Intermodulation suppression in phased arrays using volterra filters

A beamforming system, comprising:

• a processor configured to generate a single non-linear equalization (NLEQ) coefficient set in beamspace, the single NLEQ coefficient set configured to characterize non-linear behavior of a system having an array of N elements;
• a receiver configured to receive M parallel digital signals for transmission by N channels, respectively, the N channels corresponding to the N elements;
• an equalizer configured for equalizing each of the M respective parallel digital signals, using an NLEQ filter based on the single NLEQ coefficient set, wherein the single NLEQ coefficient set is used for each of the N elements and wherein the equalizing is configured to generate a set of M linearized parallel digital signals;
• and
• a summer configured to add together the M linearized parallel digital signals, to produce one or more beamspace channelized output signals.

A non-linear equalization system, comprising:

• a processor configured to generate a single non-linear equalization (NLEQ) coefficient set configured to characterize non-linear behavior of a system having N channels;
• an equalizer configured for equalizing each of the N respective parallel digital signals that are received at the N channels, using an NLEQ filter based on the single NLEQ coefficient set, wherein the single NLEQ coefficient set is used for each of the N channels, and wherein the equalizing is configured to generate a set of N linearized parallel digital signals;
• and
• a summer configured to add together the set of N linearized parallel digital signals.