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WiMAX technology supports to different MAC and Physical Layer parameters. The performance of TCP Linux in WiMAX network is analyzed by varying MAC layer and Physical layer parameter such as channel bandwidth, cyclic prefix, modulation coding scheme, frame duration, DL: UL ratio, propagation model, full duplex mode of data transfer and other operating parameter such as downloading traffic. These parameters...
Heterogeneous Network consists of wired and wireless network. In these networks, congestion control and quality of service is major issue. Due to this issues, delay and jitter are increased which decreases the performance of network. For reducing this issues there are various queue management techniques which are classified as Active Queue Management and Passive Queue Management. AQM consists of access...
The integration of WiFi and WiMAX will allow a seamless connection between users for both connections with larger capacity, higher speeds and mobility access. A special router is needed to allow the interconnection between two different protocol network known as WiFi/WiMAX router. In this paper, we investigate and simulated based on the scenario using OPNET modeler simulation tools and compared their...
WiMAX (World Wide Interoperability for Microwave Access) is a standard based technology based on IEEE 802.16 Air Interface. This standard is the future mode of mobile communication. Therefore, it is important to evaluate the performance of WiMAX in different scenarios. In this paper we have presented performance analysis of WiMAX for the CBR (Constant Bit Rate) traffic with and without mobility. Two...
Based on the laws of the known mechanisms of the frequency resources scheduling in the download channel, solution of the problem raised in this paper assures QoS by available resources which directly influent on quality of design of the equipment. The WiMAX resource allocation algorithms determine which users to schedule, how to allocate subcarriers to them, and how to determine the appropriate power...
WiMAX with an OFDM physical layer employed is sensitive to carrier frequency offset. Even though most of this offset can be compensated with the initial training sequence, there still remains a residual frequency offset due to estimation errors. In this paper, we investigate pilot-based and data-aided residual frequency offset estimators and apply them to WiMAX. To improve the pilot-based method,...
The integration and deployment of pattern reconfigurable antenna arrays in real-world wireless systems have been inhibited by the prohibitively high costs of implementation and integration infrastructure. As a result, many research institutions have turned to Software-Defined Radio (SDR) solutions as a cost-efficient alternative. This work discusses various relevant platforms that could be used for...
Scheduler is one of the main components in WiMAX networks to ensure efficiency use of radio resources. In this paper we will be presenting a review for some of scheduler algorithms for OFDMA based WiMAX networks, MaxSNR scheduler, Proportional Fair (PF) scheduler, Round Robin (RR) algorithm and a novel scheduling algorithm MORRA. The MORRA algorithm takes into account both channel conditions and fairness...
This article proposes an optimization model for the LTE RAN network planning that aimed to accounting of services multi-period planning. The analysis of experiments results showed that formulation of the problem, which is shown in paper and presented as a problem of MILP, allows to obtain the correct solutions from the practical point of view. Comparison of the result showed that usage of multi-period...
In this paper, transmission performance for downlink MU-MIMO (Multiuser Multiple-Input Multiple-Output) systems with computer simulation and field experiment are described. The downlink MU-MIMO system is constructed as a transmitter with 6 antennas and receivers with 2 antennas, and the maximum number of users(receivers) is 3. In computer simulation, MU-MIMO transmission system can be realized by...
In this paper we present a framework for evaluating wireless network performance through emulation. The framework uses a hybrid design in which the PHY layer is represented by a probabilistic model, whereas the MAC layer is executed as a functional module. Actual network applications and protocols are employed in order to create realistic test conditions. We use WiMAX as a case study to show the feasibility...
Day to day life people are using new technology and communication between user and it is easy in the new era, so the wimax is the worldwide interoperability microwave access(IEEE - 802.16) technology provide good accessibility to user and its results are better than the recent technology (2G,3G). In this paper I have implemented the performance and analysis result of wimax communication using recent...
Competitive environment has led popularity of VoIP over WiMAX due to its large transmission bandwidth coverage, and Quality of Service (QoS) support. For voice calls applications such as MSN Messenger, Google Talk, and Skype, VoIP is an emerging technology for WiMAX networks. In this kind of network, performance analysis of node mobility depends on network connectivity. This paper has considered horizontal...
In this paper, we analysed the interference effects of Korea's LTE-TDD system by Japan's WiMAX system using the 2.5GHz frequency band. We performed Monte-Carlo simulations on the average throughput loss to evaluate how much interference radiating from Japan's WiMAX is imposed on the Korean LTE-TDD system and the Advanced Propagation Model (APM) for calculating the propagation loss occurring in duct...
This paper presents a generic RAM based FPGA architecture for decoding of Multi Rate Quasi-Cycling LDPC codes. RAM based decoding enables us to reduce permutation networks into simple address controllers. Moreover, utilizing Block RAMs with various aspect ratios in an FPGA provides flexibility ranging from area driven compact designs to fully parallelized high throughput designs. Utilizing the read-first...
This paper proposes a scalable prototype surveillance/alarm ITS (Intelligent Transportation System) for roadways safety applications over roadway environments with emphasis given in the wireless vehicular communication inside a tunnel after an emergency event. A heterogeneous hybrid vehicular wireless network consisted of IEEE 802.11b/g/e and IEEE 802.16e is being deployed inside a tunnel environment...
This paper describes the fixed and mobile SDN access area network architecture, suitable nodes which can reduce consumption power more than 50% and feasibility test results for multi-resource high user experience layer 4 communication with MPTCP and OpenFlowSwitch.
The performance of smart grid applications such as advanced metering infrastructure (AMI) and demand response management (DRM) can be improved by exploiting wireless communication technologies. The communication data loading and data losses in smart grid impact the system. In this work, we propose the routing protocol which adopts the cooperative transmission architecture in smart grid communications...
Handoff management is a critical issue for seamless connectivity in heterogeneous networks. Call termination due to migration from one network to other network is not appreciated in today's high- speed communication intensive world. This paper deals with the problem of vertical handoff in heterogeneous networks for streaming data. In this paper, a novel method is proposed for vertical handoff by using...
Adaptive Modulation and Coding (AMC) is one of key technologies in 4G system. Band AMC technique enables the Orthogonal Frequency-Division Multiple Access (OFDMA) system to achieve their maximum throughput by efficient utilization of wireless channel characteristics. Band AMC with the adjacent subcarrier allocation specified in 4G system (Worldwide Interoperability for Microwave Access (WiMAX) standard)...
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