System and method for radio frequency carrier aggregation

An apparatus for controlling a combined waveform, representing a combination of at least two signals, each having a plurality of signal components and conveying information, comprising:

• an input port configured to receive information defining the at least two signals;
• an automated processor configured to:
• transform a first of the signals into at least two representations of the conveyed information within a range of transformations, along with pilot signal information which varies in frequency and which is selectively communicated over time, to permit a receiver to estimate a channel state, having prohibited combinations of transformation parameters and pilot signal information,
• combine a transformed representation of a first of the signals with a second of the signals, to define at least two alternate combinations representing the conveyed information, and
• select one combination which meets a predetermined criterion and which permits the receiver to at least estimate the channel state;
• and
• an output port configured to output information representing a respective combined waveform comprising the selected one combination of the transformed representation which meets the predetermined criterion.

A system for controlling a combined waveform, representing a combination of at least one multiple subchannel multiplexed signal according to a predetermined protocol to be communicated from a transmitter to a receiver with a modulated signal, the multiple subchannel multiplexed signal comprising pilot signals, within at least one subchannel for at least a portion of time, having predefined characteristics sufficiently independent of information to be communicated, to permit receiver prediction of a communication channel state with respect to varying communication channel conditions, comprising:

• a model of a receiver stored in a memory, dependent on a combination of the multiple subchannel multiplexed signal with the modulated signal in a memory, for predicting a receiver ability to demodulate information and a receiver ability to predict the channel state, over a range of at least one parameter representing an alteration in the state of the combination;
• and
• an automated processor configured to define the combination of the multiple subchannel multiplexed signal with the modulated signal which is predicted to permit sufficient receiver estimation of the channel state to demodulate the information and which further meets at least one fitness criterion distinct from the receiver estimation of the channel state and being dependent on both the multiple subchannel multiplexed signal and the modulated signal, with respect to at least two different values for the at least one parameter.