ΣΔ interference canceling ADC´s for antenna arrays

This paper examines a beamforming approach towards reducing the power consumption in oversampling sigma delta (SigmaDelta) 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 SigmaDelta 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 SigmaDelta modulators results in reducing interferer power up to a factor of four for a scenario with 2 users and 4 antennas.