Block Error Rate Performance of OFDM with Faster-than-Nyquist Signaling Using TDM Based Reference Signal Multiplexing

摘要

This paper presents the average block error rate (BLER) performance using time division multiplexing (TDM) based reference signal (RS) multiplexing for faster-than-Nyquist (FTN) signaling in orthogonal frequency division multiplexing (OFDM). We propose a subframe structure in which a cyclic prefix (CP) is appended to only the TDM based RS block and the first FTN symbol to achieve accurate estimation of the channel response in a multipath fading channel with a low CP overhead. We apply a minimum mean square error based turbo soft interference canceller to suppress high-level inter-symbol-interference (ISI) and inter-subcarrier-interference (ICI) caused by FTN signaling. Computer simulation results show that the loss in the required average received signal-to-noise power ratio satisfying the average BLER of 10^{?2 of FTN signaling using the TDM RS based channel estimation with the proposed subframe structure is decreased by approximately 1.2 and 1.8 dB. This is compared to that assuming ideal channel estimation for QPSK and 16QAM, respectively, when the improvement ratio of the spectral efficient from CP-OFDM is 1.31 with the rate-1/2 turbo code.}