A Subtractive Interference Cancellation Scheme for Single Carrier Block Transmission with Insufficient Cyclic Prefix

We propose a simple inter-symbol interference (ISI) and inter-block interference (IBI) cancellation scheme for single carrier block transmission with cyclic prefix (SCCP) systems with insufficient guard interval (GI). In the SC-CP system, the equalization and demodulation processing is conducted in a block-by-block manner, therefore, the IBI can be reduced by using previously detected data signals. For the ISI cancellation, we firstly generate replica signal of the ISI using tentative decisions in order to make the defective channel matrix to be circulant, and then we perform the conventional FDE to compensate the ISI. We also derive minimum mean–square–error (MMSE) and zero forcing (ZF) equalizers for the shake of performance benchmark. Computer simulation results show that the proposed interference cancellation scheme can significantly improve the bit error rate (BER) performance and can outperform the MMSE equalizer while it requires lower computational complexity.