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.
This paper is supported by NSFC (No. 60302024, 60496312).
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© 2005 Springer-Verlag Berlin Heidelberg
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Zhang, J., Wang, Y., Zhang, P. (2005). STC-Based Cooperative Relaying System with Adaptive Power Allocation. In: Braun, T., Carle, G., Koucheryavy, Y., Tsaoussidis, V. (eds) Wired/Wireless Internet Communications. WWIC 2005. Lecture Notes in Computer Science, vol 3510. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11424505_33
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DOI: https://doi.org/10.1007/11424505_33
Publisher Name: Springer, Berlin, Heidelberg
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