NDLI: Achievable diversity-vs-multiplexing tradeoffs in half-duplex cooperative channels

Content Provider	IEEE Xplore Digital Library
Author	Azarian, K. El Gamal, H. Schniter, P.
Copyright Year	2004
Description	Author affiliation: Dept. of Electr. Eng., Ohio State Univ., Columbus, OH, USA (Azarian, K.; El Gamal, H.; Schniter, P.)
Abstract	In this paper, we propose novel cooperative transmission protocols for delay limited coherent fading channels consisting of N (half-duplex and single-antenna) partners and one cell site. In our work, we differentiate between the cooperative relay, broadcast, and multiple-access channels. The proposed protocols are evaluated using the Zheng-Tse diversity-multiplexing tradeoff. For the relay channel, we investigate two classes of cooperation schemes; namely, amplify and forward (AF) and decode and forward (DF). For the first class, we propose a new AF protocol and show it to outperform the space-time coded protocol of Laneman and Wornell without requiring decoding/encoding at the relays. For the class of DF protocols, we develop a dynamic decode and forward (DDF) protocol that achieves the optimal tradeoff for multiplexing gains 0 /spl les/ r /spl les/ 1/N. Furthermore, with a single relay, the DDF protocol is shown to dominate the class of AF protocols for all multiplexing gains. The superiority of the DDF protocol is shown to be more significant in the cooperative broadcast channel. The situation is reversed in the cooperative multiple-access channel where we propose a new AF protocol that achieves the optimal tradeoff for all multiplexing gains. A distinguishing feature of the proposed protocols in the three scenarios is that they do not rely on orthogonal subspaces, allowing for a more efficient use of resources.
Starting Page	292
Ending Page	297
File Size	430671
Page Count	6
File Format	PDF
ISBN	0780387201
DOI	10.1109/ITW.2004.1405317
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-10-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Protocols Relays Decoding Broadcasting Fading Delay Neutron spin echo Context Channel state information Receiving antennas
Content Type	Text
Resource Type	Article

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