Table of Content

    01 October 2016, Volume 14 Issue 4
    Special Topic
    Multiple Access Techniques for 5G
    YUAN Jinhong, XIANG Jiying, DING Zhiguo, YUAN Zhifeng
    2016, 14(4):  1-2. 
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    Evaluation of Preamble Based Channel Estimation for MIMO-FBMC Systems
    Sohail Taheri, Mir Ghoraishi, XIAO Pei, CAO Aijun, GAO Yonghong
    2016, 14(4):  3-10.  doi:10.3969/j.issn.1673-5188.2016.04.001
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    Filter-bank multicarrier (FBMC) with offset quadrature amplitude modulation (OQAM) is a candidate waveform for future wireless communications due to its advantages over orthogonal frequency division multiplexing (OFDM) systems. However, because of or-thogonality in real field and the presence of imaginary intrinsic interference, channel estimation in FBMC is not as straightforward as OFDM systems especially in multiple antenna scenarios. In this paper, we propose a channel estimation method which employs intrinsic interference cancellation at the transmitter side. The simulation results show that this method has less pilot overhead, less peak to average power ratio (PAPR), better bit error rate (BER), and better mean square error (MSE) performance compared to the well-known intrinsic approximation methods (IAM).
    Non-Orthogonal Multiple Access Schemes for 5G
    YAN Chunlin, YUAN Zhifeng, LI Weimin, YUAN Yifei
    2016, 14(4):  11-16.  doi:10.3969/j.issn.1673-5188.2016.04.002
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    Multiple access scheme is one of the key techniques in wireless communication systems. Each generation of wireless communication is featured by a new multiple access scheme from 1G to 4G. In this article we review several non?orthogonal multiple access schemes for 5G. Their principles, advantages and disadvantages are discussed, and followed by a comprehensive comparison of these solutions from the perspective of user overload, receiver type, receiver complexity and so on. We also discuss the application challenges of non?orthogonal multiple access schemes in 5G.
    A Survey of Downlink Non-Orthogonal Multiple Access for 5G Wireless Communication Networks
    WEI Zhiqiang, YUAN Jinhong, Derrick Wing Kwan Ng, Maged Elkashlan, DING Zhiguo
    2016, 14(4):  17-25.  doi:10.3969/j.issn.1673-5188.2016.04.003
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    Non-orthogonal multiple access (NOMA) has been recognized as a promising multiple access technique for the next generation cellular communication networks. In this paper, we first discuss a simple NOMA model with two users served by a single-carrier simultaneously to illustrate its basic principles. Then, a more general model with multicarrier serving an arbitrary number of users on each subcarrier is also discussed. An overview of existing works on performance analysis, resource allocation, and multiple-input multiple-output NOMA are summarized and discussed. Furthermore, we discuss the key features of NOMA and its potential research challenges.
    Unified Framework Towards Flexible Multiple Access Schemes for 5G
    SUN Qi, WANG Sen, HAN Shuangfeng, Chih-Lin I
    2016, 14(4):  26-34.  doi:10.3969/j.issn.1673-5188.2016.04.004
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    Non-orthogonal multiple access (NOMA) schemes have achieved great attention recently and been considered as a crucial component for 5G wireless networks since they can efficiently enhance the spectrum efficiency, support massive connections and potentially reduce access latency via grant free access. In this paper, we introduce the candidate NOMA solutions in 5G networks, comparing the principles, key features, application scenarios, transmitters and receivers, etc. In addition, a unified framework of these multiple access schemes are proposed to improve resource utilization, reduce the cost and support the flexible adaptation of multiple access schemes. Further, flexible multiple access schemes in 5G systems are discussed. They can support diverse deployment scenarios and traffic requirements in 5G. Challenges and future research directions are also highlighted to shed some lights for the standardization in 5G.
    Multiple Access Rateless Network Coding for Machine-to-Machine Communications
    JIAO Jian, Rana Abbas, LI Yonghui, ZHANG Qinyu
    2016, 14(4):  35-41.  doi:10.3969/j.issn.1673-5188.2016.04.005
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    In this paper, we propose a novel multiple access rateless network coding scheme for machine-to-machine (M 2M) communications. The presented scheme is capable of increasing transmission efficiency by reducing occupied time slots yet with high decoding success rates. Unlike existing state-of-the-art distributed rateless coding schemes, the proposed rateless network coding can dynamically recode by using simple yet effective XOR operations, which is suitable for M2M erasure networks. Simulation results and analysis demonstrate that the proposed scheme outperforms the existing distributed rateless network coding schemes in the scenario of M2M multicast network with heterogeneous erasure features.
    Multiple Access Technologies for Cellular M 2M Communications
    Mahyar Shirvanimoghaddam, Sarah J. Johnson
    2016, 14(4):  42-49.  doi:10.3969/j.issn.1673-5188.2016.04.006
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    This paper reviews the multiple access techniques for machine-to-machine (M2M) communications in future wireless cellular networks. M2M communications aims at providing the communication infrastructure for the emerging Internet of Things (IoT), which will revolutionize the way we interact with our surrounding physical environment. We provide an overview of the multiple access strategies and explain their limitations when used for M2M communications. We show the throughput efficiency of different multiple access techniques when used in coordinated and uncoordinated scenarios. Non-orthogonal multiple access (NOMA) is also shown to support a larger number of devices compared to orthogonal multiple access techniques, especially in uncoordinated scenarios. We also detail the issues and challenges of different multiple access techniques to be used for M2M applications in cellular networks.
    Software Defined Optical Networks and Its Innovation Environment
    LI Yajie, ZHAO Yongli, ZHANG Jie, WANG Dajiang, WANG Jiayu
    2016, 14(4):  50-57.  doi:10.3969/j.issn.1673-5188.2016.04.007
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    Software defined optical networks (SDONs) integrate software defined technology with optical communication networks and represent the promising development trend of future optical networks. The key technologies for SDONs include software-defined optical transmission, switching, and networking. The main features include control and transport separation, hardware universalization, protocol standardization, controllable optical network, and flexible optical network applications. This paper introduces software defined optical networks and its innovation environment, in terms of network architecture, protocol extension solution, experiment platform and typical applications. Batch testing has been conducted to evaluate the performance of this SDON testbed. The results show that the SDON testbed has good scalability in different sizes. Meanwhile, we notice that controller output bandwidth has great influence on lightpath setup delay.
    Research Paper
    Depth Enhancement Methods for Centralized Texture-Depth Packing Formats
    YANG Jar-Ferr, WANG Hung-Ming, LIAO Wei-Chen
    2016, 14(4):  58-66.  doi:10.3969/j.issn.1673-5188.2016.04.008
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    To deliver three-dimension (3D) videos through the current two?dimension (2D) broadcasting systems, the frame-compatible packing formats properly including one texture frame and one depth map in various down-sampling ratios have been proposed to achieve the simplest and most effective solution. To enhance the compatible centralized texture-depth packing (CTDP) formats, in this paper, we further introduce two depth enhancement algorithms to further improve the quality of CTDP formats for delivering 3D video services. To compensate the loss of color YCbCr 444 to 420 conversion of colored-depth, two efficient depth reconstruction processes based on texture and depth consistency are proposed. Experimental results show that the proposed enhanced CTDP depacking process outperforms the 2DDP format and the original CTDP depacking procedure in synthesizing virtual views. With the help of the proposed efficient depth reconstruction processes, more correct reconstructed depth maps and better synthesized quality can be achieved. Before the available 3D broadcasting systems, which adopt truly depth and texture dependent coding procedure, we believe that the proposed CTDP formats with depth enhancement could help to deliver 3D videos in the current 2D broadcasting systems simply and efficiently.
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    The whole issue of ZTE Communications October 2016, Vol. 14 No. 4
    2016, 14(4):  0. 
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