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Nanjing, China

Chen G.,PLAUST | Wu X.,Institution of Communication Engineering | Zhang W.,Institution of Communication Engineering | Zheng X.,Institution of Communication Engineering
Journal of Networks | Year: 2011

A novel cross-layer wireless resource allocation algorithm called DBMQT is proposed which distributes the resource based on dynamic buffer allocation mechanism for orthogonal frequency division multiplex access (OFDMA) system. The aim of allocation algorithm is to maximize system throughput while satisfying the QoS requirement for multi-user and multi-service. The algorithm consists of two steps. Firstly, with the assumption of a finite queue model for arrival packets, the scheme adjusts users' buffer according to dynamic buffer allocation mechanism. In the second step, a distinct scheduling priority is defined for each user integrates MAC QoS requirements, queue status and PHY Channel State Information (CSI), assuming that the power is uniformly allocated on each subcarrier. Using these scheduling priorities, a scheduling rule for mixed traffics is proposed. Simulation results indicate that the proposed algorithm can achieve better performance in terms of system throughput, packet loss rate and efficiency of the buffer than tradition algorithm under enhancing QoS guarantees for different services. © 2011 ACADEMY PUBLISHER.

Miao J.-J.,Postgraduate Team 1 ICE | Xu Z.-P.,PLAUST
2011 International Conference on Electronics, Communications and Control, ICECC 2011 - Proceedings | Year: 2011

On the analysis of QoS control mechanism of IMS architecture in 3GPP, this paper proposed a DiffServ-based QoS control mechanism of the IMS network, using MPLS bearing technologies, from the core network and the bearer network to achieve the end to end QoS control of IMS network. © 2011 IEEE.

Han L.,Postgraduate Team 1 ICE | Han L.,Chinese Peoples Liberation Army | Lei Z.,PLAUST
Proceedings of the 2012 International Conference on Industrial Control and Electronics Engineering, ICICEE 2012 | Year: 2012

In the network-centric warfare, the complete battlefield situation information and attack information for weapons can be collected and calculated by multiple sensor platforms, and the results can be distributed to the command and control systems and weapon platforms to complete target attack tasks. Track initiation is the primary problem in multi-source multi-target track processing, correct track initiation can not only reduce the calculation burden of post-processing in multi-target tracking, but also be meaningful to the discovery of interfered interesting target. Centralized algorithm first fuses the raw sensor data, and then starts the track tracing with fused points, weight the clustered sample points to fuse sample points. Clustering could be generalized from the active radar side and the passive radar side. Further more, effects caused by obstacle constraints are also discussed. © 2012 IEEE.

Cheng L.,Postgraduate Team 3 ICE | Chen J.,PLAUST
ICIME 2010 - 2010 2nd IEEE International Conference on Information Management and Engineering | Year: 2010

The Distributed Coordination Function (DCF) of IEEE 802.11 is one of most commonly used MAC protocol in channel-shared wireless network, but it can't support differentiated services among various applications. In this paper, a novel probability back-off MAC protocol is proposed to provide service differentiation as well as enhance the overall system throughput. We analyze our scheme by using a Markov Chain. The simulation results show that our scheme can properly allocate the channel capacity among stations according to different priorities and obtain a better system throughput than IEEE 802.11 DCF, furthermore, it can be adaptive to the alteration (such as proportion of priority classes, number of stations) of network, While any of the other schemes can not. © 2010 IEEE.

2011 International Conference on Electric Information and Control Engineering, ICEICE 2011 - Proceedings | Year: 2011

The performance of phase-coded signals and a phase-coded signal generator based Direct Digital Synthesis(DDS) are presented in this paper. The binary phase coded waveforms are compared with polyphase coded waveforms. The comparison covers the ambiguity and autocorrection function and the simulation results are given. A realization structure of DDS is proposed. Various types of phase-coded waveforms can be easily designed using this structure by define an additional phase sequences. The realization method of other complex signals which are combined of phase-coded signal and step frequency or variable period signals are introduced. © 2011 IEEE.

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