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Dan Fei - IEEE Xplore Author Profile

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To avoid the deterioration of in-band flatness caused by radio frequency front-ends such as frequency converters in ultra-wideband millimeter-wave channel emulation systems, this paper proposes a digital equalization method that combines filter coefficients with channel time-varying impulse responses. The channel emulation and flatness filter compensation functions are simultaneously realized thro...Show More
5G network for railway (5G-R) emerges as a promising train-ground communication solution, concurrently facing ubiquitous connectivity and reliable transmission design challenges. This paper focuses on the impact of different channel models and Doppler effects on the physical layer transmission performance of the 5G-R communication system. Based on the 5G-R channel hardware-in-the-loop simulation p...Show More
With the advancement of high-speed railways (HSR), an accurate channel model is crucial for designing and evaluating HSR wireless systems. This paper designs a passive Multiple Input Multiple Output (MIMO) channel measurement platform based on Software Defined Radio (SDR). The platform utilizes Channel State Information-Reference Signal(CSI-RS) to perform channel measurement. The platform's accura...Show More
With the rapid advancement of coastal fisheries, marine tourism, and unmanned maritime technology, there is an increasing need for maritime mobile communication. In this research, we conducted measurements on the maritime mobile channel operating at 2.2 GHz. Utilizing the obtained measurement data, we performed an in-depth analysis and evaluation of the quasi-stationary regions within the channel....Show More
With the rapid development of unmanned aerial vehicle (UAV) technology, UAV systems have evolved from single machine to multimachine cooperation. Among the core technologies of UAV swarm systems, UAV swarm communication technology is increasingly receiving attention. The current modeling of UAV channels only considers communication between receiving and transmitting nodes, typically overlooking th...Show More
A channel measurement system for accurate modeling of the millimeter-wave (mmWave) band air-to-ground (A2G) wireless channel is presented. The measurement system consists of a ground station on a small cart and an air station installed on a custom-made octocopter unmanned aerial vehicle (UAV). Channel sounders at 26 GHz mmWave band with a bandwidth of 1 GHz are mounted on the air station and the g...Show More
The study of sub-1 GHz wireless channels in wooded hilly terrain (WHT) holds significant importance for the deployment and optimization of emergency communication systems. In this letter, we conduct a comprehensive measurement of broadband channels at 380 and 640 MHz in WHT. From the measured data, we extract and model the root-mean-square (rms) delay spread and shadow fading (SF) for both line-of...Show More
The Industrial Internet of Things (IIoT) enables machines to communicate robustly. High reliability, high throughput, and low latency are the critical capabilities of IIoT, which have posed great challenges to existing wireless solutions for industrial applications. Due to the vast available bandwidth, the emerging millimeter-wave (mmWave) technology is promising to address this bottleneck. Howeve...Show More
Metal pipelines are thought to provide efficient solutions for the conditions in which high-speed maglev trains operate. A key component of the maglev system’s foundation is wireless communication. Due to the confined space, metal walls and the use of leaky coaxial cables (LCXs), the wireless channel characteristics are quite unique within the pipelines. This paper presents the first channel measu...Show More
With the emergence of various IoT applications, a large-scale IoT system is set to revolutionize the various industry. Massive machine type communication will play a crucial role in providing robust support to this system. However, in mMTC, implementing user access control to block malicious users remains a critical issue that needs to be addressed. To this end, this paper proposes a user access c...Show More
In this paper, fixed-point channel measurements for emergency communication scene in the primeval forest were conducted at emergency communication frequency band. We estimate and model channel characteristics based on the measured data within 100 m by taking 5 m as the step fixed point in the primeval forest. The emergency frequency band is 380 MHz and the corresponding bandwidth is 20 MHz. Based ...Show More
Vehicular communication has been widely concerned by academia and industry. Wireless channel characterization and modeling are the foundation of communication systems. Compared with typical road scenarios such as urban and suburban areas, wireless channel characterization in intersections is a challenging task. In this article, channel measurements at 5.9 GHz in street intersection scenarios are c...Show More
Orthogonal time frequency space (OTFS) modulation is an emerging technology to tackle time-frequency (TF) selective channel in high mobility scenarios. In OTFS, resource is multiplexed in the delay-Doppler (DD) domain. Based on the potential sparsity, separability, stability and compactness of the channel spreading function, OTFS is able to realize lower complexity of channel estimation, higher di...Show More
The Fifth Generation (5G) mobile communication system is applied in vertical industries. Industrial manufacturing is one of the most important vertical industry, where the electromagnetic interference is very complex. This electromagnetic interference seriously impacts the 5G network. In this paper, we aim to characterize interference based on realistic measurement data collected in a smart factor...Show More
In this paper, ray-tracing technology is used to investigate the train-to-train (T2T) wireless channel at 2.1 GHz, mainly between trains in the same direction and at the same speed in high-speed rail. The channel characteristics are analyzed, including propagation path, path loss, multipath clustering and delay spread, Rice factor, spatial characteristics and channel stationarity. It is found that...Show More
This paper presented a novel millimeter-wave channel measurement platform for the 6G intelligent railway. This platform used phased array antenna with 64 elements and can support instant bandwidth up to 1 GHz. Combined with improved multi-tone sounding signals, the platform can enhance dynamic measurement capability in high-speed railway scenarios. We performed calibration works about frequency fl...Show More
The unmanned aerial vehicle (UAV) swarms are broadly utilized for rescuing, detection, condition monitoring, and cognitive converting nowadays. For optimizing swarm cooperation, robust inter- Uavnetworks are required. This forms a strong motivation for channel characterization of the inter- Uavchannels. However, despite the UAV attitude being a influential factor of inter- Uavchannels, it is still...Show More
In this paper, an 8*8 phased array antenna is used to conduct measurement campaigns in the 26GHz frequency band in an indoor scenario. Based on the measured data, the typical channel parameters such as delay, power, angle of arrival, and angle of departure are clustered. The measurements captured the spatial properties of millimeter-wave (mm-wave) propagation with a center frequency of 26 GHz. Aft...Show More
Recently, reconfigurable intelligent surface (RIS) has drawn much attention due to its capability of improving coverage and communication performance. The development of RIS-assisted communication technology relies on deep understanding of RIS channel characteristics. However, most of the existing investigations focus on the impact of RIS, ignoring the existence of local scatterers in the real pro...Show More
The rapid development of Hyperloop puts forward the new requirements of wireless communication. The purpose of this paper is to improve the existing standard wireless communication system, and to suppress the Doppler effect by expanding the subcarrier spacing to meet the communication requirements in the ultra-high-speed environment. In this paper, a verification system was built based on the SDR(...Show More
The fifth-generation (5G) communication facilitates the development of smart transportation and the analysis of wireless channel's characteristics becomes crucial, whlie traditional measurement scheme has the difficulty of setting up the transmitter. This paper focuses on the high-speed railway (HSR) wireless channel measurement scheme based on 5G downlink standard signal, which is the current net...Show More
High-Speed Railway (HSR) measurement is very difficult, with the limitation of policy, complexity, cost and safety constraints. A technique performing high velocity measurement at low velocity has been proposed in the existing literature, which has not been studied well in the measurement environment. In this paper, the experimental assessment of this technique from the perspective of wireless cha...Show More
This paper mainly investigates the impact of cochannel interference between the Long Term Evolution-Railway (LTE-R) wireless channel and the Global System for Mobile Communications-Railway (GSM-R) wireless channel on the Quality of Service (QoS) of GSM-R network in 930-935MHz band. The measurement environment and measurement system are presented. The measurement results of transmission interferenc...Show More
A practical and novel research of radio propagation channel modeling is mainly presented in this paper. This is the first comprehensive result of path loss, large-scale fading and small-scale fading under long-term evolution frequency division duplex railway testing network (LTE-R) whose downlink center frequency is set at 465MHz, bandwidth is 5MHz. Besides, a detailed description of the measureme...Show More
In this paper we investigate the statistical channel characterizations in a highway scenario at 460MHz with 20MHz bandwidth. Based on the measurements, the channel characterizations, such as Ricean K-factor, root mean square (RMS) delay spread and multipath statistics are analyzed and modeled. The results can promote the evaluation and verification of wireless communication system at 460 MHz in a ...Show More