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In this letter, we consider distributed beamforming (DBF) techniques for a two-way relaying network in which two sources exchange information through K intermediate relays under an aggregate power constraint. Especially, we construct a simple selective DBF that can be obtained at each relay with partial channel state information (CSI). By asymptotic analysis, the proposed selective DBF is shown to achieve full diversity gain K for each source and that the sum of capacities at the two sources increases as log K. Numerical investigation also shows that the selective DBF provides near optimum performance.
Date of Publication: May 2011