Transmission Capacity of Ad-hoc Networks with Multiple Antennas using Transmit Stream Adaptation and Interference Cancelation - Computer Science > Information TheoryReport as inadecuate




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Abstract: The transmission capacity of an ad-hoc network is the maximum density ofactive transmitters per unit area, given an outage constraint at each receiverfor a fixed rate of transmission. Assuming that the transmitter locations aredistributed as a Poisson point process, this paper derives upper and lowerbounds on the transmission capacity of an ad-hoc network when each node isequipped with multiple antennas. The transmitter either uses eigen multi-modebeamforming or a subset of its antennas to transmit multiple data streams,while the receiver uses partial zero forcing to cancel certain interferersusing some of its spatial receive degrees of freedom SRDOF. The receivereither cancels the nearest interferers or those interferers that maximize thepost-cancelation signal-to-interference ratio. Using the obtained bounds, theoptimal number of data streams to transmit, and the optimal SRDOF to use forinterference cancelation are derived that provide the best scaling of thetransmission capacity with the number of antennas. With beamforming, singledata stream transmission together with using all but one SRDOF for interferencecancelation is optimal, while without beamforming, single data streamtransmission together with using a fraction of the total SRDOF for interferencecancelation is optimal.



Author: Rahul Vaze, Robert W. Heath Jr

Source: https://arxiv.org/



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