Neves, DarleneRibeiro, CarlosSilva, AdaoGameiro, Atilio2025-06-062025-06-062009-04D. Neves, C. Ribeiro, A. Silva and A. Gameiro, "Channel Estimation Schemes for OFDM Relay-Assisted Systems," VTC Spring 2009 - IEEE 69th Vehicular Technology Conference, Barcelona, Spain, 2009, pp. 1-5, doi: https://doi.org/10.1109/VETECS.2009.5073437.1550-2252http://hdl.handle.net/10400.8/13178Article number 5073437VTC Spring 2009 - IEEE 69th Vehicular Technology Conference, 26 April 2009 through 29 April 2009 - Code 77524The aim of this paper is to adapt and evaluate the performance of two classical pilot-aided channel estimation schemes designed for OFDM systems: least square and minimum mean square error, in a relay-assisted scenario. We consider the Amplify-and-Forward, which is the simplest relay protocol for cooperative systems. Also, we consider the use of a single antenna at all the terminals: base station, user terminal and relay node. In our scenario, it is assumed that some of the user terminals deployed in a certain area could act as relaying-able terminals for the communications of other users. In this communication we show that the classical channel estimation techniques designed for conventional wireless communications can be extended for relay-assisted based systems under some modifications.engRelay based scenariosOFDM systemsPilot-aided channel estimationcooperative systemsconference paper10.1109/vetecs.2009.5073437