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Capacity Improvement in Wideband Reconfigurable Intelligent Surface-Aided Cell-Free Network

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Document pages: 5 pages

Abstract: Thanks to the strong ability against the inter-cell interference, cell-freenetwork has been considered as a promising technique to improve the networkcapacity of future wireless systems. However, for further capacity enhancement,it requires to deploy more base stations (BSs) with high cost and powerconsumption. To address the issue, inspired by the recently proposed techniquecalled reconfigurable intelligent surface (RIS), we propose the concept ofRIS-aided cell-free network to improve the network capacity with low cost andpower consumption. Then, for the proposed RIS-aided cell-free network in thetypical wideband scenario, we formulate the joint precoding design problem atthe BSs and RISs to maximize the network capacity. Due to the non-convexity andhigh complexity of the formulated problem, we develop an alternatingoptimization algorithm to solve this challenging problem. Note that most of theconsidered scenarios in existing works are special cases of the generalscenario in this paper, and the proposed joint precoding framework can alsoserve as a general solution to maximize the capacity in most of existingRIS-aided scenarios. Finally, simulation results verify that, compared with theconventional cell-free network, the network capacity of the proposed scheme canbe improved significantly.

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