Intellectual Property India Publishes Patent Application for A System And Method For Sparse Delay-Domain Assisted Estimation And Compensation Of Receiver In- Phase And Quadrature Imbalance (iqi) In High-Mobility Otfs Communication Systems

MUMBAI, India, Oct. 12 -- Intellectual Property India has published a patent application (202641119738 A) filed by National Institute Of Technology Calicut on October 06, 2026, for A System And Method For Sparse Delay-Domain Assisted Estimation And Compensation Of Receiver In- Phase And Quadrature Imbalance (iqi) In High-Mobility Otfs Communication Systems.

Inventors include Shyama Sreekumar; Dr. Sameer S. M; and Dr. Rakesh R. T..

The application for the patent was published on October 09, 2026, under issue no. 41/2026.

Abstract: A method (400) for estimation and compensation of receiver in-phase and quadrature imbalance (IQI) in a multiple-input multiple-output orthogonal time frequency space (MIMO-OTFS) communication system (200) includes receiving, at one or more receive antennas (208), a time-domain OTFS signal affected by receiver IQI, where the receiver IQI includes at least one of amplitude imbalance or phase imbalance. The method (400) includes reshaping the time-domain OTFS signal into a matrix having delay rows and Doppler columns, and identifying a set of active delay taps by computing energy per delay row, estimating a noise floor from a lowest percentile of the row energies, and selecting delay rows where the energy exceeds a predetermined multiple of the noise floor. The method (400) includes extracting (304) statistical parameters exclusively from samples corresponding to the identified active delay taps directly in the time domain without requiring a symplectic finite Fourier transform or inverse symplectic finite Fourier transform, where the statistical parameters include at least second-order statistical parameters. The method (400) includes estimating (306) IQI parameters based solely on the extracted second-order statistical parameters without executing a separate channel estimation process and without employing pilot symbols or training sequences, and compensating (308) the time-domain OTFS signal using the estimated IQI parameters prior to OTFS demodulation (310) such that image interference effects are mitigated. (FIG. 4)

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