General nyquist-I pulses to mitigate carrier frequency offset in DVB-C-OFDM systems

Abstract

It is well known that the performance of orthogonal frequency division multiplexing is highly sensitive to frequency offset. In this paper, we present theoretical results to assess the intercarrier interference reduction using general pulse shaping filters in digital video broadcasting over cable (DVB-C) systems. These pulses are characterized by only one design parameter, known as the roll-off factor. We found that for the DVB standard, which employs a raised cosine (RC) function, double-jump 1 (DJ1) filter outperforms the RC pulse as well as the rest of pulses in terms of both the bit error rate and the signal-to-interference ratio power. This is because the DJ1 pulse spectra presents the smallest lateral lobes and a broad main lobe.