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Journal articles on the topic 'MOBILE WIMAX SYSTEMS'

Author: Grafiati

Published: 11 September 2023

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1

Kim, Cheong-Hwan, Dae-Seung Ban, and Yong-Hwan Lee. "Channel estimation in mobile WiMAX systems." International Conference on Electrical Engineering 6, no. 6 (May 1, 2008): 1–13. http://dx.doi.org/10.21608/iceeng.2008.34233.

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2

Wang, Fan, Amitava Ghosh, Chandy Sankaran, Philip Fleming, Frank Hsieh, and Stanley Benes. "Mobile WiMAX systems: performance and evolution." IEEE Communications Magazine 46, no. 10 (October 2008): 41–49. http://dx.doi.org/10.1109/mcom.2008.4644118.

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3

Emara, Tamer Z. "Maximizing Power Saving for VoIP over WiMAX Systems." International Journal of Mobile Computing and Multimedia Communications 7, no. 1 (January 2016): 32–40. http://dx.doi.org/10.4018/ijmcmc.2016010103.

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The voice-over-Internet protocol (VoIP) service is expected to be widely supported in wireless mobile networks. Mobile Broadband Wireless networks VoIP service to users with high mobility requirements, connecting via portable devices which rely on the use of batteries by necessity. Energy consumption significantly affects mobile subscriber stations in wireless broadband access networks. Efficient energy saving is an important and challenging issue because all mobile stations are powered by limited battery lifetimes. Therefore, the authors propose an adaptive mechanism suitable for VoIP service with silence suppression. The proposed mechanism was examined with a computer simulation. The simulation results demonstrate that the proposed mechanism reduces energy consumption.

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4

Kim, Hee-Woong, Sumeet Gupta, and Yoon-Seung Jeon. "User Continuance Intention Towards Mobile Internet Service: The Case Of WiMAX in Korea." Journal of Global Information Management 21, no. 4 (October 2013): 121–42. http://dx.doi.org/10.4018/jgim.2013100107.

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The usage of mobile Internet service has been on the rise as more people become to use mobile devices. WiMAX, a mobile Internet service, was first commercialized in Korea in 2006. However, after first six months, a number of users discontinued the service and switched to other Internet services. Because customer retention is important for the success of any business, this research examines the factors that affect the continued usage of mobile Internet service. A user of a mobile Internet service is both a user of technology and consumer of services. Therefore, to examine the continued usage of mobile Internet service, the authors combine the value adoption model, representing the service consumer perspective, with the information systems continuance model, representing the technology user perspective. The study is conducted in the context of WiMAX. The data was collected from 200 WiMAX users. The model developed in this study is a unique contribution to theory as it discusses the continued adoption of a commercial information system.

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5

So-In, Chakchai, Raj Jain, and Abdel-Karim Tamimi. "Capacity Evaluation for IEEE 802.16e Mobile WiMAX." Journal of Computer Systems, Networks, and Communications 2010 (2010): 1–12. http://dx.doi.org/10.1155/2010/279807.

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We present a simple analytical method for capacity evaluation of IEEE 802.16e Mobile WiMAX networks. Various overheads that impact the capacity are explained and methods to reduce these overheads are also presented. The advantage of a simple model is that the effect of each decision and sensitivity to various parameters can be seen easily. We illustrate the model by estimating the capacity for three sample applications—Mobile TV, VoIP, and data. The analysis process helps explain various features of IEEE 802.16e Mobile WiMAX. It is shown that proper use of overhead reducing mechanisms and proper scheduling can make an order of magnitude difference in performance. This capacity evaluation method can also be used for validation of simulation models.

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6

Kansal, Lavish, Gurjot Singh Gaba, Ashutosh Sharma, Gaurav Dhiman, Mohammed Baz, and Mehedi Masud. "Performance Analysis of WOFDM-WiMAX Integrating Diverse Wavelets for 5G Applications." Wireless Communications and Mobile Computing 2021 (November 1, 2021): 1–14. http://dx.doi.org/10.1155/2021/5835806.

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In the 5th generation (5G) and 6th generation (6G) of wireless mobile telecommunication networks, the requests for an elevated data rate with access to stationary as well as portable customers are going to be overwhelming. Mobile worldwide interoperability for microwave access (WiMAX) comes out as a favourable alternative that is intelligibly developed and more matured than wireless fidelity (Wi-Fi). Mobile WiMAX makes use of the orthogonal frequency division multiple access (OFDMA) technology for its two-way communication to enhance the system performance in fading environments making it more suitable for 5G applications. The diverse OFDM forms deliberated here are the fast Fourier transform- (FFT-) based WiMAX and discrete wavelet transform- (DWT-) based WiMAX. The suggested study exhibits the bit error rate (BER) and peak to average power ratio (PAPR) reduction by integrating different wavelet families, i.e., Haar, symlet, coiflet, and reverse biorthogonal over Rayleigh fading channel. The simulation results obtained by MATLAB depicts an improvement in PAPR reduction, and signal to noise ratio (SNR) requirement is also reduced by 6-12 dB by using DWT-incorporated WiMAX at a BER of 10-4.

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7

Yamaguchi, Kazuhiro, Takaharu Nagahashi, Takuya Akiyama, Hideaki Matsue, Kunio Uekado, Takakazu Namera, Hiroshi Fukui, and Satoshi Nanamatsu. "Computer Simulation and Field Experiment for Downlink Multiuser MIMO in Mobile WiMAX System." Scientific World Journal 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/481676.

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The transmission performance for a downlink mobile WiMAX system with multiuser multiple-input multiple-output (MU-MIMO) systems in a computer simulation and field experiment is described. In computer simulation, a MU-MIMO transmission system can be realized by using the block diagonalization (BD) algorithm, and each user can receive signals without any signal interference from other users. The bit error rate (BER) performance and channel capacity in accordance with modulation schemes and the number of streams were simulated in a spatially correlated multipath fading environment. Furthermore, we propose a method for evaluating the transmission performance for this downlink mobile WiMAX system in this environment by using the computer simulation. In the field experiment, the received power and downlink throughput in the UDP layer were measured on an experimental mobile WiMAX system developed in Azumino City in Japan. In comparison with the simulated and experimented results, the measured maximum throughput performance in the downlink had almost the same performance as the simulated throughput. It was confirmed that the experimental mobile WiMAX system for MU-MIMO transmission successfully increased the total channel capacity of the system.

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8

KIM, Yeong-Jun, Hyun-Il YOO, Kyung-Soo WOO, Jung-Ryun LEE, Heesoo LEE, and Yong-Soo CHO. "A Paging Indicator Transmission Technique for Mobile WiMAX Systems." IEICE Transactions on Communications E92-B, no. 7 (2009): 2542–45. http://dx.doi.org/10.1587/transcom.e92.b.2542.

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9

Yang Yang, Honglin Hu, Jing Xu, and Guoqiang Mao. "Relay technologies for WiMax and LTE-advanced mobile systems." IEEE Communications Magazine 47, no. 10 (October 2009): 100–105. http://dx.doi.org/10.1109/mcom.2009.5273815.

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10

JIN, Jing, Fei WANG, Hong-wen YANG, and Da-cheng YANG. "Adaptive STBC-VBLAST transmission for mobile WiMAX." Journal of China Universities of Posts and Telecommunications 16, no. 6 (December 2009): 38–42. http://dx.doi.org/10.1016/s1005-8885(08)60286-1.

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11

CHO, Soobum, and Sang Kyu PARK. "Modified TR Scheme with Low Complexity in Mobile WiMAX Systems." IEICE Transactions on Communications E94-B, no. 3 (2011): 856–59. http://dx.doi.org/10.1587/transcom.e94.b.856.

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12

Nga, D. T. T., and H. Lim. "Power-saving mechanism with delay bound for Mobile WiMAX systems." IET Communications 5, no. 13 (September 5, 2011): 1854–59. http://dx.doi.org/10.1049/iet-com.2010.0838.

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13

Wu, Po-Han, and Yu Hen Hu. "Optimal Layered Video IPTV Multicast Streaming Over Mobile WiMAX Systems." IEEE Transactions on Multimedia 13, no. 6 (December 2011): 1395–403. http://dx.doi.org/10.1109/tmm.2011.2168196.

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14

Nguyen-Duc, Quang, Lien Pham-Hong, Thang Nguyen-Manh, and Tra Luu-Thanh. "A Combined Algorithm of Kalman Estimator and Guard Interval Optimization for Mobile WiMAX." International Journal of Distributed Systems and Technologies 4, no. 1 (January 2013): 16–28. http://dx.doi.org/10.4018/jdst.2013010102.

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Mobile WiMAX (Worldwide Interoperability for Microwave Access) system has been recently applied widely in wireless communication systems. In this paper, the channel estimation algorithms were studied for the mobile WiMAX system. The comb-type pilot was used for channel estimation algorithms. The authors proposed an adaptive algorithm of channel estimation based on Kalman filter which had good performance in fading channels. Then, based on the result of channel estimation, we proposed an advanced algorithm of GI (Guard Interval) optimization. The results showed that the Kalman estimator combined with GI optimization algorithm showed the best performance in this paper. This algorithm was verified by computer simulation.

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15

Panchal, Sonia, and Satinder Pal. "An Effective Approach to Contention Based Bandwidth Request Mechanism in WiMAX Networks." INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY 3, no. 1 (August 1, 2012): 106–12. http://dx.doi.org/10.24297/ijct.v3i1b.2749.

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In this paper the IEEE 802.16 standard based Mobile WiMAX (Worldwide Interoperability for Microwave Access) system is investigated for the purpose of Quality of Service provisioning. As a potential solution, scheduling algorithms have been taken into major concern. Within the pool of scheduling algorithms and for the purpose Contention based bandwidth request resolution, the Modified Contention Based BW Resolution algorithm (MCB-BWR-Scheme) is proposed. Supported by the fact that the standard does not emphasize a specific scheduling algorithm for contention period based services, therefore, the choice of the scheduling algorithm for the WiMAX systems is very important. There are several scheduling algorithms for WiMAX in the literature, however, studies show that an efficient, fair and robust scheduling algorithm for WiMAX systems is still an open research area and hence a well thought out algorithm will be of great contribution to the area under investigation. Results from the OPNET Modeler simulation program show that the adjusted algorithm works well with delay and throughput constraints. It is also in consistent with the quality of service demands of the video and voice traffic.

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16

Baker, Alaa M., Chee Kyun Ng, Nor Kamariah Noordin, Ahmed Mustafa, and Ayyoub Akbari. "An optimized energy saving mechanism in IEEE 802.16e Mobile WiMAX systems." Journal of High Speed Networks 17, no. 3 (2010): 147–61. http://dx.doi.org/10.3233/jhs-2010-0337.

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17

Pack, Sangheon, Seongyeol Yang, Wonjung Kim, and Wonjun Lee. "Performance Analysis of Multicast and Broadcast Services in Mobile WiMAX Systems." IEEE Communications Letters 15, no. 11 (November 2011): 1246–48. http://dx.doi.org/10.1109/lcomm.2011.090611.110421.

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18

Fong, Mo-han, Robert Novak, Sean Mcbeath, and Roshni Srinivasan. "Improved VoIP capacity in mobile WiMAX systems using persistent resource allocation." IEEE Communications Magazine 46, no. 10 (October 2008): 50–57. http://dx.doi.org/10.1109/mcom.2008.4644119.

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19

Yang, Hyun, Byoung-heon Lee, Jae-hoon Yi, and Young-hwan You. "A Fine Frequency Synchronization and Tracking for Mobile WiMAX Broadcasting Systems." IEEE Transactions on Consumer Electronics 53, no. 4 (November 2007): 1327–32. http://dx.doi.org/10.1109/tce.2007.4429220.

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20

Tacuri, Alexander Hilario. "On the Time-Varying Non-Linearity Effects Over the Spectrum of MIMO-OFDM Wireless Communications Systems." International Journal of Interdisciplinary Telecommunications and Networking 10, no. 2 (April 2018): 25–39. http://dx.doi.org/10.4018/ijitn.2018040103.

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This article presents analytical expressions that can be used in the evaluation of the effects of a non-linear mobile (multi-path) channel on the spectrum of MIMO-OFDM communications systems, such as 4G systems (LTE, WiMax) and probably the future 5G systems. The channel is modeled by a time-varying Volterra Series and the MIMO-OFDM signal by a complex, proper, wide-sense stationary Gaussian random process with zero mean. The resulting mathematical expressions are applied to a specific situation, allowing a quantitative evaluation of the out-band spectrum regrowth of MIMO-OFDM wireless communications systems produced by the use of non-linear devices in mobile channels.

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21

SO, Jaewoo. "Performance Analysis of Persistent Scheduling for VoIP Services in Mobile WiMAX Systems." IEICE Transactions on Communications E94-B, no. 1 (2011): 175–82. http://dx.doi.org/10.1587/transcom.e94.b.175.

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22

Halaoui, Mustapha El, Abdelmoumen Kaabal, Hassan Asselman, Saida Ahyoud, and Adel Asselman. "Dual Band PIFA for WLAN and WiMAX MIMO Systems for Mobile Handsets." Procedia Technology 22 (2016): 878–83. http://dx.doi.org/10.1016/j.protcy.2016.01.063.

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23

El-Najjar, Jad, Chadi Assi, and Brigitte Jaumard. "Maximizing the Network Stability in Mobile WiMAX Mesh Networks." Mobile Networks and Applications 15, no. 2 (May 27, 2009): 253–66. http://dx.doi.org/10.1007/s11036-009-0178-1.

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24

Hu, Yi Hong, Guo Chu Shou, Zong Jue Qian, and Hao Xing Shen. "Research on Converged Access Network of WDM-PON and WiMAX." Applied Mechanics and Materials 58-60 (June 2011): 1583–89. http://dx.doi.org/10.4028/www.scientific.net/amm.58-60.1583.

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Fixed Mobile Convergence (FMC) provides a solution of the converged access network for wired and wireless network. PON and WiMAX are the typical representatives in fiber access network and broadband wireless access network, of which the convergence has great research value. The converged network of PON and WiMAX has the advantage of high-bandwidth, which can provide various kinds of broadband access services and has features of low cost and simple and flexible. There are a variety of system forms for PON technology, one of them with unique advantages is WDM-PON system. In WDM-PON systems, each service has exclusive transmission bandwidth, which makes the converged network of WDM-PON and WiMAX has much more advantages than any other PON network. This paper proposes a converged network model of WDM-PON and WiMAX, and focuses on the analysis of dynamic bandwidth allocation algorithm applicable to the converged network model; then does some simulation of this dynamic bandwidth allocation algorithm, proves that the algorithm has a good delay effect in overload conditions, and analyses the bandwidth rate taken by traffic flow of different service levels under different network load situations.

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25

Sun, Ji Ping, and Fan Zhang. "A Novel Mine Mobile Communication System without Blind Zones." Applied Mechanics and Materials 58-60 (June 2011): 249–55. http://dx.doi.org/10.4028/www.scientific.net/amm.58-60.249.

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To address the problem of wireless communication system existing blind spots in mine tunnels, this paper proposes a novel mine mobile communication systems without blind zones, based on Ethernet Passive Optical Network (EPON) and Radio on Fiber (RoF) technologies, which adopts WiFi, WiMAX and other wireless interface, as well as leaky antenna and distributed antenna. The key technical elements for designing the mine mobile communication system are clarified, and the system components and the dual-bus-shaped network structure are presented. Also, the operating principle and the features of the system are analyzed. In addition, the trend of the technology related to the future mine mobile communication system is presented.

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26

Jiang, Tao, Weidong Xiang, Hsiao-Hwa Chen, and Qiang Ni. "Multicast Broadcast Services Support in OFDMA-Based WiMAX Systems [Advances in Mobile Multimedia]." IEEE Communications Magazine 45, no. 8 (August 2007): 78–86. http://dx.doi.org/10.1109/mcom.2007.4290318.

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27

Seol, Soonuk, and Sungsoo Cho. "An Adaptive Resource Allocation Scheme for Improving VoIP Capacity in Mobile WiMAX Systems." International Journal of Control and Automation 7, no. 4 (April 30, 2014): 279–84. http://dx.doi.org/10.14257/ijca.2014.7.4.24.

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28

Rashid, Mohammad M., and Vijay K. Bhargava. "A Model-Based Downlink Resource Allocation Framework for IEEE 802.16e Mobile WiMAX Systems." IEEE Transactions on Vehicular Technology 59, no. 8 (October 2010): 4026–42. http://dx.doi.org/10.1109/tvt.2010.2060215.

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29

Abdullah Saeed, Rebin. "Performance Comparison of Handover mechanisms in mobile wireless communication networks for Broadband Wireless Access Systems." International Journal of Computer Communication and Informatics 2, no. 1 (May 29, 2020): 25–37. http://dx.doi.org/10.34256/ijcci2014.

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Mobility is the mobile communication characteristics which make it diverse and attractive for all. Wireless communication is now attractive to the whole world and provides the ability of users to communicate very active. Transferring the users from one radio network to another is accomplishing the IT. The process is called the handover process. The transfer takes place by adjusting the duration of the soft transfers, the area size and either by cell crossing or by deterioration in the signal quality of the current channel — the brief overview of handover, Handover in WiMAX and LTE, types of handover, handover types solutions, approaches used in literature are typically transfer parameters and I contemporary the convergent fact for continuance in the area of mobile and wireless communication Handover.

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30

More, Anant R., Wankhede Vishal A., and M. S. G. Prasad. "Optimize Transmission of Image over Integrated Mobile WiMAX and WiLAN Network." International Journal of Engineering & Technology 7, no. 2.17 (April 15, 2018): 17. http://dx.doi.org/10.14419/ijet.v7i2.17.11706.

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The problem of multiuser downlink resource allocation in Mobile WiMAX system was studied. Three different network scenarios considered for the transmission of image data. Resource allocation is done using Active Set Optimization and Genetic Algorithm, for all the three network scenarios. Simulation results show that information fed back and association among subcarriers play vital role to improve system performance. As compared to reduced complexity, resource allocation using Active Set Optimization and Genetic Algorithm seems especially attractive as the number of users increases for Image Data. It is observed through simulation that the System using Genetic Algorithm performs better than Active Set. Linear Resource Allocation in terms of significantly decreasing the computational complexity and achieve higher capacities, while being applicable to a more general class of systems. As Genetic Algorithm follows constraints of Stochastic processes it didn’t give results highest in all Experiment Conducted. It is also observed that for Integer-Binary Objective function Performance of Genetic Algorithm is not that much satisfied because of its stochastic processing. Also processing time required to reach final optimize variables values is too much.

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31

Jo, Jaeho. "Cross-layer Optimized Vertical Handover Schemes between Mobile WiMAX and 3G Networks." KSII Transactions on Internet and Information Systems 2, no. 4 (August 25, 2008): 171–83. http://dx.doi.org/10.3837/tiis.2008.04.001.

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32

Jung, Young-Bae, and Soon-Young Eom. "A Compact MultiBand and Dual-Polarized Mobile Base-Station Antenna Using Optimal Array Structure." International Journal of Antennas and Propagation 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/178245.

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This paper introduces a multiband base-station antenna to provide multiple communications services. There is growing need for multiband base-station antennas for mobile communications to serve existing 2nd and 3rd generation systems and to provide emerging 4th generation communication service as well as WiFi. For example, cellular, PCS, and especially WCDMA service are currently widely used in Korea, and 4th generation service (WiBro and LTE), introduced in 2011, will have to operate in parallel with existing services. The proposed multiband base-station antenna can provide a single/dual/triple or more multiple services using dual-polarization (±45° linear polarizations) according to the requirements of the service provider. This antenna has a shared aperture, having several array antenna sets for multiple services (Band 1: cellular service in 0.824~0.894 GHz, Band 2: PCS, WCDMA, and WiFi in 1.920~2.170 GHz, Band 3: WiBro and WiMAX in 2.300~2.400 GHz, and Band 4: WiMAX in 5.150~5.850 GHz). This antenna can be helpful for reducing base-station operating expenses and to create a clean urban landscape by minimizing the number of base-station antennas, which are increasing rapidly.

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33

So, Jaewoo. "Performance analysis of VoIP services in mobile WiMAX systems with a hybrid ARQ scheme." Journal of Communications and Networks 14, no. 5 (October 2012): 510–17. http://dx.doi.org/10.1109/jcn.2012.00008.

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34

Ali-Yahiya, Tara, André-Luc Beylot, and Guy Pujolle. "An adaptive cross-layer design for multiservice scheduling in OFDMA based mobile WiMAX systems." Computer Communications 32, no. 3 (February 2009): 531–39. http://dx.doi.org/10.1016/j.comcom.2008.09.016.

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35

Wang, Tairan, Zhifeng Tao, Andreas F. Molisch, Philip V. Orlik, and Jinyun Zhang. "Adaptive antenna selection at mobile stations for SDMA in WiMAX networks." Wireless Communications and Mobile Computing 10, no. 1 (January 2010): 70–86. http://dx.doi.org/10.1002/wcm.911.

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36

Wang, Xiaofei, Min Chen, Hyun-chul Kim, Ted “Taekyoung” Kwon, Yanghee Choi, and Sunghyun Choi. "Measurement and analysis of online gaming services on mobile WiMAX networks." Wireless Communications and Mobile Computing 15, no. 7 (September 11, 2013): 1198–211. http://dx.doi.org/10.1002/wcm.2412.

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37

Pham, Phuong Thi Thu, and Tomohisa Wada. "Effective Scheme of Channel Tracking and Estimation for Mobile WiMAX DL-PUSC System." Journal of Computer Systems, Networks, and Communications 2010 (2010): 1–9. http://dx.doi.org/10.1155/2010/806279.

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This paper introduces an effective joint scheme of channel estimation and tracking for downlink partial usage of subchannel (DL-PUSC) mode of mobile WiMAX system. Based on the pilot pattern of this particular system, some channel estimation methods including conventional interpolations and a more favorable least-squares line fitting (LSLF) technique are comparatively studied. Besides, channel estimation performance can be remarkably improved by taking advantage of channel tracking derived from the preamble symbol. System performances in terms of packet error rate (PER) and user link throughput are investigated in various channels adopted from the well-known ITU models for mobile environments. Simulation results show a significant performance enhancement when the proposed joint scheme is utilized, at least 5 dB, compared to only commonly used channel estimation approaches.

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38

Martini, Maria G., and Chaminda T. E. R. Hewage. "Flexible Macroblock Ordering for Context-Aware Ultrasound Video Transmission over Mobile WiMAX." International Journal of Telemedicine and Applications 2010 (2010): 1–14. http://dx.doi.org/10.1155/2010/127519.

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The most recent network technologies are enabling a variety of new applications, thanks to the provision of increased bandwidth and better management of Quality of Service. Nevertheless, telemedical services involving multimedia data are still lagging behind, due to the concern of the end users, that is, clinicians and also patients, about the low quality provided. Indeed, emerging network technologies should be appropriately exploited by designing the transmission strategy focusing on quality provision for end users. Stemming from this principle, we propose here a context-aware transmission strategy for medical video transmission over WiMAX systems. Context, in terms of regions of interest (ROI) in a specific session, is taken into account for the identification of multiple regions of interest, and compression/transmission strategies are tailored to such context information. We present a methodology based on H.264 medical video compression and Flexible Macroblock Ordering (FMO) for ROI identification. Two different unequal error protection methodologies, providing higher protection to the most diagnostically relevant data, are presented.

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39

Coqueiro, Thiago, José Jailton, Tássio Carvalho, and Renato Francês. "A Fuzzy Logic System for Vertical Handover and Maximizing Battery Lifetime in Heterogeneous Wireless Multimedia Networks." Wireless Communications and Mobile Computing 2019 (January 10, 2019): 1–13. http://dx.doi.org/10.1155/2019/1213724.

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Bandwidth and power hungry applications are proliferating in mobile networks at a rapid pace. However, mobile devices have been suffering from a lack of sufficient battery capacity for the intensive/continuous use of these applications. In addition, the mobile ecosystem is currently heterogeneous and comprises a plethora of networks with different technologies such as LTE, Wi-Fi, and WiMaX. Hence, an issue must be addressed to ensure that quality of experience (QoE) is provided for the users in this scenario: an energy-efficient strategy that is designed to extend the battery lifetime of mobile devices. This paper proposes an architecture which provides an intelligent decision-making support system based on Fuzzy Logic for saving the energy of mobile devices within an integrated LTE and Wi-Fi network. The simulated experiments show the benefits of the solution this architecture can provide by using QoE metrics.

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40

Louta, M., P. Sarigiannidis, S. Misra, P. Nicopolitidis, and G. Papadimitriou. "RLAM: A Dynamic and Efficient Reinforcement Learning-Based Adaptive Mapping Scheme in Mobile WiMAX Networks." Mobile Information Systems 10, no. 2 (2014): 173–96. http://dx.doi.org/10.1155/2014/213056.

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WiMAX (Worldwide Interoperability for Microwave Access) constitutes a candidate networking technology towards the 4G vision realization. By adopting the Orthogonal Frequency Division Multiple Access (OFDMA) technique, the latest IEEE 802.16x amendments manage to provide QoS-aware access services with full mobility support. A number of interesting scheduling and mapping schemes have been proposed in research literature. However, they neglect a considerable asset of the OFDMA-based wireless systems: the dynamic adjustment of the downlink-to-uplink width ratio. In order to fully exploit the supported mobile WiMAX features, we design, develop, and evaluate a rigorous adaptive model, which inherits its main aspects from the reinforcement learning field. The model proposed endeavours to efficiently determine the downlink-to-uplinkwidth ratio, on a frame-by-frame basis, taking into account both the downlink and uplink traffic in the Base Station (BS). Extensive evaluation results indicate that the model proposed succeeds in providing quite accurate estimations, keeping the average error rate below 15% with respect to the optimal sub-frame configurations. Additionally, it presents improved performance compared to other learning methods (e.g., learning automata) and notable improvements compared to static schemes that maintain a fixed predefined ratio in terms of service ratio and resource utilization.

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41

Sandhu, Gurpriya, and Garima Saini. "Comparison of Fixed and Mobile Wimax Systems using Hybrid DSI-PTS Technique for PAPR Reduction." International Journal of Computer Applications 73, no. 22 (July 26, 2013): 29–32. http://dx.doi.org/10.5120/13036-0222.

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42

Lee, Hyungkeuk, and Sanghoon Lee. "Definition of a new service class, artPS for video services over WiBro/Mobile WiMAX systems." Wireless Networks 17, no. 1 (July 28, 2010): 103–17. http://dx.doi.org/10.1007/s11276-010-0267-x.

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43

Wong, Gary K. W., Qian Zhang, and Danny H. K. Tsang. "Switching cost minimization in the IEEE 802.16e mobile WiMAX sleep mode operation." Wireless Communications and Mobile Computing 10, no. 12 (December 2010): 1576–88. http://dx.doi.org/10.1002/wcm.875.

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44

Anbazhagan, Rajesh, and Nakkeeran Rangaswamy. "Investigation on Mutual Contention Bandwidth Request Mechanisms in Two-Hop Relay Network with ITU-R Path Loss Models." ISRN Communications and Networking 2013 (May 29, 2013): 1–13. http://dx.doi.org/10.1155/2013/417132.

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The performance of two-hop contention based bandwidth request (BR) mechanism for WiMAX relay networks is investigated under ITU-R path loss models. In conventional WiMAX systems, the mobile stations (MS) update their contention window irrespective of their transmission failures. Those systems update their contention window on collision and due to channel error or unavailability of bandwidth. Further, these failure models have been suggested for single hop networks. The failure model in two-hop systems becomes complex since it may include additional failure events such as improper detection of codes and channel error due to varying path loss. Interestingly, these failure events (collision, channel error, unavailability of bandwidth, and improper detection of codes) do not occur evenly for both hops of a link. Hence, to set the contention window effectively, unique failure models are developed by considering the characteristics of BR mechanism and hop at which the BR is performed. In the proposed system, the two-hop BR is carried out with all combinations of message and code bandwidth request schemes. Among them, the message-code BR mechanism performs better under suburban fixed and outdoor to indoor or pedestrian environment, and code-code BR scheme performs better for vehicular environment.

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Antoniou, Josephina, Christophoros Christophorou, Augusto Neto, Susana Sargento, Filipe Pinto, Nuno Carapeto, Telma Mota, Jose Simoes, and Andreas Pitsillides. "Session and Network Support for Autonomous Context-Aware Multiparty Communications in Heterogeneous Mobile Systems." International Journal of Handheld Computing Research 1, no. 4 (October 2010): 1–24. http://dx.doi.org/10.4018/jhcr.2010100101.

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The increase of networking complexity requires the design of new performance optimization schemes for delivering different types of sessions to users under different conditions. In this regard, special attention is given to multi-homed environments, where mobile devices cross areas with overlapping access technologies (Wi-Fi, 3G, WiMax). In such a scenario, efficient multiparty delivery depends upon the grouping operation, which must be done based on several parameters. In this paper, the authors propose context-aware sub-grouping of content-based service groups so that the same service session can be delivered using different codings of the same content, adapting to current network, users, session, and environment context. The context-aware information is used to improve the sub-grouping process. This paper aims to describe these sub-grouping techniques, and in particular how they improve network performance and user experience in the future Internet by focusing on the improved network-level and session-level mechanisms.

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So-In, Chakchai, Raj Jain, and Abdel-Karim Al-Tamimi. "A Scheduler for Unsolicited Grant Service (UGS) in IEEE 802.16e Mobile WiMAX Networks." IEEE Systems Journal 4, no. 4 (December 2010): 487–94. http://dx.doi.org/10.1109/jsyst.2010.2083171.

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Mekki, Anwer Sabah, Siba Monther Yousif, Bashar Mudhafar Ahmed, and Mustafa Mohammed Jawad. "An end-fire low profile patch antenna to work on WiMAX frequencies used for harvesting power supply." Bulletin of Electrical Engineering and Informatics 10, no. 5 (October 1, 2021): 2678–85. http://dx.doi.org/10.11591/eei.v10i5.3166.

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In this paper, an end-fire microstrip patch antenna (MPA) is proposed of 3 GHz as a center frequency, designed, simulated, and measured to work on WiMAX frequencies within standard of 802.16e (WiMAX). A high gain ranged between (12.117-13.324) dB, high front to back ratio (F/B) of (35.770) at the center frequency, a wide band of 1.701 GHz, low profile, and semi-ideal voltage standing wave ratio (VSWR) of 1.053 is achieved. The simulation is done using computer simulation technology (CST-MW). The proposed design is based on two Fire-retardant substrates (FR-4) of relative permittivity (ε) 4.3+j0.025 and 1.53 mm thickness for each one, which is considered a high loss material. The measurement results show good agreement with the simulated results. In addition, the design can be used for harvesting power supply from mobile towers. Finally, the proposed design is compared with two other designs in terms of power conversion efficiency and overall size.

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Yu, Chu, and Mao-Hsu Yen. "Area-Efficient 128- to 2048/1536-Point Pipeline FFT Processor for LTE and Mobile WiMAX Systems." IEEE Transactions on Very Large Scale Integration (VLSI) Systems 23, no. 9 (September 2015): 1793–800. http://dx.doi.org/10.1109/tvlsi.2014.2350017.

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Liu, Bao Yuan, Shih Yu Chang, and Tai Chi Wang. "Joint improvements for capacity and power-efficiency of mobile WiMAX by relaying schemes." Wireless Communications and Mobile Computing 13, no. 4 (March 15, 2011): 361–76. http://dx.doi.org/10.1002/wcm.1104.

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Hwang, Bor-Jiunn, I.-Shyan Hwang, and Wei-Ren Chen. "Adaptive radio resource management for interactive user-centric IPTV services in mobile WiMAX networks." Information Sciences 181, no. 18 (September 2011): 4024–40. http://dx.doi.org/10.1016/j.ins.2011.04.016.

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