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Miniaturized band-notched UWB MIMO antenna with high isolation

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2016年第4期58卷 878-881页

作者： Kang, Le Li, Hui Wang, Xin-Huai Shi, Xiao-Wei Xidian Univ Sci & Technol Antenna & Microwave Lab Xian 710071 Shaanxi Peoples R China

A compact multiple-input multiple-output (MIMO) antenna is presented for band-notched ultra-wideband (UWB) applications. Miniaturization of the proposed antenna is realized by employing the asymmetric coplanar strip (ACS)-fed structures. To obtain the band-notched function, open stubs are introduced on the radiators. In addition, an H-shaped slot is etched on the ground to reduce the mutual coupling between the antenna elements. The designed antenna with an overall size of 28 x 22 x 0.8 mm(3) was fabricated and tested. Measured results show the antenna operates over a frequency band of 2.9-11.8 GHz with reflection coefficient less than -10 dB, except at the rejection band of 4.9-6 GHz. Within the operating band, measured port isolation is better than 20 dB. Radiation characteristics and diversity performance of the antenna are also investigated through measurement. (c) 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:878-881, 2016

关键词： band-notched isolation enhancement multiple-input-multiple-output ultra-wideband antenna

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Frequency-Domain Iterative SDFE for MIMO-OFDM Systems

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WIRELESS PERSONAL COMMUNICATIONS 2016年第3期86卷 1121-1140页

作者： Chung, Chi-Yang Ueng, Fang-Biau Chang, Yu-Kuan Natl Chung Hsing Univ Dept Elect Engn Taichung 40227 Taiwan

This paper proposes a frequency-domain iterative soft decision feedback equalization (SDFE) scheme for multiple-input-multiple-output orthogonal frequency division multiplexing communication systems in multi-path fading channels. Error propagation can seriously affect the performance of the adaptive decision feedback equalization. We propose an iterative SDFE to not only combat error propagation but also be suitable for multilevel modulation systems. Under a Gaussian approximation of the a priori information and the SDFE output, the output of an equivalent AWGN channel and expressions for the a posteriori log likelihood ratio (LLR) and the extrinsic LLR are derived for multilevel modulation. In addition, we also investigate the iterative receivers by employing irregular low-density parity check codes (LDPC) and turbo codes. The performance of the LDPC-coded iterative receiver is better than that of the turbo-coded iterative receiver. Some simulation examples are given to show the effectiveness and comparisons of the proposed receiver.

关键词： multiple-input-multiple-output Soft decision feedback equalization Turbo equalization

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An ultrawideband antenna for portable MIMO terminals

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2016年第1期58卷 51-56页

作者： Wani, Zamir Vishwakarma, Dinesh Kumar Indian Inst Informat Technol Design & Mfg Jabalpur 482005 Madhya Pradesh India

A compact printed ultrawideband (UWB) antenna system used to combat multipath fading has been proposed and investigated. The antenna consisting of two shovel-shaped monopole antenna elements (AE) on a low loss substrate with dimensions 35 x 30 mm(2) can be used for multi-input-multi-output (MIMO)/diversity applications. Both the monopole antennas are fed with microstrip lines, matched to 50 lines at each port. To reduce the mutual coupling, two F-shaped ground stubs are added to the ground plane and rectangular slots have been made to ensure proper impedance matching. Measured and simulated results show that the antenna system covers most of UWB with isolation greater than 22 dB. A low value of measured envelops correlation coefficient less than 0.005 is achieved throughout the entire band of interest (3.1-10.6 GHz). The proposed antenna satisfies all the requirements of an MIMO antenna used for UWB, thus is a potential candidate for MIMO/diversity applications in UWB communication. (c) 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:51-56, 2016

关键词： diversity envelope correlation coefficient ground stub isolation multiple-input-multiple-output ultrawideband

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A compact four elements UWB MIMO antenna with on-demand WLAN rejection

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2016年第2期58卷 270-276页

作者： Khan, Saeed M. Iftikhar, Adnan Asif, Sajid M. Capobianco, Antonio-Daniele Braaten, Benjamin D. Univ Padua Dipartimento Ingn Informaz I-35131 Padua Italy N Dakota State Univ Dept Elect & Comp Engn Fargo ND 58102 USA COMSATS Inst Informat Technol Dept Elect & Comp Engn Islamabad Pakistan

This article presents a four elements frequency reconfigurable ultrawideband (UWB) multiple-input-multiple-output (MIMO) design, capable of rejecting on-demand WLAN band ranging from 4.8 to 6.2 GHz. The proposed design consists of two U-shaped monopole UWB radiators and two circular slotted-monopole radiators. These monopole radiators are placed orthogonally with respect to each other to exploit polarization diversity, whereas the PIN diodes are used to connect the band-stop design with the ground plane to introduce the on-demand band rejection feature. An isolation of better than 17 dB between the four UWB-MIMO elements is achieved in the 2.7-12 GHz frequency range for the both PIN diodes biased and unbiased states. The simulations and measurements results showed good agreement over the band of interest. (c) 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:270-276, 2016

关键词： multiple-input-multiple-output ultrawideband envelope correlation co-efficient on-demand band rejection

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Compact CPW UWB diversity slot antenna with dual band-notched characteristics

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2016年第4期58卷 989-994页

作者： Zhu, Jianfeng Feng, Botao Peng, Biao Li, Shufang Deng, Li Beijing Univ Posts & Telecommun Beijing Key Lab Network Syst Architecture & Conve Beijing 100876 Peoples R China Shenzhen Univ Coll Elect Sci & Technol Shenzhen 518060 Peoples R China

A compact coplanar waveguide (CPW) fed ultrawideband (UWB) slot antenna for multiple-input-multiple-output (MIMO)/diversity applications is presented in this letter. The antenna consists of two coplanar waveguides (CPWs) feeding circular radiating elements and a protruded stub, which is placed at between them. The circular radiating elements are arrange orthogonally and fed perpendicularly to obtain polarization diversity. Notched band at X-band communication downlinks is achieved by etching split ring resonator slots in the radiators and the other notched band at WLAN system is achieved by the collaboration of arc-shaped strips and the protruded stub. The protruded stub not only can help to achieve band rejection but also can reduce mutual coupling between two ports. As all of the structures are printed in one layer, it can be very easily to be integrated with RF front-end circuits. Simulated and measured results show that the proposed antenna meets the 10-dB impedance bandwidth from 3.4 to 12 GHz and isolation better than 15 dB at most of the band. Good diversity performance in terms of envelope correlation coefficient and the ratio of mean effective gain demonstrates that the antenna is quite suitable for MIMO UWB applications. (c) 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:989-994, 2016

关键词： multiple-input-multiple-output polarization diversity band rejection ultra-wideband

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Spatial Degrees of Freedom for MIMO Interference Channel with Local Channel State Information at Transmitters

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WIRELESS PERSONAL COMMUNICATIONS 2016年第2期89卷 639-662页

作者： Peng, Shixin Liu, Yingzhuang Kong, Zhengmin Lv, Wei Hunan Elect Power Corp State Grid Informat & Commun Co Changsha Hunan Peoples R China Huazhong Univ Sci & Technol Dept Elect & Informat Engn Wuhan Natl Lab Optoelect Wuhan Peoples R China Wuhan Univ Automat Dept Wuhan Peoples R China Air Force Early Warning Acedemy Wuhan Peoples R China

This paper discusses inner bound and outer bound for the total number of spatial degrees of freedom (DoF) of the K-user MIMO interference channel with only local channel state information at each transmitter when channel extensions are disabled over time and frequency dimensions. We firstly provide a constructive proof of the achievability of the DoF based on zero forcing for two-user MIMO interference channel with antennas at transmitter 1, 2 and antennas at the corresponding receivers when only local channel state information (CSI) is available at the transmitters. Then the total achievable DoF and interference management scheme for 3-user interference channel with specific antenna configuration is presented by comparing the number of equations and the number of variables. We apply interference zero-forcing scheme and signal subspace analysis on the generalization of the interference management for this special case to the common 3-user and K-user MIMO symmetric interference channel and establish that the the inner bound on total spatial DoF is achievable in K-user MIMO symmetric interference channel with transmitter antennas and receiver antennas. We also provide the proof of an outer bound on spatial DoF for the K-user MIMO symmetric interference channel with only local CSI at each transmitter and indicate that the inner bound and outer bound are tight when the number of receiver antennas is not less than the number of transmitter antennas.

关键词： Local channel state information Degrees of freedom Interference channel multiple-input-multiple-output Interference zero-forcing

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A Four-Port MIMO Antenna Using Concentric Square-Ring Patches Loaded With CSRR for High Isolation

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IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS 2016年 15卷 1196-1199页

作者： Ramachandran, Anitha Pushpakaran, Sarin Valiyaveettil Pezholil, Mohanan van Kesavath, Vasude Cochin Univ Sci & Technol Dept Elect Ctr Res Electromagnet & Antennas CREMA Cochin 682022 Kerala India Govt Coll Dept Elect Chittur 678104 Palakkad India

A novel four-port multiple-input multiple-output (MIMO) antenna system is designed using concentric square-ring patch antennas. All four ports are made to resonate at 2.4 GHz ISM band with an overall system dimension of 60 x 60 x 1.6 mm(3). This design uses complementary split-ring resonator (CSRR) loaded on its ground plane for enhanced isolation of 22 dB between patch antenna elements. CSRR reduces mutual coupling by about 6.5 dB. The antenna operates with a 2:1 VSWR bandwidth of 75 MHz centered at 2.45 GHz. This collocated antenna system satisfies MIMO diversity performance with low envelope correlation between its waveforms. The effectiveness of concentric rings in MIMO design along with proposed isolation enhancement technique is validated using measurements from a prototype.

关键词： Angle diversity complementary split-ring resonator correlation coefficient multiple-input-multiple-output mutual coupling polarization diversity square ring

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Four element half circle shape printed mimo antenna

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2016年第12期58卷 2990-2992页

作者： Hassan, A. T. Sharawi, M. S. King Fahd Univ Petr & Minerals Dept Elect Engn Dhahran 31261 Saudi Arabia

In this work, a four element multiple-input-multiple-output (MIMO) antenna system with half circle shape printed monopole antennas is presented. The antenna elements are designed on an FR4 substrate with dielectric constant 4.3 and dimensions of 110 x 60 x 0.8 mm(3). These antennas are covering part of 4G and WLAN bands with maximum measured gain and efficiency of 3.12 dB and 81.5%, respectively, along with a -10 dB bandwidth of 230 MHz. The coupling between adjacent ports is at least -11 dB without using any technique for isolation enhancement. The MIMO antenna system has good pattern isolation such that the correlation coefficient is calculated using the measured three-dimensional (3D) far field radiation pattern with a maximum value of 0.3 at 2.4 GHz. The proposed design can be used in handheld terminals. (c) 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2990-2992, 2016

关键词： multiple-input-multiple-output printed monopole correlation coefficient (3D) far field radiation pattern 4G

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Low-Complexity Signal Vector Based Detection Algorithm for Spatial Modulation

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INTERNATIONAL JOURNAL OF FUTURE GENERATION COMMUNICATION AND NETWORKING 2016年第2期9卷 257-268页

作者： Jiang, Yang Wen, Jiejun Wang, Yuanlu Li, Yibo Chongqing Univ Sch Commun Engn Chongqing 630044 Peoples R China

In this paper, signal vector based detection (SVD) algorithm for spatial modulation (SM) is modified to achieve a near maximum-likelihood (ML) performance and reduces the complexity compared to ML. First, the proposed low-complexity SVD (LC-SVD) algorithm orders the antenna index list based on the angle between the received vector y and the channel vector h(j), and then it estimates symbol by compensating the channel attenuation with transmitting antenna index list. We can trade-off between the performance and the complexity by changing the number of the candidate transmitting antennas. The theoretical analysis and simulation results show that the LC-SVD algorithm can achieve a near-ML performance with lower complexity.

关键词： Spatial modulation Complexity SVD multiple-input-multiple-output

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On Full-Duplex Communication in Cooperative Cognitive Radio Networks

On Full-Duplex Communication in Cooperative Cognitive Radio ...

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International Conference on Computational Science and Computational Intelligence (CSIC)

作者： Lee, Seungwon Park, Sangwoo Song, Iickho Zhang, Yalei Nguyen, Mai T. P. Korea Adv Inst Sci & Technol Daejeon 34141 South Korea

ISBN: (纸本)9781509055104

Taking a full-duplex (FD) technique into account, a design of cooperative cognitive radio networks (CCRN) is addressed. The FD communication in the CCRN is enabled by employing simultaneous transmitting and receiving antennas for the secondary users. From the preliminary results via numerical evaluation, it is expected that the proposed FD multiple-input-multiple-output CCRN framework can provide a performance gain over the conventional CCRN frameworks.

关键词： Beamforming spectrum sharing full-duplex multiple-input-multiple-output simultaneous transmission and reception

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