Interference Cancellation for Single Carrier Frequency Domain Equalizer without Cyclic Prefix

Abstract

In this paper, we propose a method to mitigate the interferences for single carrier frequency domain equalizer (SCFDE) without cyclic prefix (CP). SC-FDE systems suffer from the interferences when CP is appended insufficiently. Inter block interference (IBI) is introduced by the previous block, and inter symbols interference (ISI) is also generated by imperfection of the circulant channel matrix. The proposed method can effectively restore the channel matrix to be circulant, but the interference is also increased. Thus, some method, to make a compromise between compensating ISI and increasing the interference, is needed and is that the criterion is adopted to maximize the signal to interference plus noise ratio in this paper. However, the improvement of the performance is limited since the interferences are not removed. To overcome it, the interferences are cancelled using iterative MMSE receiver structures. The performance of the system outperforms that of conventional CP reconstruction method, and it is verified by computer simulations.