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Adaptive frequency-domain puncturing for turbo coded single-carrier transmission

This paper proposes an adaptive frequency-domain (spectrum) puncturing method for turbo coded single-carrier transmission. The proposed method is based on previous work on frequency-domain puncturing at the transmitter and turbo equalization at the receiver. While we previously assumed fixed frequency-component puncturing, the newly proposed method adaptively selects the frequency components to be punctured for frequency efficiency enhancement assuming channel knowledge at the transmitter. By selecting frequency components whose channel gains are relatively low for puncturing, the inter-symbol interference due to the frequency-domain channel variation caused by the frequency-selective fading is reduced and the received signal power is increased. As a result, the proposed adaptive frequency-domain puncturing method enhances the error rate at the receiver. Simulation results show the improvement in the error rate by using the proposed method compared to the conventional method.