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In-band full-duplex relay (FDR) has attracted much attention as an effectivesolution to improve the coverage and spectral efficiency in wirelesscommunication networks. The basic problem for FDR transmission is how toeliminate the inherent self-interference and re-use the residualself-interference (RSI) at the relay to improve the end-to-end performance.Considering the RSI at the FDR, the overall equivalent channel can be modeledas an infinite impulse response (IIR) channel. For this IIR channel, a jointdesign for precoding, power gain control and equalization of cooperative OFDMrelay systems is presented. Compared with the traditional OFDM systems, thelength of the guard interval for the proposed design can be distinctly reduced,thereby improving the spectral efficiency. By analyzing the noise sources, thispaper evaluates the signal to noise ratio (SNR) of the proposed scheme andpresents a power gain control algorithm at the FDR. Compared with the existingschemes, the proposed scheme shows a superior bit error rate (BER) performance.

A Joint Design for Full-duplex OFDM AF Relay System with Precoded Short Guard Interval