National Engineering Research Center for Broadband Networks and Applications

Shanghai, China

National Engineering Research Center for Broadband Networks and Applications

Shanghai, China
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Dai X.,Southwest University | Yang Y.,CAS Shanghai Institute of Microsystem and Information Technology | Zhang Y.,National Engineering Research Center for Broadband Networks and Applications | Gao Z.,Northumbria University | Wang H.,University of Manchester
Proceedings of the 2012 UKACC International Conference on Control, CONTROL 2012 | Year: 2012

Although the Wireless Sensor and Actuator Networks (WSANs) have many advantages than the wired networks, the nature of sharing wireless media and the complicated behavior of Media Access Control (MAC) introduce adverse impacts on the control system. In contrast to most work on networked control systems using simplified models of network induced delays, this paper considers the study the random access delay caused by a contention-based MAC scheme slotted ALOHA in WSANs. An improved fault detection observer with access delay compensation is proposed to improve the fault detection performance against the MAC delays. © 2012 IEEE.


Zhang W.,CAS Shanghai Institute of Microsystem and Information Technology | Chen Y.,University College London | Yang Y.,CAS Shanghai Institute of Microsystem and Information Technology | Wang X.,Nanjing Southeast University | And 3 more authors.
IEEE Journal on Selected Areas in Communications | Year: 2012

Infrastructure-based vehicular networks (consisting of a group of Base Stations (BSs) along the road) will be widely deployed to support Wireless Access in Vehicular Environment (WAVE) and a series of safety and non-safety related applications and services for vehicles on the road. As an important measure of user satisfaction level, uplink connectivity probability is defined as the probability that messages from vehicles can be received by the infrastructure (i.e., BSs) through multi-hop paths. While on the system side, downlink connectivity probability is defined as the probability that messages can be broadcasted from BSs to all vehicles through multi-hop paths, which indicates service coverage performance of a vehicular network. This paper proposes an analytical model to predict both uplink and downlink connectivity probabilities. Our analytical results, validated by simulations and experiments, reveal the trade-off between these two key performance metrics and the important system parameters, such as BS and vehicle densities, radio coverage (or transmission power), and maximum number of hops. This insightful knowledge enables vehicular network engineers and operators to effectively achieve high user satisfaction and good service coverage, with necessary deployment of BSs along the road according to traffic density, user requirements and service types. © 2012 IEEE.


Wang Z.,Fudan University | Wang Z.,National Engineering Research Center For Broadband Networks and Applications | Wang Y.,Fudan University | Tao L.,Fudan University | Chi N.,Fudan University
Asia Communications and Photonics Conference, ACPC 2015 | Year: 2015

In this paper we demonstrate a novel 8-channel 10GHz-spaced UDWDM-PON system with highest downstream data rate of 10Gb/s per user over 42.5km SSMF transmission employing carrierless amplitude and phase(CAP) modulation and direct detection. © 2015 OSA.


Wang Z.,Fudan University | Wang Z.,National Engineering Research Center for Broadband Networks and Applications | Tao L.,Fudan University | Wang Y.,Fudan University | Chi N.,Fudan University
Chinese Optics Letters | Year: 2015

Carrierless amplitude and phase (CAP) modulation is generating increasing interest for short-reach optical communications. Polarization multiplexing (PolMux) is a good way to improve the CAP system's data rate further with the limited bandwidth of electrical devices. In this Letter, we experimentally demonstrate a 56 Gb/s directdetection PolMux CAP system over a 15 km fiber link for the first time, to our best knowledge. Two-band CAP modulation with different modulated orders for each band is employed. An optical filter at the receiver is utilized to realize the polarization separation. No extra digital signal processing for polarization-dependent distortion is required. © 2015 Chinese Optics Letters.


Lu X.,Fudan University | Xu Y.,National Engineering Research Center for Broadband Networks and Applications | Zhao K.,National Engineering Research Center for Broadband Networks and Applications | Yang W.,National Engineering Research Center for Broadband Networks and Applications
Annales des Telecommunications/Annals of Telecommunications | Year: 2015

Coordinated multi-point (CoMP) is known to be one of the key technologies for long-term evolution (LTE)-advanced systems. CoMP technology can improve system capacity and the quality of wireless communication services for users in LTE networks. However, in practice, the actual performance of CoMP technology is limited by the switching capacity of the backhaul network among distributed base stations as well as its latencies. In this paper, we propose a new cloud radio access network architecture based on RF signal soft-switching to solve this problem. Furthermore, we introduce a narrow-band parallel processing technique on a common public radio interface in downlink and uplink to reduce the volume of data as well as the latencies in the transmission process among base band units and remote radio units. By combining theoretical analysis with computer simulations, we show that the technique is valid both for downlink and uplink, i.e., it does not degrade the performance of downlink and uplink propagation between BBU pool and user equipments. Moreover, the computational time of the narrow-band parallel processing technique is less than that of the standard technique. © 2015 Institut Mines-Télécom and Springer-Verlag France


Wang Y.,Fudan University | Wang Y.,National Engineering Research Center for Broadband Networks and Applications | Tao L.,Fudan University | Huang X.,Fudan University | And 2 more authors.
IEEE Photonics Journal | Year: 2015

The light-emitting diode nonlinearity in visible light communication (VLC) systems is considered to be a major problem that deteriorates system performance. In this paper, we experimentally demonstrate a high-speed WDM CAP64 VLC system employing a Volterra series-based nonlinear equalizer to mitigate the nonlinear effect. A modified cascaded multimodulus algorithm (M-CMMA) is utilized to calculate the error function and update the weights of the nonlinear equalizer without using training symbols. An aggregate data rate of 4.5 Gb/s is successfully achieved over 2-m indoor free-space transmission with a bit error rate (BER) below the 7% forward error correction limit of 3.8× 10-3. With the Volterra nonlinear equalizer, the Q factor of the VLC system is 1.6 dB better than that without using the nonlinear equalizer, and the transmission distance is also increased by about 110 cm at the BER of 3.8× 10-3. To the best of our knowledge, this is the first time that the Volterra nonlinear equalizer is utilized for high-speed carrierless amplitude and phase (CAP) modulation-based VLC systems. © 2009-2012 IEEE.


Wang Y.,Fudan University | Wang Y.,Georgia Institute of Technology | Wang Y.,Zte United States Inc. | Wang Y.,National Engineering Research Center for Broadband Networks and Applications | And 3 more authors.
IEEE Photonics Journal | Year: 2015

The limited band of optical and electrical devices in an intensity-modulation direct detection (IM/DD) system is considered to be a major bottleneck that hinders the increase in transmission capacity. Spectrally efficient modulation formats and advanced digital signal processing are key technologies to improving the performance of IM/DD for high-speed short-reach optical systems. In this paper, we propose and experimentally demonstrate a novel Nyquist eight-level, pulse-amplitude, single-carrier modulation with frequency-domain equalization (PAM8-SCFDE). In addition, 40-GBd Nyquist PAM8-SCFDE signals can be successfully transmitted over 2-km standard single-mode fiber or 20-km large effective area fiber based on 10-G-class DAC and photodiode. Therefore, the achieved aggregate data rate is 120 Gb/s, and the measured bit error rate (BER) is under 7% pre-forward-error-correction (FEC) threshold of 3.8 × 10-3. Compared with conventional PAM8, this scheme can provide double spectral efficiency and 6-dB receiver sensitivity improvement. © 2009-2012 IEEE.


Ge C.,National Engineering Research Center for Broadband Networks and Applications | Fang X.,National Engineering Research Center for Broadband Networks and Applications
Applied Mechanics and Materials | Year: 2012

It is the largest specification effort ever in the history of PICMC association, which contains more than 100 companies participating, to work on ATCA technique. To be named as AdvancedTCA (ATCA), it is officially called PICMG 3.x protocol, which was stipulated by the PICMG organization in Dec, 2002. It is mainly targeted to achieve requirements for the next generation of "carrier grade" equipments, widely now used in telecommunication core or access networks [1]. © (2012) Trans Tech Publications, Switzerland.


Ge C.R.,National Engineering Research Center for Broadband Networks and Applications | Fang X.,National Engineering Research Center for Broadband Networks and Applications | Tan Q.,National Engineering Research Center for Broadband Networks and Applications
Advanced Materials Research | Year: 2013

Server refers to one special computer providing users with the management of resources and services. Opposed to an ordinary PC, server demands much higher stability, security, performance and etc., hence the hardware including CPU, chipset, memory, disk system, and network set is different from PC. The applications of servers range from departments of government, education, medicine, to enterprise, from one PC to one workstation, and then to one large supercomputer. Server itself plays an extremely important role as one indispensable part of current Internet industry. Now, it is widely used to serve in data center and cloud storage. Therefore, with the "Green", "Low Carbon" becoming the main trend of development of ICT industry nowadays, how to evaluate server's energy-saving target and how to improve energy-efficiency of server has become the focus of attention. [1] The paper researches on one new method of server's energy-efficiency test to accomplish the two questions above. © (2013) Trans Tech Publications, Switzerland.


Zhang J.,Zte United States Inc. | Zhang J.,Georgia Institute of Technology | Yu J.,Zte United States Inc. | Li F.,Zte United States Inc. | And 3 more authors.
IEEE Photonics Technology Letters | Year: 2015

We demonstrate the generation and detection of single-carrier electronic time division multiplexing 400 GE signal based on 120-GBd PDM PAM-4 signal. The signal performance is significantly improved by using our novel pre-equalization scheme. A line rate of 480-Gb/s is achieved, which enables 20% forward-error correction overheadto keep the record 400-Gb/s net information rate. © 2015 IEEE.

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