Abstract
In this paper, we present the design and the experimental demonstration of a radio over fiber (RoF) network relying on state-of-the-art spatial modulation (SM), that activates one out of multiple antennas. We propose a novel RoF-aided SM encoding scheme, where the optical single side-band signal generated by a Mach-Zehnder modulator (MZM) is used for both the antenna selection and for the classic modulated symbol selection. The SM encoding is optically processed in a centralized fashion, aiming for the reduction of power consumption and for enabling cost-effective maintenance and management, which can be employed in the context of a cloud radio access network (C-RAN) and a small-cell front-haul. Furthermore, an experimental demonstration of the proposed system is discussed and analyzed, where a 20 km standard single mode fiber (SSMF) is used for transmission. In this experiment, a 2 Gbps transmission relying on two transmit and two receive antennas is achieved with less than 1 dB SNR degradation compared to those operating without RoF.
Highlights
Due to the rapidly expanding mobile industry and the emerging Internet of Things (IoT), meeting the demands of seemless, low-latency communication requires the exploration of using new radio frequencies and employing more base-staions to improve the channel capacity and to reduce the Inter-Channel-Interference (ICI) [1]
We experimentally characterize the critical elements of our system by demonstrating a 2 Gbps Radio over Fiber (RoF)-aided Binary Phase Shift Keying (BPSK) Spatial Modulation (SM) system combined with convolutional coding, where we show that the Signal-to-Noise Ratio (SNR) performance is less than 1 dB away from that of the system operating without the RoF
Instead of implementing the SM encoding scheme at each radio access points (RAPs), which adds extra complexity constituted by the antenna-switches, we propose a RoF system, which optically encodes the SM symbols in a central office with the aid of centralized processing, where the actively powered switches are replaced by the passive optical components of the RAPs
Summary
Due to the rapidly expanding mobile industry and the emerging Internet of Things (IoT), meeting the demands of seemless, low-latency communication requires the exploration of using new radio frequencies and employing more base-staions to improve the channel capacity and to reduce the Inter-Channel-Interference (ICI) [1]. We design an energy-efficient RoF network relying on twin-antenna SM encoding at the central office, where the SM switches are eliminated, significantly simplifying the transceiver design and reducing both the complexity as well as the power consumption of the RAPs of the conventional architecture relying on actively powered SM switches. This design can be used in the context of C-RANs and small-cell front-hauls for facilitating cost-effective management and site maintenance.
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