Oblivious Sequential Decode and Forward Cooperative Strategies for the Wireless Relay Channel

• Published in: IEEE transactions on communications Vol. 60; no. 11; pp. 3228 - 3238
• Main Authors: Braginskiy, Evgeniy, Steiner, Avi, Shitz, Shlomo Shamai
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01-11-2012; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Access methods and protocols, osi model; Applied sciences; Broadcast approach; Broadcasting; Channels; Codes; cooperative strategies; Decoding; Detection, estimation, filtering, equalization, prediction; Dynamics; Exact sciences and technology; Fading; Information, signal and communications theory; multi layer codes; Networks; oblivious relaying; Radiocommunications; Relay; Relays; Resource management; Signal and communications theory; Signal, noise; Strategy; Studies; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Teleprocessing networks. Isdn; Throughput; Transmission and modulation (techniques and equipments); Transmitters; Transmitters. Receivers; Wireless communication; Wireless networks; Performance evaluation; Relaying; Parameter estimation; Relay; AWGN; Wireless telecommunication; Information rate; Transmitter; AWGN channels; Channel estimation; Broadcasting; Routing protocols; MISO system; Fading; Lower bound; cooperative strategies; Transmission protocol; Decoding; Information transmission; oblivious relaying; Relay channel; multi layer codes; Telecommunication channels; Wireless network; Broadcast approach
• ISSN: 0090-6778; 1558-0857
• DOI: 10.1109/TCOMM.2012.081512.110361

In a dynamic wireless network where a source terminal communicates with a destination, in presence of other users in the network, it is worthwhile to consider oblivious relaying strategies of a relay in close proximity to the source transmitter. The source-relay channel is assumed to be a fixed gain additive white Gaussian noise (AWGN) channel due to source-relay colocation. The source-destination and the relay-destination transmissions are subject to block flat fading dynamics. A perfect channel state information (CSI) at the respective receivers only is assumed. With the expected throughput as a performance measure, we incorporate a two-layer broadcast approach into a cooperative strategy based on the decode-and-forward scheme - Sequential Decode-and Forward (SDF). The broadcast approach splits the transmitted rate into superimposed layers, corresponding to a "bad" and a "good" channel states, allowing better adaptation to the actual channel conditions. The achievable rate expressions for the SDF strategy are derived under the broadcast approach for multiple settings including single user, multiple-input single-output (MISO) and the general relay setting using successive decoding technique, both numerically and analytically. Continuous broadcasting lower bounds are derived for the MISO and for the oblivious cooperation scenarios.