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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摘要In 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.
著者Wu SXX, So AMC, Ma WK
會議名稱40th IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)
會議開始日19.04.2014
會議完結日24.04.2014
會議地點Brisbane
會議國家/地區澳大利亞
詳細描述organized by IEEE,
出版年份2015
月份1
日期1
出版社IEEE
頁次3088 - 3092
電子國際標準書號978-1-4673-6997-8
國際標準期刊號1520-6149
語言英式英語
關鍵詞amplify-and-forward (AF); Cloud relay network (C-RN); multigroup multicast; rank approximation; SDR
Web of Science 學科類別Acoustics; Engineering; Engineering, Electrical & Electronic

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