Virtual Full-Duplex Wireless Communications with Zero-Interval Modulation and Sampling

TL;DR

This paper introduces a novel virtual full-duplex wireless communication method using zero-interval modulation and sampling, enabling simultaneous transmission and reception with self-interference mitigation, thereby increasing capacity.

Contribution

The paper proposes a new ZIMS-VFD technique that achieves full-duplex-like performance with zero self-interference, extending it from SISO to MIMO systems.

Findings

Effectively increases system capacity.

Approaches full-duplex performance without self-interference.

Validated through numerical simulations.

Abstract

In this paper, we propose a virtual full-duplex (VFD) technique with zero-interval modulation and sampling (ZIMS), where two half-duplex (HD) transceivers can simultaneously transmit signals and each transceiver can effectively receive the desired information. In ZIMS-VFD, the transceiver inserts a zero-interval for each symbol in the transmit signal and provides self-interference (SI)-free intervals for itself. Meanwhile, it samples the receive signal in the provided SI-free intervals and restores the desired symbols. Based on orthogonal frequency division multiplexing (OFDM), we formulate the system model and show the transmit signal structure. Then, we give the transceiver design for single input single output (SISO) ZIMS-VFD and extend it to multiple input multiple output (MIMO) communications. Numerical results verify our theoretical analyses and show that ZIMS-VFD can effectively increase the capacity and approach the FD without SI.