output signal.

An HDTV digital communication system for reducing a co-channel interference in a digital television signal, said system comprising:

• a transmitter for transmitting the digital television signal, the transmitted digital television signal having an encoded digital television signal component, a co-channel interference component, and a noise component, said transmitter further having a precoder means for implementing a desired precoding to encode the digital television signal, wherein the precoder means comprises a plurality of precoders, said transmitter further having a selection means for selecting and enabling one of the precoders of the plurality of precoders to facilitate the desired precoding of the digital television signal;
• and
• a television receiver, wherein said receiver comprises means for receiving the transmitted digital television signal, said receiving means further providing a received output signal;
• filter means for filtering the received output signal to reduce the co-channel interference component thereof, said filter means comprising a plurality of rejection filters, and means, responsive to a selection control signal, for selectively enabling a desired one of said plurality of rejection filters, the enabled rejection filter corresponding to an optimal rejection filter for the precoder for which precoding is implemented at said television transmitter, said filter means providing a filtered output signal;
• means, responsive to the received output signal, for detecting information regarding the precoder, said detecting means comprising means for selecting the desired one of the plurality of rejection filters in response to the detected information, said detecting means providing the selection control signal;
• and
• means responsive to filtered output signal for producing a decoded digital television signal.

A method for reducing a co-channel interference in an HDTV digital communication system for reducing a co-channel interference in a digital television signal, said method comprising the steps:

• transmitting the digital television signal, the transmitted digital television signal having an encoded digital television signal component, a co-channel interference component, and a noise component, said step of transmitting further comprising implementing a desired precoding with a precoder means to encode the digital television signal, the precoder means comprising a plurality of precoders, and selecting and enabling one of the precoders of the plurality of precoders to facilitate a desired precoding of the digital television signal;
• receiving the transmitted digital television signal and providing a received output signal;
• filtering the received output signal to reduce the co-channel interference component thereof, said filtering step comprising using a desired one of a plurality of rejection filters by enabling a desired one of said plurality of rejection filters in response to a selection control signal, said enabled rejection filter corresponding to an optimal rejection filter for the enabled precoder for which precoding is implemented in the television transmitter, and providing a filtered output signal;
• detecting information regarding the enabled precoder in response to the received output signal, said detecting step comprising selecting the desired one of the plurality of rejection filters in response to the detected information, and providing the selection control signal;
• and
• producing a decoded digital television signal in response to the filtered output signal.