STC-Based cooperative relaying system with adaptive power allocation

Authors:
Jingmei Zhang;Ying Wang;Ping Zhang
Affiliations:
WTI Labs, Beijing University of Posts and Telecommunications, P.R. China;WTI Labs, Beijing University of Posts and Telecommunications, P.R. China;WTI Labs, Beijing University of Posts and Telecommunications, P.R. China
Venue:
WWIC'05 Proceedings of the Third international conference on Wired/Wireless Internet Communications
Year:
2005

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Abstract

Cooperative relaying recently has emerged as a means of providing gains from spatial diversity to devices in a distributed manner. A cooperative relaying system deploying Alamouti’s space-time coding (STC) design is investigated in this paper. According to amplify-and-forward (AF) and decode-and-forward (DF) modes, two TDMA-based cooperative transmission schemes are presented. Considering resource utilization efficiency, adaptive power allocation (PA) algorithms are proposed to adjust the power of each hop based on different channel conditions. Most importantly, the PA results also can be used to decide whether or not to relay, which recovers the loss of spectral efficiency due to the orthogonal transmission to a great extent. Numerical results indicate that the cooperative system with adaptive PA significantly outperforms the direct transmission system. Compared with the uniform power allocation (UPA), the proposed PA algorithm with power constraint of 1W can provide (52, 54)% capacity gains at most for Scheme (I, II), respectively.