Realizing Multi-Gbps Vehicular Communication: Design, Implementation, and Validation

Abstract

This paper proposes a vehicular communication system that can achieve multi-Gbps data rate transmission for train and car applications. Employing a millimeter-wave frequency band around 25 GHz, the proposed system provides mobile backhaul connectivity for vehicle user equipments (UEs). In order to support a very high data rate with such a high carrier frequency while guaranteeing sufficient robustness against high mobility-related behaviors such as fast channel variation and unstable handover, we employ a relaying network architecture consisting of a backhaul link to a vehicle UE and an in-vehicle access link. Based on that, we provide a set of fundamental design elements including numerology, frame structure, the reference signal, multi-antenna scheme, and handover. We then validate the proposed vehicular communication system by implementing an experimental testbed consisting of baseband modem, RF front end, an array antenna units, and by performing field trials in an actual subway tunnel and urban road environments. The experimental validation results reveal that providing multi-Gbps backhaul transmission is possible and worthwhile for both train and car scenarios. INDEX TERMS 5G, high mobility, mmWave, testbed, vehicular communications.

Small Cells Enabled by Crowdsourced Radio Units Mounted on Parked Vehicles for Smart City

“…A joint allocation problem was proposed in [18] to enhance the quality-of-service (QoS) in cellular networks considering power consumption. To support mobile backhaul connectivity for vehicle mounted cells, a multi-Gbps vehicular communication system was proposed in [19]. It achieves multi-Gbps data rate transmission for train and car applications by efficiently allocating resources in moving environments that create time-varying interference using millimeter-wave (mmWave) frequency band.…”

Interference Cancellation, Channel Estimation, and Symbol Detection for Communications on Overlapping Channels

“…We consider the simulation setting in which the desired receiver has N r = 2 antennas, the coefficient α is chosen in the set {0.95, 0.97, 0.99, 0.995, 0.999}. 8 The bandwidth of the interfering signal is two times of the bandwidth of the desired signal, which are 30kHz and 15kHz, respectively. The frequency spacing f between interfering and desired signals will be normalized as f T d where T d denotes the symbol time of the desired signal.…”

“…The associate editor coordinating the review of this manuscript and approving it for publication was Rui Wang . communication techniques for high mobility environments is of high importance and has attracted increasing research attention [6]- [8].…”

“…In order to obtain this result, we note that the number of considered pilot symbols in the iterative method is equal to the frame length 8. In Clarke's mode, α = J 0 (2πf D T d ), where f D is the maximum Doppler spread[44] (recall that T d is the symbol period of the desired signal).…”

A Compact Hemispherical Beam-Coverage Phased Array Antenna Unit for 5G mm-Wave Applications

“…Nevertheless, the coverage issue has remained for some scenarios in mm-wave 5G wireless services, such as vehicle-to-infrastructure (V2I)/high-speed train (HST)/airto-ground (A2G) communications [21][22][23][24], indoor access points (AP) [25], and small-cell base transmit systems (BTS) [26] shown in Fig. 1.…”