Feedback Design for Multi-Antenna K -Tier Heterogeneous Downlink Cellular Networks - 2018


We characterize the ergodic spectral potency of a non-cooperative and a cooperative kind of K -tier heterogeneous network with restricted feedback. Within the non-cooperative case, a multi-antenna base station (BS) serves a single-antenna user using maximum-ratio transmission primarily based on restricted feedback. In the cooperative case, a BS coordination set is made by using dynamic clustering across the tiers, wherein the intra-cluster interference is mitigated by using multi cell zero-forcing additionally based on limited feedback. Modeling the network based on stochastic geometry, we derive analytical expressions for the ergodic spectral potency as a perform of the system parameters. Leveraging the obtained expressions, we formulate feedback partition problems and acquire solutions to enhance the ergodic spectral efficiency. Simulations show the spectral potency improvement by using the obtained feedback partitions. Our major findings are as follows: one) in the non-cooperative case, the feedback is solely useful in a explicit tier if the mean interference is tiny enough; a pair of) in the cooperative case, allocating more feedback to stronger intra-cluster BSs is efficient; and 3) in both cases, the obtained solutions don't modification relying on the instantaneous signal-to-interference ratio.

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