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In carrier-aggregation systems, digital baseband cancelation ofself-interference generated by receiver nonlinearity requires the estimation ofseveral reference signals contributions. As the nonlinearity order andfrequency selectivity of the chip response increase, the number of referencesignals significantly increases rendering the estimation of their contributionsmore complex. We propose a sparsity-based approach for the selection of thereference signals to match the distortion interference using a few referencesignals. Simulation results show significant performance improvement over priorart with the same complexity.

Sparse Digital Cancellation of Receiver Nonlinear Distortion in Carrier Aggregation Systems