Novel pilot-based estimators for AF relaying channels using energy harvesting

Existing channel estimators for amplify-and-forward relaying often transmit pilots to the destination node by using the relay node's own energy. This extra energy consumption discourages the relay node from taking part in relaying. We propose two new estimators for amplify-and-forward relaying channels. In these estimators, the relay node harvests energy from the pilots sent by the source node first and then uses the harvested energy to forward the pilots from the source node as well as transmit its own pilots to the destination node. Both time-switching and power-splitting harvesting strategies are considered. The mean squared error is examined. Numerical results show that these new estimators have very good performances. They also show that optimum choices of certain system parameters exist.

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