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Technical Program

Paper Detail

Paper IDD7-S6-T1.1
Paper Title Eigenvalue Decomposition Precoded Faster-Than-Nyquist Transmission of Index Modulated Symbols
Authors Prakash Chaki, Takumi Ishihara, Shinya Sugiura, The University of Tokyo, Japan
Session D7-S6-T1: Topics in Index Modulation
Chaired Session: Tuesday, 20 July, 23:40 - 00:00
Engagement Session: Wednesday, 21 July, 00:00 - 00:20
Abstract In this paper, we propose a precoded faster-than-Nyquist (FTN) signaling technique for time-domain single-carrier index modulated (IM) symbol transmission. More precisely, eigenvalue decomposition precoding is adopted for the FTN transmission of data bits modulated by single-carrier time-domain IM. While the FTN scheme increases the spectral efficiency and data rate by imparting the density of transmit symbols, time-domain IM works towards the same objective while maintaining symbol sparsity. Hence, it becomes possible to counter inter-symbol interference introduced by FTN. We analytically derive the constrained capacity of the proposed system. Our simulation results show that the proposed scheme has better bit error ratio (BER) performance over the conventional FTN-IM scheme, particularly for the scenario of a higher packing ratio. In the proposed scheme, $2.5$-dB performance gain is observed at the BER of $=10^{-4}$, where the packing ratio of $0.7$ and the roll-off factor of $0.5$ in a channel-uncoded scenario.