Overlap and Save Frequency Domain DFE for Throughput Efficient Single Carrier Transmission

Abstract:
In this paper we propose a non linear equalization structure operating in the frequency domain (FD) for broadband wireless transmission. As a distinctive feature this equalizer does not require any block transmission format. By applying the feedforward filter in the FD with an overlap and save technique on blocks of the received signal, a bandwidth efficient decision feedback FD equalizer is derived, denoted extension-less FD-DFE (EL-FD-DFE). In order to reduce the inter-symbol (ISI) and inter-block (IBI) interference which affect the equalized signal, a IBI canceller is used among blocks, while the equalizer filters are designed taking into account the ISI due to the absence of the extension. A comparison with orthogonal frequency division multiplexing (OFDM) and existing equalizers is provided, showing that the EL-FD-DFE has a significantly higher achievable throughput.