Paper Info
Title
Frequency-Packed Faster-Than-Nyquist Signaling via Symbol-Level Precoding for Multiuser MISO Redundant Transmissions
Abstract
This work addresses the issue of interference generated by co-channel users in downlink multi-antenna multicarrier systems with frequency-packed faster-than-Nyquist (FTN) signaling. The resulting interference stems from an aggressive strategy for enhancing the throughput via frequency reuse across different users and the squeezing of signals in the time-frequency plane beyond the Nyquist limit. The spectral efficiency is proved to be increasing with the frequency packing and FTN acceleration factors. The lower bound for the FTN sampling period that guarantees information losslesness is derived as a function of the transmitting-filter roll-off factor, the frequency-packing factor, and the number of subcarriers. Space-time-frequency symbol-level precoders (SLPs) that trade off constructive and destructive interblock interference (IBI) at the single-antenna user terminals are proposed. Redundant elements are added as guard interval to cope with vestigial destructive IBI effects. The proposals can handle channels with delay spread longer than the multicarrier-symbol duration. The receiver architecture is simple, for it does not require digital multicarrier demodulation. Simulations indicate that the proposed SLP outperforms zero-forcing precoding and achieves a target balance between spectral and energy efficiencies by controlling the amount of added redundancy from zero (full IBI) to half (destructive IBI-free) the group delay of the equivalent channel.
Year
DOI
Venue
2022
10.1109/TWC.2022.3168188
IEEE Transactions on Wireless Communications
Keywords
DocType
Volume
Symbol-level precoding (SLP),multiuser interference (MUI),intercarrier interference (ICI),intersymbol interference (ISI),interblock interference (IBI),faster than Nyquist (FTN),frequency packing,multiple-input single-output (MISO) multicarrier (MC) systems,frequency-selective channels
Journal
21
Issue
ISSN
Citations 
10
1536-1276
0
PageRank 
References 
Authors
0.34
0
3
Name
Order
Citations
PageRank
Wallace A. Martins114.07
Symeon Chatzinotas21849192.76
Björn E. Ottersten36418575.28