An integrated cmos rf synthesizer for 802.11a wireless lan

Peters, Frank; Fischer, Gunter; Gustat, H.

doi:10.1109/jssc.2003.817601

Cited by 85 publications

(51 citation statements)

References 12 publications

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“…It then applies the compaction step to this transmission to find the 'best' packing (lines 2-4). Next, the algorithm goes through the rest of the transmissions in a randomized order, and adds them to the transmission schedule if they improve the throughput (lines [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. This is done by adding a transmission to the currently packed set, and then repeatedly invoking the compaction step for the each of the transmissions in succession.…”

Section: Transmission Packingmentioning

confidence: 99%

“…While one interface is active during an epoch (i.e., it is involved in communication), the other interface prepares for the next epoch. These switching overheads could reduce in future; emerging wireless cards have switching latencies of less than 100 µs [1], while prior work in solid state electronics has shown that this delay can be reduced to as low as 40 µs [9]. Finally, in order to maintain an accurate conflict graph that can take into account the dynamics of the environment, it is important that the signal strengths are frequently updated.…”

Section: Implementation Aspectsmentioning

confidence: 99%

See 1 more Smart Citation

FLUID: Improving Throughputs in Enterprise Wireless LANs through Flexible Channelization

Rayanchu

Shrivastava

Banerjee

et al. 2012

IEEE Trans. on Mobile Comput.

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This paper introduces models and a system for designing 802.11 wireless LANs (WLANs) using flexible channelization -the choice of an appropriate channel width and center frequency for each transmission. In contrast to current 802.11 systems that use fixed width channels, the proposed system, FLUID, configures all access points and their clients using flexible channels. We show that a key challenge in designing such a system stems from managing the effects of interference due to multiple transmitters employing variable channel widths, in a network-wide setting. We implemented FLUID in an enterprise-like setup using a 50 node testbed (with off-the shelf wireless cards) and we show that FLUID improves the average throughput by 59% across all PHY rates, compared to existing fixed-width approaches.

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Section: Transmission Packingmentioning

confidence: 99%

Section: Implementation Aspectsmentioning

confidence: 99%

FLUID: Improving Throughputs in Enterprise Wireless LANs through Flexible Channelization

Rayanchu

Shrivastava

Banerjee

et al. 2012

IEEE Trans. on Mobile Comput.

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“…Herzel et al [17] point out that the device-level channel switching latency in an IEEE 802.11 Network Interface Card (NIC) is approximately 80 s, which is very small. But if the channel switching happens when wireless devices are engaged in some communications, the upper layer protocols such as MAC-layer and routing-layer protocols will have a significant impact on the switching latency as we will show later.…”

Section: Related Workmentioning

confidence: 99%

How to Effectively Use Multiple Channels in Wireless Mesh Networks

Scalabrino

Fang

et al. 2009

IEEE Trans. Parallel Distrib. Syst.

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Abstract-Operating on a frequency band occupying several nonoverlapping channels, IEEE 802.11 is now widely used in Wireless Mesh Networks (WMNs). Many multichannel MAC protocols are proposed to improve the spatial reuse in the network under the assumption that the transmissions on nonoverlapping channels do not interfere with each other. Some joint routing and channel assignment algorithms are also designed to increase the network throughput based on the premise that we can switch between different channels freely. Although simulations show that great improvements on network throughput can be observed in both cases, two fundamental questions remain: 1) Can we really use multiple nonoverlapping channels freely in WMNs? 2) If we can, what will be the cost when we switch channels dynamically and frequently? In this paper, by conducting extensive experiments on our testbed, we attempt to answer these questions. We find that in spite of interference between both overlapping and nonoverlapping channels, we can still use multiple channels in mesh networks under certain conditions but with care. We also show that the channel switching cost is actually very significant in WMNs. We recommend not to switch the channels too frequently when designing the channel assignment algorithms, and those channel assignment algorithms selecting one channel for each packet are not really beneficial.

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“…The channel switching time T sw is 80 µs [8], [9], and the packet size is set to 1K bytes. The TXOP is given as 3ms (e.g., for AC_VI in 802.11e).…”

Section: B Simulationmentioning

confidence: 99%

SPLASH: A Simple Multi-Channel Migration Scheme for IEEE 802.11 Networks

Yang

Lee

Seo

et al. 2008

VTC Spring 2008 - IEEE Vehicular Technology Conference

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Abstract-Simultaneously utilizing multiple channels can be an effective counter-measure to the performance degradation stemming from high contention in the IEEE 802.11-based networks. This is especially true in multi-hop networks where spatial interference exacerbates the contention problem. Existing proposals use a special channel, a time window, or an orchestrated channel switching schedule to coordinate the spreading of the stations across channels. In this paper, we propose a simpler scheme called Splash, which is mostly built on the current 802.11 standard. The core idea of the Splash scheme is simply that whenever a pair of stations starts communication on a channel, all other stations jump to another channel next in priority. Simulation and analysis show that this simple scheme boosts the throughput by 4 to 5 times, with a larger reduction in delay.

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An integrated cmos rf synthesizer for 802.11a wireless lan

Cited by 85 publications

References 12 publications

FLUID: Improving Throughputs in Enterprise Wireless LANs through Flexible Channelization

FLUID: Improving Throughputs in Enterprise Wireless LANs through Flexible Channelization

How to Effectively Use Multiple Channels in Wireless Mesh Networks

SPLASH: A Simple Multi-Channel Migration Scheme for IEEE 802.11 Networks

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