  The accuracy of channel state information (CSI) is critical for improving the
capacity of wireless networks. In this paper, we introduce a training protocol
for wireless relay networks that uses channel estimation and feedforwarding
methods. The feedforwarding method is the distinctive feature of the proposed
protocol. As we show, each relay feedforwards the imperfect CSI to the
destination in a way that provides a higher network capacity and a faster
transfer of the CSI than the existing protocols. In addition, we show the
importance of the effective CSI accuracy on the wireless relay network capacity
by comparing networks with the perfect effective CSI, imperfect effective CSI,
and noisy imperfect effective CSI available at the destination.
