Her Majesty the Queen in Right of Canada As Represented by the Minister of Industry Through the Communications Research Centre Canada

Her Majesty the Queen in Right of Canada, As Represented by the Minister of Industry, Through Communications Research Centre Canada

Her Majesty the Queen in Right of Canada, As Represented by the Minister

Her Majesty the Queen in Right of Canada, Represented by the Minister of Industry, Via Communications Research Centre Canada

Xinping Huang

Mario Caron

Zhiwen Zhu

The invention relates to a method and circuit for linearizing amplifiers and other nonlinear circuits for multi-carrier signals. An output signal from the amplifier is sampled, and a correlation matrix of size N&#xd7;N is computed from the sampled signal, wherein N exceeds the number of multiplexed carriers in the signal. A signal-to-distortion ratio (SDR) is then estimated based on a ratio of one or more largest to one or more smallest eigenvalues of the correlation matrix, and the signal into the amplifier is pre-distorted so as to maximize the SDR.

Multi-carrier amplifier linearization system and method

The invention provides a type-based method to compensate for distortions in circuits operating on a plurality of input modulated signals to form one or more output modulated signals. Steps of the method include low-rate sampling of the output signal to obtain a statistical characteristics thereof, and adjusting parameters of the circuit to introduce a controlled degree of cross-coupling between the signals until the statistical characteristics of the output signal approximates a reference characteristics defined by the used modulation formats. Another aspect of the invention provides a self-calibrating multi-port circuit implementing the method.

Self-calibrating multi-port circuit and method

The invention relates to methods and circuits for compensating linear in-band distortions such as those occurring in RF circuits of broad band communication systems. A low-rate sampling is used to collect statistical information about a modulated signal after it passed through the distorting circuits, which is then compared to reference statistical information for the modulated signal to iteratively adjust a frequency response of an equalizing linear filter inserted into the signal path so as to compensate for the distortions.

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Xinping Huang