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Closed-loop rate adaptive scheme is mutually considered both the rate and CW values. CRAS is a receiver-assisted rate adaptation protocol. It also considers the loss of frames due to collisions. The information about atmosphere energy level of a sender is carried via the DATA packet with one extra byte. It introduces a rate suggestion (RS) chart, that received via continuously observing the atmosphere...
Currently, IEEE 802.11 is the de facto standard for WLANs. It species both the medium access control and the physical layers for WLANs. The scope of IEEE 802.11 working groups (WGs) is to propose and develop MAC and PHY layer specifications for WLAN to handle mobile and portable stations. In this standard, the MAC layer operates on top of one of several possible physical layers. Medium access is performed...
We present a centralized integrated approach, ADWISER, for (i) managing an Internet access link bandwidth, and (ii) for enhancing the performance of an IEEE 802.11 WLAN. Our single-box approach is an extension to our previous work, where we focused on meeting TCP performance objectives over WLANs. In this work, we present a novel cascaded packet scheduling algorithm to address the issue of unfair...
In this paper, we propose a new throughput analysis for IEEE 802.11 distributed coordination function (DCF) considering the real channel conditions and capture effects under arbitrary load conditions employing basic access method. The aggregate throughput of a practical wireless local area (WLAN) strongly depends on the channel conditions. In real radio environment, the received signal power at the...
A novel printed monopole antenna with dual wideband is presented for simultaneously satisfying wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) applications. The antenna structure consists of a rectangular monopole with a microstrip feed line for excitation and a trapezoid conductor-backed plane for band broadening. The measured 10 dB bandwidth for return...
In our earlier work, the authors proposed WLAN Manager (or WM) a centralised controller for QoS management of infrastructure WLANs based on the IEEE 802.11 DCF standards. The WM approach is based on queueing and scheduling packets in a device that sits between all traffic flowing between the APs and the wireline LAN, requires no changes to the AP or the STAs, and can be viewed as implementing a ldquoSplit-MACrdquo...
This paper provides an analysis of optimum offered load that maximizes the throughput of IEEE 802.11 media access control (MAC) protocol for the multihop network. We extend Ping Chung Ng analysis in presence of hidden terminal and capture effect, with some modifications in the derivation of throughput. The analytical throughput results are validated against ns-2 simulation using direct sequence spread...
This paper presents an analytical model and the performance study of IEEE 802.11 distributed coordination function (DCF) for the nonsaturated heterogeneous traffic. In this paper, we modify the Bianchipsilas Markov chain model for the nonsaturated environment and analyze the throughput under several conditions and several set of parameters, with the aim of obtaining the accurate throughput when stations...
This paper presents an analytical model for the performance study of IEEE 802.11 distributed coordination function (DCF). The maximum throughput can be achieved well below the saturated load. The analytical model for finite load must be studied to know the performance of the medium access control (MAC) layer below the saturated load. We extend the Bianchipsilas saturation model for the nonsaturated...
This paper provides an analysis of optimum offered load that maximizes the throughput of IEEE 802.11 Media Access Control (MAC) protocol for the multihop network. We extend Ping Chung Ng analysis in presence of hidden terminal and capture effect, with some modifications in the derivation of throughput. The analytical throughput results are validated against simulation using Direct Sequence Spread...
Optimizing the single FPGA board resource as a simulator in a multi user environment regardless of the physical distance improved by TCP/IP. It is important step for IP and system development to use FPGA and IP core to design and improve flow of multi user data in a high speed communication internet environment and optimal utilization of available bandwidth. A user can connect either by Wi-Fi, Wi-Max...
Wireless Sensor Networks (WSN) are planned to be deployed in critical applications like border surveillance, monitoring physical and chemical environmental phenomena, intelligent agriculture and personal healthcare. Theses days, researcherspsila vision is to implant sensor nodes in the human body, which will monitor the biological parameters and report them to the patient and the doctor, when abnormalities...
A 3 times 3 MIMO baseband and MAC processor in 0.18 mum 6M CMOS occupies 62.1 mm2 and dissipates (Tx/Rx) 1379/1200mW at 1.8V including ADCs, DACs, and PCI/PCIe PHY. The integrated BB and MAC delivers up to 300Mb/s in 40MHz bandwidth, greater than 150Mb/s TCP throughput best case and a maximum range of 700ft range.
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