Wei Heng

Southeast University (China), Nan-ching-hsü, Jiangxi Sheng, China

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Publications (7)0 Total impact

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    ABSTRACT: The traffic of wireless networks changes in time and spatial distribution. When the traffic load is low, some base stations (BSs) can be sleep mode even been turned off to improve system energy efficiency, the corresponding traffic can be provided by the rest active base stations. In this paper, firstly, considering users with different locations and Quality of Service (QoS) requirements in actual cellular networks, an energy consumption problem is formulated. Secondly, a mobile station round robin base stations (MSRRBS) access algorithm is presented based on base station sleep mode when the network traffic load is low. At last, the computation complexity analysis is given compared to exhaustive search (ES) method. Simulation results show that, the MSRRBS algorithm can significantly reduce the total energy consumption of the network with low traffic load, meanwhile it almost achieves the nearly same performance with the ES method. Three sleep scenarios are considered, it is shown that the sleep scenario is also crucial for BSs sleep design.
    Communications in China (ICCC), 2013 IEEE/CIC International Conference on; 01/2013
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    ABSTRACT: A tightly coupled air interface is the key technology for the integration of heterogeneous networks. The information interaction between different layers must be considered when the tightly coupled air interface of the integral heterogeneous networks is researched, which is called cross layer design and optimization. The physical layer abstraction algorithm is crucial to cross layer design. This paper discusses the physical layer abstraction algorithm, investigates the physical layer abstraction algorithm based on received bit mutual information rate (RBIR), and applies the algorithm in the integral heterogeneous network for CDMA EVDO and WLAN. Simulation results show that the algorithm can better describe the relation between modulation coding, channel conditions and packet error rate.
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    ABSTRACT: This paper discusses the physical layer abstraction algorithms for the integration of next-generation high-speed wireless local area network (WLAN) based on 802.11n and Long term evolution (LTE) cellular mobile communication network. Both the received bit information rate (RBIR) algorithm and the exponential effective signal-to-noise-ratio (SNR) mapping (EESM) algorithm are compared and analyzed in the heterogeneous network which is the integration of next-generation high-speed WLAN based on 802.11n and LTE cellular mobile communication network, and an appropriate method for the physical layer abstraction (PLA) algorithms selection is proposed by Link Level Simulation (LLS) and comparative analysis.
    Signals Systems and Electronics (ISSSE), 2010 International Symposium on; 10/2010
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    ABSTRACT: Link Adaptation (LA) and Hybrid Automatic Repeat reQuest (HARQ) are seen as effective methods to enhance performance of wireless communications. However, most of them tend to divide LA and HARQ into two independent parts, and optimization has been made in each part respectively. It is obvious that LA promotes efficiency by decreasing robustness of wireless transmissions, while HARQ is just the opposite. So LA and HARQ should be optimized with one unified criterion to make full use of capability of wireless communications. To this question, a unified QoS criterion for LA and HARQ is proposed. Then combined optimization on LA and HARQ is deduced based on this proposed criterion. By placing both the two techniques under one evaluating framework of QoS, LA and HARQ are not optimized independently but synthetically from the view of QoS, and performance gain is achieved. Both theoretical demonstration and simulation results have validated that the proposed optimization will enhance QoS for wireless transmissions.
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    ABSTRACT: In multi-hop relay network, there may be several Relay Nodes(RNs) subordinated to the base station(BS) in a cell. When an user equipment (UE) moves from one cell to another, or an UE moves between two different RNs, a handover will happen. Since the coverage of a relay is small, the handover between two RNs or RN and base station (BS) maybe happen frequently. In terms of whether the UE is located at the same cell, the handover in relay network can be classified into two categories, intra MR-BS handover and inter MR-BS handover. In this paper, we proposed a new handover scheme exploiting uplink signal and downlink signal for intra MR-BS handover with transparent RN. In the scheme, the handover decision is divided into two steps. The first step is based on uplink quality, and the second step based on downlink quality to affirm the first decision. The simulation results show that the proposed handover scheme reduces the handover probability and outage probability compared to the current intra MR-BS handover with transparent RN.
    Wireless Communications & Signal Processing, 2009. WCSP 2009. International Conference on; 12/2009
  • Zhiyi Yin, Wei Heng
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    ABSTRACT: In real-time image processing, a large amount of data is needed to be processed at a very high speed. Considering the problems faced in real-time image processing, a distributed multiprocessor system is proposed in this paper. In the design of the distributed multiprocessor system, processing tasks are allocated to various processes, which are bound to different CPUs. Several designs are discussed, and making full use of every process is very important to system's excellent performance. Furthermore, the problems of realization fasten on the inter-process communication, the synchronization, and the stability. System analysis and performance tests both show that the distributed multiprocessor system is able to improve system's performance variously, including the delay, the throughput rate, the stability, the scalability. And the system can be expanded easy at aspects of software and hardware. In a word, the distributed multiprocessor system designed for real-time image processing, based on distributed algorithms, not only improves system's performance variously, but also costs low and expands easy.
    Proc SPIE 11/2008;
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    ABSTRACT: New frequency domain training sequences are proposed sedfor carrier frequency offset (CFO) estimation in multipleinput multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system over frequency-selective fading channels. By exploiting frequency domain orthogonality of the training sequences, integer CFO (ICFO) can be estimated without matrix inversion operation. With the non-zero pilots in the training sequences uniformly spaced, fractional CFO (FCFO) can be estimated through the roots of a complex polynomial. Moreover, a simplified CFO estimator is also proposed which exploits a geometric mapping to transform the complex polynomial to a real one. Simulation results illustrate the good performances of the CFO estimators assisted by the proposed training sequences.
    Communications, 2006. ICC '06. IEEE International Conference on; 07/2006