Topic
Testbed
About: Testbed is a research topic. Over the lifetime, 10858 publications have been published within this topic receiving 147147 citations. The topic is also known as: test bed.
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08 Dec 2008TL;DR: A testbed system implementation is presented to evaluate the performance of an infrastructure controlled cooperative video streaming architecture and to derive an analytical model that relates power consumption to various design and system parameters.
Abstract: A promising approach for power reduction in mobile devices is peer-to-peer cooperation. In this paper, we present a testbed system implementation to evaluate the performance of an infrastructure controlled cooperative video streaming architecture. A number of mobile devices in close proximity are connected to the Internet through a wireless access point and are all requesting the same video stream from a dedicated server. Instead of sending the stream independently to each device, the server distributes the video packets among the devices, over a long-range wireless link using WLAN technology; the devices then exchange the received packets among each other over short-range wireless links using Bluetooth technology. The implemented testbed is used to experimentally demonstrate the power reduction gains in mobile devices and to derive an analytical model that relates power consumption to various design and system parameters.
59 citations
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TL;DR: In this article, an approximate maximum-likelihood (AML) method for source localization and direction-of-arrival (DOA) estimation is proposed for real-time operation.
Abstract: Wireless sensor networks have been attracting increasing research interest given the recent advances in microelectronics, array processing, and wireless networking. Consisting of a large collection of small, wireless, low-cost, integrated sensing, computing and communicating nodes capable of performing various demanding collaborative space-time processing tasks, wireless sensor network technology poses various unique design challenges, particularly for real-time operation. We review the approximate maximum-likelihood (AML) method for source localization and direction-of-arrival (DOA) estimation. Then, we consider the use of least-squares method (LS) method applied to DOA bearing crossings to perform source localization. A novel virtual array model applicable to the AML-DOA estimation method is proposed for reverberant scenarios. Details on the wireless acoustical testbed are given. We consider the use of Compaq iPAQ 3760s, which are handheld, battery-powered device normally meant to be used as personal organizers (PDAs), as sensor nodes. The iPAQ provide a reasonable balance of cost, availability, and functionality. It has a build in StrongARM processor, microphone, codec for acoustic acquisition and processing, and a PCMCIA bus for external IEEE 802.11b wireless cards for radio communication. The iPAQs form a distributed sensor network to perform real-time acoustical beamforming. Computational times and associated real-time processing tasks are described. Field measured results for linear, triangular, and square subarrays in free-space and reverberant scenarios are presented. These results show the effective and robust operation of the proposed algorithms and their implementations on a real-time acoustical wireless testbed.
59 citations
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TL;DR: CAMEO is a light-weight context-aware middleware platform for mobile devices designed to support the development of real-time mobile social network (MSN) applications and provides a common application programming interface to MSN applications through which they can exploit context- and social-aware functionalities to optimize their features.
59 citations
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TL;DR: This work presents the design and evaluation of Wireless cOngestion Optimized Fallback (WOOF), a rate adaptation scheme that uses congestion measurement to identify congestion-related packet losses and achieves up to 300 percent throughput improvement in congested networks.
Abstract: Rate adaptation is a critical component that impacts the performance of IEEE 802.11 wireless networks. In congested networks, traditional rate adaptation algorithms have been shown to choose lower data-rates for packet transmissions, leading to reduced total network throughput and capacity. A primary reason for this behavior is the lack of real-time congestion measurement techniques that can assist in the identification of congestion-related packet losses in a wireless network. In this work, we first propose two real-time congestion measurement techniques, namely an active probe-based method called Channel Access Delay, and a passive method called Channel Busy Time. We evaluate the two techniques in a testbed network and a large WLAN connected to the Internet. We then present the design and evaluation of Wireless cOngestion Optimized Fallback (WOOF), a rate adaptation scheme that uses congestion measurement to identify congestion-related packet losses. Through simulation and testbed implementation we show that, compared to other well-known rate adaptation algorithms, WOOF achieves up to 300 percent throughput improvement in congested networks.
59 citations
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TL;DR: This work presents a portable userspace implementation of CTCP and extensively evaluate its performance in both testbed and production wireless networks.
Abstract: We introduce CTCP, a reliable transport protocol using network coding. CTCP is designed to incorporate TCP features such as congestion control, reliability, and fairness while significantly improving on TCP's performance in lossy, interference-limited and/or dynamic networks. A key advantage of adopting a transport layer over a link layer approach is that it provides backward compatibility with wireless equipment installed throughout existing networks. We present a portable userspace implementation of CTCP and extensively evaluate its performance in both testbed and production wireless networks.
59 citations