Performance of Superposition Coded Broadcast/Unicast Service Overlay System

Seokhyun YOON  Donghee KIM  

IEICE TRANSACTIONS on Communications   Vol.E91-B   No.9   pp.2933-2939
Publication Date: 2008/09/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.9.2933
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
superposition coding,  OFDM,  service overlay,  

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The system level performance of a superposition coded broadcast/unicast service overlay system is considered. Cellular network for unicast service only is considered as interference limited system, where increasing the transmission power does not help improve the network throughput especially when the frequency reuse factor is close to 1. In such cases, the amount of power that does not contribute to improving the throughput can be considered as "unused." This situation motivates us to use the unused power for broadcast services, which can be efficiently provided in OFDM based single frequency networks as in digital multimedia broadcast systems. In this paper, we investigate the performance of such a broadcast/unicast overlay system in which a single frequency broadcast service is superimposed over a unicast cellular service. Alternative service multiplexing using FDM/TDM is also considered for comparison.