The frame words of the embodiments are suitable for frame synchronization and/or channel estimation. By adding the autocorrelation and/or cross-correlation functions of frame words, double maximum values equal in magnitude and opposite polarity at zero and middle shifts are obtained. This property can...http://www.google.de/patents/US7643540?utm_source=gb-gplus-sharePatent US7643540 - Pilot signals for synchronization and/or channel estimation