Abstract
During the first phase of the deployment of 5th generation (5G) networks, new radio (NR) base station (BS) and user equipment (UE) are expected to operate alongside pre-existing 4th generation (4G) networks. One important prerequisite for this coexistence to be harmlessly achieved is that the presence of NR devices should not disrupt the service requested, delivered and obtained by the legacy long-term evolution (LTE) system. This paper proposes a solution to be adopted by NR UEs to perform an uplink transmission towards the NR BS over the same time and frequency resources as the LTE system. To guarantee the absence of interference at the LTE BS, we design a new waveform termed as inverse discrete Fourier transform-based Vandermonde-subspace frequency division multiplexing (IDFT-VFDM). This solution is characterized by two important features. First, an NR UE communicating with an NR BS through IDFT-VFDM would not generate any interference at the legacy LTE BS(s), regardless of the number of antennas present at both ends of the interference channel(s), and without requiring any hardware or software change to the legacy LTE system. Second, an IDFT-VFDM signal can always be designed in order to span the same signal bandwidth as a legacy single-carrier frequency division multiple access signal for LTE uplink communications. Numerical results assess the merit of IDFT-VFDM and confirm its potential as a candidate solution to achieve LTE/NR uplink coexistence in multi-antenna multi-user scenarios.
Published Version
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