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2016年 第14卷 第S1期    刊出日期：2016-12-01

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Multi-Gigabit Millimeter-WaveWireless Communications

ZHANG Yueping, GUAN Ke, WANG Junjun

2016, 14(S1):  1-1. 

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The exponential growth of using wireless devices in recent years has motivated the exploration of the millimeter-wave (mmWave) frequency spectrum for multi-gigabit wireless communications. Recent advances in antenna technology, radio-frequency complementary metal-oxide semi-conductor (RF CMOS) process and high-speed baseband signal processing algorithms have promised the feasibility of millimeter-wave wireless communications. The multi-gigabit-per-second data rate of millimeter-wave wireless communication systems is leading to applications in many important scenarios, such as wireless personal area networks (WPAN), wireless personal area networks (WLAN), back-haul for cellular systems. The frequency bands include 28 GHz, 38 GHz, 45 GHz, 60 GHz, E-BAND, and even beyond 100 GHz.

The special issue aims to present some major achievements of the research and development in multi-gigabit millimeter-wave wireless communications. It includes four technical contributions from leading researchers in mmWave communications. The first paper entitled “Substrate-Integrated Waveguide-Based Monopulse Slot Antenna Arrays for 60 GHz Applications”, co-authored by ZHU, XUE and LIAO, presents the substrate-integrated waveguide (SIW)-based monopulse slot antenna arrays for the application of 60 GHz monopulse tracking systems. The second paper entitled “Millimeter Wave and THz Propagation Channel Modeling for High-Data Rate Railway Connectivity — Status and Open Challenges” is co-authored by Kürner, GUAN, Molisch, AI, HE, LI, TIAN, DOU and ZHONG. In this paper, the authors provide elementary discussions on bandwidth requirements of high-data rate railway connectivity, and highlight the open challenges in terms of wave propagation, static channel, and dynamic channel.

Co-authored by XU, MENG, MA and YEO, the third paper entitled “State of the Art in Passive Bandpass Filter Solutions for 60-GHz Communications”, reviews the state-of-the-art filter designs for 60-GHz applications. Design methodology, design technology, key performance parameters, similarities and differences, advantages and drawbacks, and future trends are explored and studied. The last (but not least) paper “Low-Power High-Efficiency Multi-Gigabit 60 GHz Transceiver Systems Routing in Vehicular Environments” is co-authored by Byeon and Park. It proposes low-power high-efficiency multi-gigabit 60 GHz transceiver systems for short-range communications. The antenna-in-package module with the transceiver demonstrates mobile-to-display 1080p Full-HD video transmission over a distance of 60 cm.

We would like to thank all the authors for choosing this special issue to publish their new research results and insights, all the reviewers for their valuable review comments which help to improve the technical quality and presentation of this special issue, and the editorial official of ZTE Communications for all the support and help during the editorial process of this special issue. We are sure this special issue will again be quite informative and a pleasure for you to browse through and read in depth.

Substrate Integrated Waveguide Based Monopulse Slot Antenna Arrays for 60 GHz Applications

ZHU Jianfeng, XUE Quan, and LIAO Shaowei

2016, 14(S1):  2-6.  doi:DOI:10.3969/j.issn.1673-5188.2016.S1.001

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Monopulse slot antenna arrays based on substrate integrated waveguide (SIW) are proposed for the application of 60 GHz monopulse tracking systems in this paper. The sum-difference monopulse comparator can provide a high amplitude and phase balance over wide frequency band and no phase delay technique is required for the difference channel. Resonant slot antennas are adopted as the radiating elements since they can be integrated with the sum-difference monopulse comparator in a single layer with a compact size. Two monopulse arrays with 2 × 4 and 4 × 4 slot elements are designed, fabricated, and measured. Measured results show that the proposed antenna arrays have wide bandwidth covering the unlicensed 60-GHz band. The peak sum beam gain is 13.85 dBi for the 2 × 4 element array and 16.24 dBi for the 4 × 4 element array. The peak difference beam gain is 11.20 dBi for the 2 × 4 element array and 12.11 dBi for the 4 × 4 element array and the maximum null depth can reach -40 dB.

Millimeter Wave and THz Propagation Channel Modeling for High-Data Rate Railway Connectivity—Status and Open Challenges

Thomas Kürner, GUAN Ke, Andreas F. Molisch, AI Bo, HE Ruisi, LI Guangkai, TIAN Li, DOU Jianwu,and ZHONG Zhangdui

2016, 14(S1):  7-13.  doi:DOI:10.3969/j.issn.1673-5188.2016.S1.002

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In the new era of railways, infrastructure, trains and travelers will be interconnected. In order to realize a seamless high-data rate wireless connectivity, up to dozens of GHz bandwidth is required. This motivates the exploration of the underutilized millimeter wave (mmWave) as well as the largely unexplored THz band. In this paper, we first identify relevant communication scenarios for railway applications. Then the specific challenges and estimates of the bandwidth requirements for high-data rate railway connectivity in these communication scenarios are described. Finally, we outline the major challenges on propagation channel modeling and provide a technical route for further studies.

State of the Art in Passive Bandpass Filter Solutions for 60 GHz Communications

XU Shanshan, MENG Fanyi, MA Kaixue, and YEO Kiat Seng

2016, 14(S1):  14-19.  doi:DOI:10.3969/j.issn.1673-5188.2016.S1.003

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This paper reviews the state-of-the-art filter designs for 60 GHz applications. The most promising filter solutions at this frequency include filter-in-package where the filter itself is design in the packaging platform and filter-on-chip which is an on-chip filter codesign for miniaturized system size with low packaging cost. Design methodology, design technology, key performance parameters, similarities and differences, advantages and drawbacks, and future trends are explored and studied. Filters in the printed circuit board (PCB), low temperature co-fired ceramics (LTCC), organic material, and bipolar complementary metal oxide semiconductor (BiCMOS) chips are summarized and compared in details. Future design trends and challenges are also given after the review.

Low-Power High-Efficiency Multi-Gigabit 60 GHz Transceiver Systems Routing in Vehicular Environments

Chul Woo Byeon and Chul Soon Park

2016, 14(S1):  20-24.  doi:DOI:10.3969/j.issn.1673-5188.2016.S1.004

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This paper proposes low-power high-efficiency multi-gigabit 60 GHz transceiver systems for short-range communications. 60 GHz multi-gigabit on-off keying (OOK) receiver system-in-package (SiP) module is developed using a low temperature co-fired ceramic (LTCC) technology. Integrated with a low-power complementary metal oxide semiconductor (CMOS) OOK demodulator, the LTCC receiver module demonstrates Full-HD uncompressed video streaming at a distance of 1 m. A low-power and high-efficiency fully integrated OOK transceiver is also developed to be integrated in a handheld device. The transceiver consumes 67 mW at 10.7 Gb/ s and occupies an active footprint of 0.44 mm2. With an on-board Yagi-Uda antenna, the transceiver achieves 10.7 Gb/s of data transmission, resulting in a high energy efficiency of 6.26 pJ/bit. The antenna-in-package module with the transceiver demonstrates mobile-to-display 1080p Full-HD video transmission over a distance of 60 cm.

Current Situation and Development of Intelligence Robots

REN Fuji and SUN Xiao

2016, 14(S1):  25-34.  doi:DOI:10.3969/j.issn.1673-5188.2016.S1.005

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Industrial intelligent robots are treated as a measure of national scientific level and technology innovation, and also the important symbol of high-level manufacturing, while service intelligent robots can directly affect people’s daily lives. The development of artificial robots in different areas is attracting much attention around the world. This article reviews the current situation and development of Chinese and international intelligent robot markets including industrial robots and service robots. The intelligent robot technology and the classification of robots are also discussed. Finally, applications of intelligent robots in various fields are concluded and the development trends and outlook of intelligent robots are explored.

An Optimization of HTTP/2 for Mobile Applications

DONG Zhenjiang, SHUANG Kai, CAI Yanan, WANG Wei, and LI Congbing

2016, 14(S1):  35-42.  doi:DOI:10.3969/j.issn.1673-5188.2016.S1.006

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In recent years, Hyper Text Transfer Protocol (HTTP) spreads quickly and steadily in the usage of mobile applications as a common web protocol, so that the mobile applications can also benefit from HTTP/2, which is the new version of HTTP based on SPDY developed by Google to speed up the Internet transmission speed. HTTP/2 enables a more efficient use of network resources and a reduced perception of latency by introducing header field compression and allowing multiple concurrent exchanges on the same connection. However, what HTTP/2 focuses on is visiting websites through a browser, and mobile applications are not considered much. In this paper, firstly, mobile applications are classified based on the data flow characteristics. Based on the classification, we propose an optimization of HTTP/2 for mobile applications, called HTTP/2-Advance, which uses multiple Transmission Control Protocol (TCP) connections to multiplex HTTP requests and responses. Then we build a tiny system which simulates actual requests and responses between mobile applications and servers. We figure out the best choice of the number of multiple TCP connections for mobile applications, and compare the performance of HTTP, HTTP/2 and HTTP/2-Advance in both simulated and in-situ experiments in our system.

One Step Hologram Calculation for Holographic 3D Display Based on Nonuniform Sampled Angular Spectrum Method

CHANG Chenliang, XIA Jun, and LEI Wei

2016, 14(S1):  43-47.  doi:DOI:10.3969/j.issn.1673-5188.2016.S1.007

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We proposed a method for calculating the computer generated hologram from multi-plane 3D objects by using nonuniform sampled angular spectrum method (NUASM). Both of the hologram plane and the image plane are nonuniform sampled according to the distances and positions of the three-dimensional objects. The nonuniform fast Fourier transform (NUFFT) is used to calculate the angular spectrum propagation from the image plane to the hologram plane and the hologram can be calculated in only one step. Simulation and optical experiment results show that the hologram generated in this way can reconstruct objects on multi - planes simultaneously and separately without axial distortion.

Research on Interference Cancellation for Switched-on Small Cells in Ultra Dense Network

SUN Yang, CHANG Yongyu, WANG Chao, ZHANG Lu, ZHANG Yu, and WANG Xinhui

2016, 14(S1):  48-53.  doi:DOI:10.3969/j.issn.1673-5188.2016.S1.009

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In ultra-dense heterogeneous networks, the co-channel interference between small cells turns to be the major challenge to cell throughput improvement, especially for cell edge users. In this paper, we propose a distributed frequency resource allocation approach for interference cancellation, which allocates appropriate frequency resources when a small cell is switched on to reduce the co-channel interference to its neighboring small cells. This frequency resource pre - allocation aims at avoiding co-channel interference between small cells and improving users’throughput. The simulation results show that our proposed scheme can effectively reduce the co-channel interference and achieve considerable gains in users’ throughput.

Action Recognition in Surveillance Videos with Combined Deep Network Models

ZHANG Diankai, ZHAO Rui-Wei, SHEN Lin, CHEN Shaoxiang, SUN Zhenfeng, and JIANG Yu-Gang

2016, 14(S1):  54-60.  doi:DOI:10.3969/j.issn.1673-5188.2016.S1.008

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Action recognition is an important topic in computer vision. Recently, deep learning technologies have been successfully used in lots of applications including video data for sloving recognition problems. However, most existing deep learning based recognition frameworks are not optimized for action in the surveillance videos. In this paper, we propose a novel method to deal with the recognition of different types of actions in outdoor surveillance videos. The proposed method first introduces motion compensation to improve the detection of human target. Then, it uses three different types of deep models with single and sequenced images as inputs for the recognition of different types of actions. Finally, predictions from different models are fused with a linear model. Experimental results show that the proposed method works well on the real surveillance videos.

The whole issue of ZTE Communications December 2016, Vol. 14 S1

2016, 14(S1):  0. 

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