Neves, D.Ribeiro, CarlosSilva, A.Gameiro, A.2025-11-042025-11-042011-10D. Neves, C. Ribeiro, A. Silva and A. Gameiro, "An iterative pilot-data aided estimator for OFDM-based relay-assisted systems," 2011 IEEE Third Latin-American Conference on Communications, Belem, Brazil, 2011, pp. 1-6, doi: 10.1109/LatinCOM.2011.6107414.978-1-4673-0277-72330-989Xhttp://hdl.handle.net/10400.8/14502We propose and assess a pilot-data aided channel estimation scheme for realistic relay-assisted scenarios designed for the downlink SFBC OFDM-based systems. We consider that both the base station and the relay node are equipped with an antenna array whereas the user terminal is a single antenna device. The relay protocol considered is equalise-and-forward. The channel estimation method iteratively uses the information carried by the pilots and data to improve the estimate of the equivalent channels for the path Base Station - Relay Node - User Terminal. The MMSE criterion is used in the design of the estimator for both the pilot-based and data-aided iterations. The results show the benefits of cooperation in terms of MSE and also show that the proposed scheme allows, with a single data iteration, a reduction of the number of pilots when compared with non-data-aided schemes.engconference paper10.1109/latincom.2011.6107414