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Joint Power and Subcarrier Allocation Optimization for Multigroup Multicast Systems With Rate Splitting | IEEE Journals & Magazine | IEEE Xplore

Joint Power and Subcarrier Allocation Optimization for Multigroup Multicast Systems With Rate Splitting


Abstract:

In this article, we investigate a resource allocation problem for multicarrier multiuser MISO (multiple-input-Single-output) downlink systems, where multiple co-channel m...Show More

Abstract:

In this article, we investigate a resource allocation problem for multicarrier multiuser MISO (multiple-input-Single-output) downlink systems, where multiple co-channel multicast groups are served simultaneously. We consider a rate-splitting transmission scheme to address the inevitable inter-group interference under an overloaded multigroup multicast scenario, where the insufficient number of transmit antennas prevents the conventional schemes from neutralizing the interference. We first formulate an optimization problem for maximizing the minimum multicast group rate among all groups on all available subcarriers. This problem involves a joint power and subcarrier allocation optimization, and is non-convex. We apply an iterative scheme based on successive convex approximation (SCA) to find the locally optimal solution. Simulation results demonstrate the performance gain of the proposed scheme compared to the state-of-the-art transmission schemes.
Published in: IEEE Transactions on Vehicular Technology ( Volume: 69, Issue: 2, February 2020)
Page(s): 2306 - 2310
Date of Publication: 06 December 2019

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