Robust Uplink Communications over Fading Channels with Variable Backhaul Connectivity
Two mobile users communicate with a central decoder via two base stations. Communication between the mobile users and the base stations takes place over a Gaussian interference channel with constant channel gains or quasi-static fading. Instead, the base stations are connected to the central decoder...
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| Veröffentlicht in: | IEEE transactions on wireless communications Jg. 12; H. 11; S. 5788 - 5799 |
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| Sprache: | Englisch |
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New York, NY
IEEE
01.11.2013
Institute of Electrical and Electronics Engineers The Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
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| ISSN: | 1536-1276, 1558-2248 |
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| Abstract | Two mobile users communicate with a central decoder via two base stations. Communication between the mobile users and the base stations takes place over a Gaussian interference channel with constant channel gains or quasi-static fading. Instead, the base stations are connected to the central decoder through orthogonal finite-capacity links, whose connectivity is subject to random fluctuations. There is only receive-side channel state information, and hence the mobile users are unaware of the channel state and of the backhaul connectivity state, while the base stations know the fading coefficients but are uncertain about the backhaul links' state. The base stations are oblivious to the mobile users' codebooks and employ compress-and-forward to relay information to the central decoder. Upper and lower bounds are derived on average achievable throughput with respect to the prior distribution of the fading coefficients and of the backhaul links' states. The lower bounds are obtained by proposing strategies that combine the broadcast coding approach and layered distributed compression techniques. The upper bound is obtained by assuming that all the nodes know the channel state. Numerical results confirm the advantages of the proposed approach with respect to conventional non-robust strategies in both scenarios with and without fading. |
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| AbstractList | Two mobile users communicate with a central decoder via two base stations. Communication between the mobile users and the base stations takes place over a Gaussian interference channel with constant channel gains or quasi-static fading. Instead, the base stations are connected to the central decoder through orthogonal finite-capacity links, whose connectivity is subject to random fluctuations. There is only receive-side channel state information, and hence the mobile users are unaware of the channel state and of the backhaul connectivity state, while the base stations know the fading coefficients but are uncertain about the backhaul links' state. The base stations are oblivious to the mobile users' codebooks and employ compress-and-forward to relay information to the central decoder. Upper and lower bounds are derived on average achievable throughput with respect to the prior distribution of the fading coefficients and of the backhaul links' states. The lower bounds are obtained by proposing strategies that combine the broadcast coding approach and layered distributed compression techniques. The upper bound is obtained by assuming that all the nodes know the channel state. Numerical results confirm the advantages of the proposed approach with respect to conventional non-robust strategies in both scenarios with and without fading. |
| Author | Simeone, Osvaldo Karasik, Roy Shitz, Shlomo Shamai |
| Author_xml | – sequence: 1 givenname: Roy surname: Karasik fullname: Karasik, Roy email: royk@tx.technion.ac.il organization: Faculty of Electrical Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel – sequence: 2 givenname: Osvaldo surname: Simeone fullname: Simeone, Osvaldo organization: Center for Wireless Communications and Signal Processing Research, New Jersey Institute of Technology, Newark, NJ, 07102-1982 USA – sequence: 3 givenname: Shlomo Shamai surname: Shitz fullname: Shitz, Shlomo Shamai organization: Faculty of Electrical Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel |
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| Keywords | Parameter estimation Relay Clouds robust communication Base station Wireless telecommunication Information rate multicell processing Codebook Channel estimation Connectedness Broadcast coding Uplink limited backhaul Fading channels Fading Mobile radiocommunication Lower bound Source coding Prior distribution Gaussian channel Distributed source signal Transmission channel Quasi static theory Decoding Information transmission Upper bound distributed source coding Numerical simulation cloud radio access network |
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| SubjectTerms | Applied sciences Broadcast coding Channels cloud radio access network Coding, codes Decoding Detection, estimation, filtering, equalization, prediction distributed source coding Equipments and installations Exact sciences and technology Fading Information, signal and communications theory limited backhaul Mobile radiocommunication systems multicell processing Radiocommunications robust communication Signal and communications theory Signal, noise Source coding Systems, networks and services of telecommunications Telecommunications Telecommunications and information theory Throughput Transmission and modulation (techniques and equipments) Uplink Upper bound Wireless communication Wireless communications Wireless networks |
| Title | Robust Uplink Communications over Fading Channels with Variable Backhaul Connectivity |
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