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Pilot-Based TI-ADC Mismatch Error Calibration for IR-UWB Receivers

Abstract : In this work, we first provide an overview of the state of the art in mismatch error estimation and correction for time-interleaved analog to digital converters (TI-ADCs). Then, we present a novel pilot-based on-line adaptive timing mismatch error estimation approach for TI-ADCs in the context of an impulse radio ultra wideband (IR-UWB) receiver with correlation-based detection. We introduce the developed method and derive the expressions for both additive white Gaussian noise (AWGN) and Rayleigh multipath fading (RMPF) channels. We also derive a lower bound on the required ADC resolution to attain a certain estimation precision. Simulations show the effectiveness of the technique when combined with an adequate compensator. We analyze the estimation error behavior as a function of signal to noise ratio (SNR) and investigate the ADC performance before and after compensation. While all mismatches combined cause the effective number of bits (ENOB) to drop to 3 bits and to 6 bits when considering only timing mismatch, estimation and correction of these errors with the proposed technique can restore a close to ideal behavior. We also show the performance loss at the receiver in terms of bit error rate (BER) and how compensation is able to significantly improve performance.
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Submitted on : Thursday, September 19, 2019 - 4:35:28 PM
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Christian A. Schmidt, Jose L. Figueroa, Juan E. Cousseau, Andrea M. Tonello. Pilot-Based TI-ADC Mismatch Error Calibration for IR-UWB Receivers. IEEE Access, IEEE, 2019, 7, pp.74340-74350. ⟨10.1109/ACCESS.2019.2921091⟩. ⟨hal-02277947⟩



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