Relay Selection with Outdated Channel Estimates in

We study the effect of outdated channel estimates on decode-and-forward relay selection, when operating over Nakagami-m fading channels. Closed-form expressions for the exact outage probability are derived as function of the correlation between the actual and the estimated channel values. The diversity and coding gain are also studied, revealing a high dependence of diversity order on the aforementioned correlation coefficient. It is shown that when the channel estimates are not perfectly updated, the performance of relay selection is equivalent, in terms of diversity order, to the scheme where only a single relay is available.

[1]  I. S. Gradshteyn,et al.  Table of Integrals, Series, and Products , 1976 .

[2]  J. Reig,et al.  Bivariate Nakagami-m distribution with arbitrary fading parameters , 2002 .

[3]  Andreas F. Molisch,et al.  Energy-Efficient Cooperative Relaying over Fading Channels with Simple Relay Selection , 2008, IEEE Transactions on Wireless Communications.

[4]  Raviraj S. Adve,et al.  Selection cooperation in multi-source cooperative networks , 2008, IEEE Transactions on Wireless Communications.

[5]  Neelesh B. Mehta,et al.  Relay Selection and Data Transmission Throughput Tradeoff in Cooperative Systems , 2009, GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference.

[6]  Dongwoo Kim,et al.  Comparison of tightly power-constrained performances for opportunistic amplify-and-forward relaying with partial or full channel information , 2009, IEEE Commun. Lett..

[7]  Murat Uysal,et al.  On relay selection for decode-and-forward relaying , 2009, IEEE Transactions on Wireless Communications.

[8]  Murat Uysal.  Cooperative Communications for Improved Wireless Network Transmission: Framework for Virtual Antenna Array Applications , 2009 .

[9]  Gonzalo Seco-Granados,et al.  Opportunistic relay selection with outdated CSI: outage probability and diversity analysis , 2009, IEEE Transactions on Wireless Communications.

[10]  George K. Karagiannidis,et al.  Amplify-and-Forward Relay Selection with Outdated Channel State Information , 2010, 2010 IEEE Global Telecommunications Conference GLOBECOM 2010.

[11]  Joseph Lipka,et al.  A Table of Integrals , 2010 .

[12]  He Chen,et al.  Approximate SEP Analysis for DF Cooperative Networks With Opportunistic Relaying , 2010, IEEE Signal Processing Letters.

[13]  Mischa Dohler,et al.  Cooperative Communications: Hardware, Channel and PHY , 2010 .

[14]  David Haccoun,et al.  Capacity Analysis of Opportunistic Relaying in Cooperative Systems with Outdated Channel Information , 2010, IEEE Communications Letters.

[15]  Sami Muhaidat,et al.  Performance Analysis of Relay Selection With Feedback Delay and Channel Estimation Errors , 2011, IEEE Signal Processing Letters.