A BEAMFORMED ALAMOUTI AMPLIFY-AND-FORWARD SCHEME IN MULTI GROUP MULTICAST CLOUD-RELAY NETWORKS
Refereed conference paper presented and published in conference proceedings


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AbstractIn this paper, we consider a cloud relay network (C-RN) which provides reliable communication between long-distance users. Specifically, we study the amplify-and-forward (AF) schemes in C-RNs. In our scenario setting, with the cloud processor units fully coordinating in the network, the C-RN can be treated as an MIMO relay system. We therefore propose the beamformed (BF) Alamouti AF scheme to provide multi group multicast information delivery in this network. By applying an Alamouti space-time code structure, the relays adopt two rank-one weights to AF the received signals in two time slots. Then, one more degree of freedom is available compared to the traditional BF AF scheme, and a new fractional semidefinite relaxation (SDR) is obtained from a max-min-fair quality-of-service (QoS) perspective. We prove that the Gaussian randomization algorithm based on the new fractional SDR has the same approximation quality-i.e., on the order of VM-as the traditional rank-two SDR approximation in multigroup multicast networks without relays, where M is the number of users served in the network. This result is verified by our numerical experiments.
All Author(s) ListWu SXX, So AMC, Ma WK
Name of Conference40th IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)
Start Date of Conference19/04/2014
End Date of Conference24/04/2014
Place of ConferenceBrisbane
Country/Region of ConferenceAustralia
Detailed descriptionorganized by IEEE,
Year2015
Month1
Day1
PublisherIEEE
Pages3088 - 3092
eISBN978-1-4673-6997-8
ISSN1520-6149
LanguagesEnglish-United Kingdom
Keywordsamplify-and-forward (AF); Cloud relay network (C-RN); multigroup multicast; rank approximation; SDR
Web of Science Subject CategoriesAcoustics; Engineering; Engineering, Electrical & Electronic

Last updated on 2020-30-05 at 00:01