A Pilot Design Technique for Single-Carrier Transmission Over Fast Fading Relay Channels

Relay-assisted Space-Time Block Code (STBC) and Space-Frequency Block Code (SFBC) for Single Carrier Frequency-Domain Equalization (SC-FDE) were presented. They achieve spatial diversity over fading relay channels under the assumption of perfect Channel State Information (CSI). In this paper, the authors propose a pilot position selection/detection technique for channel estimation of those systems. Unlike the conventional block-type channel estimation techniques, the proposed scheme superimposes pilots on data-carrying tones whose positions are selected to minimize the distortion of original signals.