Method and apparatus for error compensation in a hybrid matrix amplification system

A multi-channel transmitter comprising:

• an input signal forward path having a plurality of input ports and a plurality of output ports, the input signal forward path further comprising:
• an input fourier transform matrix (FTM) having a plurality of input ports and a plurality of output ports that receives a predetermined signal at an input port of the plurality of input ports and routes at least a portion of the predetermined signal to each output port of the plurality of output ports to produce a plurality of input FTM output signals;
• a signal processing section having plurality of input ports and a plurality of output ports, wherein each input port of the plurality of input ports of the signal processing section receives an input FTM output signal of the plurality of input FTM output signals and wherein the signal processing section amplifies each received input FTM output signal to produce an amplified signal and routes each amplified signal to an output port of the plurality of signal processing section output ports;
• an output FTM having a plurality of input ports and a plurality of output ports, wherein each input port of the plurality of input ports of the output FTM receives an amplified signal from an output port of the plurality of output ports of the signal processing section, and wherein the output FTM produces a forward path output signal at an output port of the plurality of output ports based on the plurality of received amplified signals;
• and
• an outer loop feedback circuit coupled to the input signal forward path that receives at least a portion of the forward path output signal, determines an outer loop error based on the at least a portion of the forward path output signal, produces an outer loop control signal based on the determined outer loop error, and wherein the input signal forward path adjusts at least one of a gain and a phase of a signal coupled to the input signal forward path based on the outer loop control signal.

A method of error compensation in a hybrid matrix amplification system comprising steps of:

• coupling a predetermined signal to a first Fourier Transform Matrix (FTM) to produce a plurality of first FTM output signals;
• processing each first FTM output signal of the plurality of first FTM output signals to produce a plurality of amplified signals;
• coupling each amplified signal of the plurality of amplified signals to an input port of a plurality of input ports of a second FTM, wherein the second FTM produces a second FTM output signal based on the plurality of amplified signals;
• determining a loop error based on the second FTM output signal;
• and
• producing a control signal based on the determined loop error, wherein the control signal is operable to adjust at least one of a gain and a phase of a signal coupled to the hybrid matrix amplification system.