Patent ID: 8594575

Claim:
A system for minimizing co-channel interference comprising: a television broadcast system, for transmitting data only to a subscribing plurality of receivers over a plurality of signals, each of the plurality of signals directly associated with a respective one of a plurality of co-channels defined at least in part by a frequency band allocated to each respective co-channel; wherein the plurality of signals comprises: a first signal having a first frame of a first plurality of frames on a first co-channel of the plurality of co-channels, the first signal transmitted at a first time; and a second signal having a second frame of a second plurality of frames on a second co-channel of the plurality of co-channels, the second signal transmitted at a second time equal to the first time, wherein the television broadcast system comprises: an encoder; a scrambler, coupled to the encoder; and a modulator, coupled to the scrambler; wherein the television broadcast system shifts a characteristic of the first signal with respect to a like characteristic of the second signal, wherein the shift is selected to mitigate co-channel interference between the first signal and the second signal, the characteristic comprising at least one of: a transmission code schema of the first signal, wherein at least a portion of at least one of the first plurality of frames of the first signal are transmitted using a first transmission code schema and at least another portion of at least another one of the first plural of frames of the second signal are transmitted using a second transmission code schema different than the first transmission code schema; and an in-phase (I) portion of the first signal and a quaternary (Q) portion of the first signal, wherein the first signal comprises an in-phase (I) first signal portion and a quaternary (Q) phase first signal portion, the second signal comprises an in-phase (I) second signal portion and a quaternary (Q) phase second signal portion, and the television broadcast system swaps the first signal in-phase (I) portion and the second signal quaternary (Q) first signal portion before transmission.