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ΣΔ interference canceling ADC's for antenna arrays

This paper examines a beamforming approach towards reducing the power consumption in oversampling sigma delta (ΣΔ) analog to digital converters (ADC's) for multiuser antenna array communication systems. We propose a setup where the output of the ADC's are fed-back to the input of a ΣΔ modulator through a beamformer to cancel the contributions of interfering signals. We examine the feasibility of such ADC's and propose algorithms to estimate the beamformer and cancel the interfering users. Simulation results show that introducing such algorithms inside the ΣΔ modulators results in reducing interferer power up to a factor of four for a scenario with 2 users and 4 antennas.