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In this paper, we propose a fully-integrated radar and communication system-- named ComSens. We utilize two different pilot sequences (one for uplink andone for downlink) with the condition that they must be uncorrelated to eachother. Within such a framework, the signal received from end-user and theback-scattered signal from the desired objects have uncorrelated pilots. Thus,the base-station is able to distinguish data signal from user andback-scattered signal from object. We assume a time division duplex (TDD)framework. The pilot sequences are designed for MIMO channels. We evaluatechannel MSE as a figure of merit for communication system. We also show thatthe designed pilots are uncorrelated for a range of time lags. Moreover,designed uplink pilot has negligible autocorrelation for a range of time lagsleading to an impulse-like autocorrelation for radar sensing.

ComSens: Exploiting Pilot Diversity for Pervasive Integration of Communication and Sensing in MIMO-TDD-Frameworks