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Xplore Articles related to Ieee 802.11ax Standard

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Design power amplifier using load pull method in WLAN 802.11 ax access point application

2017 International Symposium on Electronics and Smart Devices (ISESD), 2017

WLAN is a widely used standard telecommunication protocol. Currently IEEE802.11ac standard has some limitations along with the increasing need for fast communication and able to serve many devices. The development of the IEEE 802.11ax standard is expected to overcome these limitations. Some challenges on the design of power amplifiers also appear as the development of 802.11ax standard. Power amplifiers on ...


How much can we reuse? An empirical analysis of the performance benefits achieved by spatial-reuse of IEEE 802.11ax

2019 11th International Conference on Communication Systems & Networks (COMSNETS), 2019

The IEEE 802.11ax standard is the latest innovation in WiFi, also referred to as WiFi 6 (sixth generation). It focuses on improving the performance in dense Wireless Local Area Networks (WLAN). It proposes various features to improve the same. OFDMA, spatial-reuse, and Downlink and Uplink MUMIMO are the most important features introduced. In this paper, we focus on the spatial-reuse ...


Identifying signal source using channel state information in wireless LANs

2018 International Conference on Information Networking (ICOIN), 2018

In this paper, we study the feasibility of identifying signal source in wireless LANs using channel state information obtained from preambles. In current standard, the signal source can be identified by reading the MAC header which requires high SNR and takes more time than receiving the preamble. For each packet, CSI is obtained for each (group of) subcarriers and for ...


In-frame querying to utilize full duplex communication in IEEE 802.11ax

2015 IEEE Conference on Standards for Communications and Networking (CSCN), 2015

The IEEE 802.11 standard based Wireless Local Area Networks (WLAN) is the most popular and widely deployed communication protocol in the world. It is anticipated that WLAN will drive the future communication systems in order to provide more data rate for more users. IEEE 802.11ax is one of the most promising and advanced standards among the drafts. Full duplex radio ...


On Performance Evaluation of Dynamic Sensitivity Control Techniques in Next-Generation WLANs

IEEE Systems Journal, 2019

Dynamically adapting carrier sensing range, also known as dynamic sensitivity control (DSC), could be an attractive proposition for improving the spatial reuse in dense wireless local area networks. This paper shows the promise and pitfalls of a DSC technique proposed in the IEEE 802.11ax standard and highlights a solution to mitigate these issues. An analytical framework is also presented for ...


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Educational Resources on Ieee 802.11ax Standard

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IEEE-USA E-Books

  • Design power amplifier using load pull method in WLAN 802.11 ax access point application

    WLAN is a widely used standard telecommunication protocol. Currently IEEE802.11ac standard has some limitations along with the increasing need for fast communication and able to serve many devices. The development of the IEEE 802.11ax standard is expected to overcome these limitations. Some challenges on the design of power amplifiers also appear as the development of 802.11ax standard. Power amplifiers on the access point are expected to provide a minimum output of 30dBm. This paper explains the design and modeling of power amplifiers on access point using load pull method. Based on the design and test result using CGH27030 transistor with simulation approach harmonic balance obtained that the output power of half wave obtained optimum value 33,023 dBm at input value 19 dBm and EVM equal to 4,8%.

  • How much can we reuse? An empirical analysis of the performance benefits achieved by spatial-reuse of IEEE 802.11ax

    The IEEE 802.11ax standard is the latest innovation in WiFi, also referred to as WiFi 6 (sixth generation). It focuses on improving the performance in dense Wireless Local Area Networks (WLAN). It proposes various features to improve the same. OFDMA, spatial-reuse, and Downlink and Uplink MUMIMO are the most important features introduced. In this paper, we focus on the spatial-reuse feature. The standard proposes OBSS (Overlapping Basic Service Set) colouring to increase spatial reuse in dense scenarios. We evaluate the expected performance benefits offered by the spatial reuse technique. We have used ns-3 to simulate a variety of real networks and examine the performance of the proposed reuse technique. We show that spatial-reuse capabilities help achieve significant performance benefits for various network types under certain configurations of Clear Channel Assessment (CCA) threshold, inter-AP distance and power. These results shall act as a reference point for future testing to take place before eventual deployment.

  • Identifying signal source using channel state information in wireless LANs

    In this paper, we study the feasibility of identifying signal source in wireless LANs using channel state information obtained from preambles. In current standard, the signal source can be identified by reading the MAC header which requires high SNR and takes more time than receiving the preamble. For each packet, CSI is obtained for each (group of) subcarriers and for each TX-RX path, which makes the information rich in features to be used for machine learning-based classification. Experiments in a typical office environment show that with simple kNN or neural network models, we can classify tens of signal sources with over 90% accuracy. Moreover, confidence levels differ significantly between correct and incorrect samples, which can be exploited to avoid false positives with little sacrifice of correct samples. The CSI-based source identification method can be used to improve spectral efficiency of WLANs, and can be used along with schemes such as BSS coloring included in the IEEE 802.11ax standard for highly efficiency WLANs.

  • In-frame querying to utilize full duplex communication in IEEE 802.11ax

    The IEEE 802.11 standard based Wireless Local Area Networks (WLAN) is the most popular and widely deployed communication protocol in the world. It is anticipated that WLAN will drive the future communication systems in order to provide more data rate for more users. IEEE 802.11ax is one of the most promising and advanced standards among the drafts. Full duplex radio with self-interference cancellation is highly anticipated to be incorporated into IEEE 802.11ax standard. However, according to the empirical study of WLAN usage patterns showing extreme unbalance between uplink and downlink traffic, there may be plenty of wasted opportunities that naive full duplex MAC protocols cannot utilize. To extend those opportunities, we develop In-frame Querying method to instantly find the candidate stations which are able to support the full duplex capability with AP. We conduct computer simulations to evaluate the performance gain of In-frame Querying method for full duplex communication in IEEE 802.11ax. Our results show that In-frame Querying is a simple and robust scheme to improve the throughput significantly compared to the legacy methods in WLAN.

  • On Performance Evaluation of Dynamic Sensitivity Control Techniques in Next-Generation WLANs

    Dynamically adapting carrier sensing range, also known as dynamic sensitivity control (DSC), could be an attractive proposition for improving the spatial reuse in dense wireless local area networks. This paper shows the promise and pitfalls of a DSC technique proposed in the IEEE 802.11ax standard and highlights a solution to mitigate these issues. An analytical framework is also presented for the performance evaluation of DSC techniques.

  • Analysis of Inversely Proportional Carrier Sense Threshold and Transmission Power Setting Based on Received Power for IEEE 802.11ax

    In this study, we conducted an analysis of the system performance of a wireless local area network in which access points (APs) dynamically adjust the carrier sense threshold (CST) based on the individual average received power to determine the optimal CST. Adjustment of the CST is a promising approach to improve spatial reuse and proposed for IEEE 802.11ax standard. Here, assuming to adopt the inversely proportional setting of the CST and transmission power, we can make the carrier sensing relationship symmetric, restraining throughput starvation. This paper analytically derives the density of successful transmissions (DST) on the basis of stochastic geometry. The DST is a system performance metric which expresses the number of APs whose transmission is successful based on signal-to-interference-plus-noise power ratio. We show that both results of the analytically derived DST and Monte Carlo simulation have the same trend. From the perspective of the derived DST, the optimal parameter setting is also discussed.

  • QoS Evaluation of the Future High-Efficiency IEEE 802.11ax WLAN Standard

    Nowadays, the development of new wireless protocols and standards are an engineering challenge due to the increased demand of Internet services via wireless access networks. Incoming standards, such as the IEEE 802.11ax, aim to improve the availability and performance of the wireless local area networks (WLAN). Recent works related to the development of the IEEE 802.11ax standard are focused on the description and initial performance evaluations of the expected technical improvements; however, there is no evaluation available regarding the QoS improvements that can be achieved with the new features included in the standard. In this work, we present a qualitative evaluation, as well as a set of laboratory and emulation tests aiming to compare current WLAN networks (IEEE 802.11g/n/ac) with the future IEEE 802.11ax networks. Datasets from real wireless scenarios are collected to evaluate QoS metrics in current IEEE 802.11g networks, and the IEEE 802.11ax standard is evaluated via emulation in NS3 with the injection of the same datasets, considering there are no deployments available with the new standard to date. Results show a significant improvement in terms of effective transfer rate (throughput) and round-trip-time (RTT) for the future WLAN networks, which is in line with the huge potential expected with the introduction of the upcoming high efficiency IEEE 802.11ax standard.

  • Scheduling and Resource Allocation in 802.11ax

    802.11ax introduces OFDMA to WiFi. It thus enables multiplexing users/user groups in the frequency domain. WiFi networks usually operate in a multipath environment which generates a frequency selective channel. Hence, the capacity of a user/user group changes over different subcarriers. A good scheduling and resource allocation scheme can maximize the sum rate by allocating users and user groups on subcarriers based on their CSI and other system considerations. In this paper we investigate how to optimally assign users and user groups to subcarriers with the goal of maximizing the user sum rate in the context of 802.11ax. We introduce a novel divide and conquer based algorithm which we prove to be optimal under the assumption that a user can be assigned to more than one resource unit (RU) which consists of one ore more subcarriers. This serves as a tight upper bound on the actual problem where users/user groups can be assigned to a single RU only per the 802.11ax standard. We then introduce two practical algorithms for the actual problem, a greedy one and a recursive one which jointly splits the bandwidth into RUs and schedules users on them. Extensive simulations comparing the performance of the aforementioned algorithms establish that our practical schemes achieve very good performance in all studied scenarios.

  • WLAN throughput management: A game theoretic TXOP scheduling approach

    This paper investigates the dynamic selection of transmission opportunity (TXOP) which was originally proposed in IEEE 802.11e Enhanced Distributed Channel Access (EDCA). A game theoretic optimisation framework is proposed to schedule the optimal TXOP value for every station according to the current channel capacity and transmission requirements of the stations, in order to improve the efficiency of TXOP scheduling and channel resource utilisation. The advantages of the proposed decentralised mechanism include the increased flexibility in TXOP allocation and the reduced complexity. The proposed mechanism has potential applications in the future IEEE 802.11ax standard. Theoretical study shows the existence of Nash equilibrium where the stations achieve an optimal TXOP scheduling. Numerical simulations are presented to demonstrate the proposed framework.



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