Effects of antenna receiver diversity with Faster-than-Nyquist signaling using OFDM/OQAM in multipath fading channel

This paper presents the effects of antenna receiver diversity with Faster-than-Nyquist (FTN) signaling employing orthogonal frequency division multiplexing (OFDM)/offset quadrature amplitude modulation (OQAM) in a multipath fading channel. We utilize a method for mapping an FTN signal to an OFDM based orthogonal basis function. Based on link-level simulations, we show that antenna receiver diversity decreases the required average received signal-to-noise power ratio (SNR) that satisfies the target average block error rate (BLER) when FTN signaling is applied to OFDM/OQAM without a cyclic prefix (CP). We also compare the BLER performance of FTN signaling with that to CP-based OFDM employing a higher-level modulation scheme with almost the same frequency efficiency. Through the evaluations, we show the effectiveness of FTN signaling for OFDM/OQAM from the viewpoint of improving the frequency efficiency when receiver diversity with 8 antennas is employed.