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http://dx.doi.org/10.7840/kics.2014.39A.10.593

Resource Allocation Schemes for Legacy OFDMA Systems with Two-Way DF Relay  

Seo, Jongpil (Inha University, Department of Electronic Engineering)
Han, Chulhee (Samsung Thales)
Park, Seongho (Inha University, Department of Electronic Engineering)
Chung, Jaehak (Inha University, Department of Electronic Engineering)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.39A, no.10, 2014 , pp. 593-600 More about this Journal
Abstract
OFDMA systems solves frequency selective fading problem and provides improved performance by optimal allocation of subcarriers and transmit power. Two-way relay systems provide improved spectral efficiency compared to that of the conventional half-duplex relay using bidirectional communications. In legacy OFDMA system such as WiBro, two-way DF relay utilization causes pilot re-assignment and impossibility of channel estimation and decoding at relay nodes by self-interference. In this paper, resource allocation schemes for legacy OFDMA systems with two-way DF relay are proposed. The proposed schemes allocate subcarriers considering destinations nodes which are connected to relay nodes as individual nodes which are directly connected to a base station. Subsequently, the proposed schemes compensate bandwidth loss due to orthogonal allocations by overlapped allocating unused subcarriers at other noes. Numerical simulations show that the proposed resource allocation schemes provide improved performance compared with orthogonal allocation.
Keywords
two-way relay; legacy OFDMA; resource allocation;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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