High throughput computing (HTC) is of great importance in grid computing environments. HTC is aimed at minimizing the total makespan of all of the tasks submitted to the grid environment in long execution of the system. To achieve HTC in grids, suitable task scheduling algorithms should be applied to dispatch the submitted tasks to the computational resources appropriately. In this paper, a new...

Backscatter wireless communications have exceptionally stringent power constraints. This is particularly true for ambient backscatter systems, where energy and wireless carrier are both extracted from weak existing radio signals. The tight power constraints make it difficult to implement advanced coding techniques like spread spectrum, even though such techniques are effective in increasing the...

Wireless sensor networks (WSNs) are a popular wireless technologies to access the internet and growth of using TCP/IP model indicates many applications is supported by TCP to connect mobile nodes over wireless links. Development of new wireless networks like wireless sensor networks makes it essential to improve TCP's Performance. TCP is initially developed for wired networks where each packet ...

The driver for the choice of alternating use of modulation scheme is to increase the data rates where there is enough signal power to transmit it and improve the overall throughput performance. The adaptive modulation is a bit loading scheme exploited to increase the throughput performance of a communication link. This scheme will take into account the varying SNR values across the N subcarrier...

Voice over Internet Protocol (VoIP) offers a wide range of benefits to both enterprises and communications & network service providers. It provides an alternate way to make a telephone call as compared to the Public Switched Telephone Network (PSTN). The industry is slowly recognizing the potential of Voice over IP and many VOIP applications have been developed in the last ten years. This paper...

Mobile Ad Hoc Network (MANET) consists of dynamic topology as nodes in the network are mobile, and connected via wireless links. The nodes are grouped in clusters for the purpose of routing. Nodes within the cluster communicate directly. However, nodes communicate outside the cluster through a centralized node that is called a clusterhead. An elected clusterhead is assigned for communication wi...

Symbiosis is a term from biology meaning the living together of dissimilar organisms in close proximity. We adapt that term to refer to an increase in throughput that can occur when jobs are coscheduled on multithreaded machines. On a multithreaded machine such as the Tera MTA (Multithreaded Architecture) coscheduled jobs share system resource very intimately on a cycle by cycle basis. This can...

We propose a combined uplink/downlink opportunistic scheduling algorithm for infrastructure WLANs. In the presence of both uplink and downlink flows, an infrastructure WLAN suffers from the uplink/downlink unfairness problem which severely decreases the throughput of the access point (AP). We resolve the unfairness by maintaining a separate queue and a backoff timer for each associated mobile s...

In IEEE 802.11 based wireless networks adding more access points does not always guarantee an increase of network capacity. In some cases, additional access points may contribute to degrade the aggregated network throughput as more interference is introduced. This paper characterizes the power interference in CSMA/CA based networks consisting of nodes using directional antenna. The severity of ...

A standardization effort has started within the IEEE802.11 Working Group to define the next generation of 802.11 Wireless LANs. This article illustrates how throughput achieved above the MAC layer of 5 GHz WLANs can be increased from an existing 30 Mbit/s maximum with 802.11a to rates exceeding 90 Mbit/s. After a brief review of ongoing WLAN standardization activities, the support of a higher p...