Non-orthogonal unicast and broadcast transmission via joint beamforming and LDM in cellular networks

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Title: Non-orthogonal unicast and broadcast transmission via joint beamforming and LDM in cellular networks
Authors: Zhao, J
Gunduz, D
Item Type: Conference Paper
Abstract: Research efforts to incorporate multicast and broadcast transmission into the cellular network architecture are gaining momentum, particularly for multimedia streaming applications. Layered division multiplexing (LDM), a form of nonorthogonal multiple access (NOMA), can potentially improve unicast throughput and broadcast coverage with respect to traditional orthogonal frequency division multiplexing (FDM) or time division multiplexing (TDM), by simultaneously using the same frequency and time resources for multiple unicast or broadcast transmissions. In this paper, the performance of LDM-based unicast and broadcast transmission in a cellular network is studied by assuming a single frequency network (SFN) operation for the broadcast layer, while allowing for arbitrarily clustered cooperation for the transmission of unicast data streams. Beamforming and power allocation between unicast and broadcast layers, and hence the so-called injection level in the LDM literature, are optimized with the aim of minimizing the sum-power under constraints on the user-specific unicast rates and on the common broadcast rate. The problem is tackled by means of successive convex approximation (SCA) techniques, as well as through the calculation of performance upper bounds by means of semidefinite relaxation (SDR). Numerical results are provided to compare the orthogonal and non-orthogonal multiplexing of broadcast and unicast traffic.
Issue Date: 6-Feb-2017
Date of Acceptance: 2-Jul-2016
Journal / Book Title: Global Communications Conference (GLOBECOM), 2016 IEEE
Copyright Statement: © 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Sponsor/Funder: Commission of the European Communities
Funder's Grant Number: 690893
Conference Name: Global Communications Conference (GLOBECOM), 2016 IEEE
Publication Status: Published
Start Date: 2016-12-04
Finish Date: 2016-12-08
Conference Place: Washington D.C., USA
Appears in Collections:Faculty of Engineering
Electrical and Electronic Engineering

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