Degrees of Freedom in Wireless Interference Networks With Cooperative Transmission and Backhaul Load Constraints
作者： Meghana Bande , Aly El Gamal , Venugopal V. Veeravalli
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摘要: Degrees of freedom (DoFs) gains are studied in wireless networks with cooperative transmission under a backhaul load constraint that limits the average number messages can be delivered from centralized controller to base station transmitters. The is defined as sum all available at transmitters per channel use, normalized by users. For Wyner’s linear interference network, where each transmitter connected receiver having same index well one succeeding receiver, user DoF characterized and optimal scheme presented. Furthermore, it shown assignment asymmetric satisfies local cooperation coding relies only on one-shot zero-forcing transmit beamforming. Using insights analysis results extended more practical hexagonal sectored cellular schemes based deliver significant gains. It established allowing for flexible message constrained an load, rate promised information-theoretic upper bounds incur little or no additional backhaul. Finally, useful presented lower values constraint, optimization framework formulated general converse problem.
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