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In this paper, an orthogonal training signal relaying technique for channel estimation in a dual-hop Amplify and Forward (AF) relay network with multiple relays is proposed. In an existing technique, the cross interference occurs between the precoded training signals of the relays since their precoded noise vector terms are not orthogonal. This leads to an increased channel estimation Mean Squared Error (MSE) at the destination. To tackle the cross interference problem without changing the channel estimator at the destination, the authors propose to use an additional step at each relay prior to training signal precoding. That is, converting the received training signal vector to a scalar channel estimate term via estimating the channel of the first hop at each relay. In this case, the received noise vector at each relay is converted to an scalar channel estimation error term.
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