On the Achievable Diversity Multiplexing Tradeoff for the Optimal Time Allocation in the Two-Way Channel

Ao ZHAN  Chen HE  Ling-ge JIANG  

IEICE TRANSACTIONS on Communications   Vol.E94-B   No.9   pp.2624-2628
Publication Date: 2011/09/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.2624
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Fundamental Theories for Communications
DMT,  ODF,  OAF,  NDF,  NAF,  network coding,  

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In a two-way half-duplex system where source nodes are equipped with multiple antennas and a relay with a single antenna, we study the diversity multiplexing tradeoff (DMT) achieved by orthogonal decode-and-forward (ODF), orthogonal amplify-and-forward (OAF), non-orthogonal decode-and-forward (NDF) and non-orthogonal amplify-and-forward (NAF), respectively. Their closed-form DMT are derived with given transmission time of each terminal, and optimized by allocating the transmission time. From these analyses, NDF achieves the best performance in terms of DMT in low spectral efficiency scenarios, while NAF outperforms other protocols in high spectral efficiency scenarios.