Two-way space shift keying with relay selection

In this paper, a two-way multiple-input multiple-output (MIMO) space shift keying (SSK) scheme with relay selection is proposed for amplify-and-forward relaying. In this scheme, the sources exchange their SSK symbols via a selected relay node. We derive a theoretical upper-bound expression and we also perform an asymptotic performance analysis for the average error probability of the proposed system. It is shown that the proposed system outperforms conventional two-way SSK scheme without relay selection.