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Start date: 2010End date: 2019Type: search.filters.itemtype.Conference PaperHas files: NoAuthor: search.filters.author.Kocak, TaskinAuthor: search.filters.author.Zhu, Xiaoyi

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    On the performance of IEEE 802.15.3c millimeter-wave WPANs: PHY and MAC
    (2010) Zhu, Xiaoyi; Doufexi, Angela; Kocak, Taskin; Zhu, Xiaoyi, Department of Electrical and Electronic Engineering, University of Bristol, Bristol, United Kingdom; Doufexi, Angela, Department of Electrical and Electronic Engineering, University of Bristol, Bristol, United Kingdom; Kocak, Taskin, Department of Electrical and Electronic Engineering, University of Bristol, Bristol, United Kingdom, Department of Computer Engineering, Bahçeşehir Üniversitesi, Istanbul, Turkey
    The large amount of unlicensed bandwidth available in the millimeter-wave has enabled very high data rate wireless applications. The IEEE 802.15 Task Group 3c has completed standardization efforts for multi-gigabit data rate communications on both the physical (PHY) and medium access control (MAC) layers. This paper presents a performance evaluation of the PHY and MAC layers of the newly published standard. Packet error rate (PER) and PHY throughput are simulated for different modes based on a typical 60 GHz channel model. The theoretical MAC throughput is calculated for different packet sizes and modes under different link conditions. The link adaptation mechanism is used to analyze the operating range versus data rate. The results show that very high data rates can be achieved over low distances. © 2010 IEEE. © 2010 Elsevier B.V., All rights reserved.
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    Beamforming performance analysis for OFDM based IEEE 802.11ad millimeter-wave WPANs
    (2011) Zhu, Xiaoyi; Doufexi, Angela; Kocak, Taskin; Zhu, Xiaoyi, Department of Electrical and Electronic Engineering, University of Bristol, Bristol, United Kingdom; Doufexi, Angela, Department of Electrical and Electronic Engineering, University of Bristol, Bristol, United Kingdom; Kocak, Taskin, Department of Computer Engineering, Bahçeşehir Üniversitesi, Istanbul, Turkey
    This paper exploits the performance of three types of beamforming techniques over the 60 GHz orthogonal frequency division multiplexing (OFDM) based wireless personal area networks (WPANs). The effective SNR over typical IEEE 802.11ad channel models is used as the criterion to compare the beamforming performance. Symbol-wise beamforming reduces the complexity considerably compared to subcarrier-wise beamforming with some performance loss, while hybrid beamforming provides much less performance degradation at a reasonable cost. In order to verify the results, the bit error rate (BER) performance is simulated. In addition, the system throughput over range is presented in the paper. © 2011 IEEE. © 2013 Elsevier B.V., All rights reserved.
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    A performance evaluation of 60 GHz MIMO systems for IEEE 802.11ad WPANs
    (2011) Zhu, Xiaoyi; Doufexi, Angela; Kocak, Taskin; Zhu, Xiaoyi, Department of Electrical and Electronic Engineering, University of Bristol, Bristol, United Kingdom; Doufexi, Angela, Department of Electrical and Electronic Engineering, University of Bristol, Bristol, United Kingdom; Kocak, Taskin, Department of Computer Engineering, Bahçeşehir Üniversitesi, Istanbul, Turkey
    The IEEE 802.11ad task group has published its first draft to cope with the characteristics in 60 GHz millimeter-wave (mmWave) wireless communications. In this paper, three different 2x2 multiple-input multiple-output (MIMO) techniques are considered to enhance the performance of 60 GHz wireless personal networks (WPANs). Packet Error Rate (PER) and link throughput performance are simulated under different channel conditions. In addition, the system throughput over operation range is presented in the paper. Results show that significant enhancements in both coverage and capacity can be achieved by employing space-time block codes (STBC), spatial multiplexing (SM) and three different configurations of beamforming. © 2011 IEEE. © 2012 Elsevier B.V., All rights reserved.
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    A performance enhancement for 60 GHz wireless indoor applications
    (2012) Zhu, Xiaoyi; Doufexi, Angela; Kocak, Taskin; Zhu, Xiaoyi, University of Bristol, Bristol, United Kingdom; Doufexi, Angela, University of Bristol, Bristol, United Kingdom; Kocak, Taskin, Bahçeşehir Üniversitesi, Istanbul, Turkey
    This paper studies the throughput and range of the OFDM based IEEE 802.11ad millimeter-wave WPANs. The cross layer results show that the MIMO and beamforming schemes with frame aggregation and block acknowledgement enhance the throughput and operation range compared to the case of single antenna with reasonable hardware complexity. © 2012 IEEE. © 2012 Elsevier B.V., All rights reserved.
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    Location-aided multi-user beamforming for 60 GHz WPAN systems
    (2012) Han, Congzheng; Zhu, Xiaoyi; Doufexi, Angela; Kocak, Taskin; Han, Congzheng, Department of Electrical and Electronic Engineering, University of Bristol, Bristol, United Kingdom; Zhu, Xiaoyi, Department of Electrical and Electronic Engineering, University of Bristol, Bristol, United Kingdom; Doufexi, Angela, Department of Electrical and Electronic Engineering, University of Bristol, Bristol, United Kingdom; Kocak, Taskin, Department of Computer Engineering, Bahçeşehir Üniversitesi, Istanbul, Turkey
    60 GHz wireless personal area networks (WPANs) offer multi-Gbps throughput, which will provide for a new wave of high data rate applications. This paper exploits the use of location information to improve the performance and enhance range of 60 GHz multi-user beamforming systems. When the location information is available at the transmitter, the scheduler chooses a set of maximum angularly separated users to share wireless resources simultaneously. If additional feedback of signal-to-interference and noise ratio (SINR) is known, a location-assisted scheduler is employed to increase the system overall performance. Both numerical and simulated results show that significant enhancement can be achieved by the proposed schedulers for 60 GHz WPAN systems. © 2012 IEEE. © 2012 Elsevier B.V., All rights reserved.