Multi-layer transmission and hybrid relaying for relay channels with multiple out-of-band relays
ABSTRACTIn this work, a relay channel is studied in which a source encoder communicates with a destination decoder through a number of out‐of‐band relays that are connected to the decoder through capacity‐constrained digital backhaul links. This model is motivated by the uplink of cloud radio access...
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| Published in: | Transactions on emerging telecommunications technologies Vol. 25; no. 9; pp. 895 - 904 |
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| Main Authors: | , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Blackwell Publishing Ltd
01.09.2014
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| ISSN: | 2161-3915, 2161-3915 |
| Online Access: | Get full text |
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| Summary: | ABSTRACTIn this work, a relay channel is studied in which a source encoder communicates with a destination decoder through a number of out‐of‐band relays that are connected to the decoder through capacity‐constrained digital backhaul links. This model is motivated by the uplink of cloud radio access networks. In this scenario, a novel transmission and relaying strategies are proposed in which multi‐layer transmission is used, on the one hand, to adaptively leverage the different decoding capabilities of the relays and, on the other hand, to enable hybrid decode‐and‐forward and compress‐and‐forward relaying. The hybrid relaying strategy allows each relay to forward part of the decoded messages and a compressed version of the received signal to the decoder. The problem of optimising the power allocation across the layers and the compression test channels is formulated. Albeit non‐convex, the derived problem is found to belong to the class of so‐called complementary geometric programs. Using this observation, an iterative algorithm based on the homotopy method is proposed that achieves a stationary point of the original problem by solving a sequence of geometric programming, and thus convex, problems. Numerical results are provided that show the effectiveness of the proposed multi‐layer hybrid scheme in achieving performance close to a theoretical (cutset) upper bound. Copyright © 2013 John Wiley & Sons, Ltd.
A relay channel is studied in which a source encoder communicates with a destination decoder through a number of out‐of‐band relays that are connected to the decoder through capacity‐constrained digital backhaul links. Novel transmission and relaying strategies are proposed in which multi‐layer transmission is used to adaptively leverage the different decoding capabilities of the relays and to enable hybrid decode‐and‐forward and compress‐and‐forward relaying. |
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| Bibliography: | ArticleID:ETT2696 ark:/67375/WNG-F8J9Z6J9-Q istex:0EB7EA826383F9A62BA9A65CF7CEB6FE5AE2607F |
| ISSN: | 2161-3915 2161-3915 |
| DOI: | 10.1002/ett.2696 |