University of Oulu

S. Qian, J. He, M. Juntti and T. Matsumoto, "Fading Correlations for Wireless Cooperative Communications: Diversity and Coding Gains," in IEEE Access, vol. 5, pp. 8001-8016, 2017. doi: 10.1109/ACCESS.2017.2699785

Fading correlations for wireless cooperative communication : diversity and coding gains

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Author: Qian, Shen1,2; He, Jiguang2; Juntti, Markku2;
Organizations: 1School of Information Science, Japan Advanced Institute of Science and Technology (JAIST) 1-1 Asahidai, Nomi, Ishikawa, 923-1292 Japan
2Centre for Wireless Communications, FI-90014 University of Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 2.1 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2017
Publish Date: 2017-09-29


We theoretically analyze outage probabilities of the lossy-forward (LF), decode-and-forward (DF) and adaptive decode-and-forward (ADF) relaying techniques, with the aim of characterizing the impact of the spatial and temporal correlations of the fading variations. First, the exact outage probability expressions are analytically obtained for LF, DF, and ADF relaying assuming each link suffers from statistically independent Rayleigh fading. Then, approximated, yet accurate closed-form expressions of the outage probabilities for the relaying schemes are derived. Based on the expressions, diversity and coding gains are found. The mathematical methodology for the derivation of the explicit outage probability is further extended to the case where the account is taken of the spatial and temporal correlations of the fading variations. The diversity gains with LF, DF, and ADF are then derived in the presence of the correlations. It is found out that the three techniques can achieve full diversity, as long as the fading variations are not fully correlated. We then investigate the optimal relay location and the optimal power allocation for the three relaying techniques. It is shown that the optimal solutions can be obtained under the framework of convex optimization. It is reveal that in correlated fading, the relay should move close to the destination or allocate more transmit power to the relay for achieving lower outage probabilities, compared to the case in independent fading.

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Series: IEEE access
ISSN: 2169-3536
ISSN-E: 2169-3536
ISSN-L: 2169-3536
Volume: 5
Pages: 8001 - 8016
DOI: 10.1109/ACCESS.2017.2699785
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This research was supported in part by the European Unions FP7 project, ICT-619555 Links-on-the-fly Technology for Robust, Efficient and Smart Communication in Unpredictable Environments (RESCUE), in part by Academy of Finland project, No. 268209 the network compression based wireless cooperative communication systems (NETCOBRA), in part by Nokia Foundation and HPY Foundation, and also in part by the JAIST Doctoral Research Fellow program.
EU Grant Number: (619555) RESCUE - Links-on-the-fly Technology for Robust, Efficient and Smart Communication in Unpredictable Environments
Academy of Finland Grant Number: 268209
Detailed Information: 268209 (Academy of Finland Funding decision)
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