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On Feedforward Cancellation of Third-Order Nonlinear Distortion in Wideband Receivers
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DOI：10.1109/OJCAS.2026.3677259.png)
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Abstract
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While many techniques have been proposed to improve receiver linearity, feedforward cancellation is especially attractive because it operates at the system level and complements circuit-level linearization, enabling additional performance gains. This paper analyzes the effectiveness of feedforward cancellation in the presence of multiple and/or broadband blockers, as commonly encountered in wireless environments. A Volterra-series receiver model is used to capture both nonlinear behavior and wideband memory effects. The analysis shows that robust suppression of third-order intermodulation distortion requires maintaining an approximately constant ratio between the relevant Volterra kernels of the main and auxiliary paths across frequency. Guided by this result, we present a feedforward cancellation architecture that employs nominally identical main and auxiliary paths to promote consistent kernel ratios. Experimental results validate the analysis and demonstrate that reducing kernel-ratio variations leads to significant improvements in receiver linearity.
Keywords:
Receiver
nonlinear distortion
nonlinear distortion
Volterra
Volterra
dynamic range
dynamic range
equalizer
equalizer
equalizer
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