Abstract
Cooperative relay systems have drawn attentions in recent years because they can use an appropriate number of relays to form a virtual multiple-input multiple-output (MIMO) scenario to improve communication links. Space frequency block coding (SFBC) is a prominent spatial diversity strategy for MIMO systems, and it has been widely adopted with orthogonal frequency division multiplexing (OFDM) to achieve both spatial and frequency diversity. One major problem associated with an SFBC-OFDM cooperative relay system is the existence of multiple carrier frequency offsets (CFOs), and this would cause serious intercarrier interference (ICI) and degrade the system performance greatly. In this thesis, new transceiver designs are proposed for SFBC-OFDM cooperative relay systems, where an appropriate SFBC Alamouti encoder is adopted at the transmitter and a common CFO compensation unit, a modified SFBC decoder, and an iterative partial parallel interference cancellation (PIC) module are used at the receiver. Both of the two-relay and four-relay cases are investigated. Simulation results demonstrate that the proposed transceiver design for the two-relay case outperforms previous related works, while the one for the four-relay case also achieves pretty good performance.