# IET Communications

## Filter Results

Displaying Results 1 - 12 of 12
• ### Learning models for video quality prediction over wireless local area network and universal mobile telecommunication system networks

Publication Year: 2010, Page(s):1389 - 1403
Cited by:  Papers (8)
| | PDF (864 KB)

Universal mobile telecommunication system (UMTS) is a third-generation mobile communications system that supports wireless wideband multimedia applications. The primary aim of this study is to present learning models based on neural networks for objective, non-intrusive prediction of video quality over wireless local area network (WLAN) and UMTS networks for video applications. The contributions o... View full abstract»

• ### Distributed water-filling algorithm for direct-sequence ultra wideband cognitive radio network with limit on aggregate power emission

Publication Year: 2010, Page(s):1404 - 1414
Cited by:  Papers (1)
| | PDF (434 KB)

Despite their near-noise power emission, ultra wideband (UWB) radios, particularly direct-sequence ultra wideband (DS-UWB), are still possible to cause harmful interference to legacy radio systems. When they participate in a large dense cognitive radio network (CRN) and transmit simultaneously, their joint power emission would be disastrous if without control. We address this problem by imposing a... View full abstract»

• ### Congestion control for streaming service in IEEE 802.11 multihop networks

Publication Year: 2010, Page(s):1415 - 1422
Cited by:  Papers (1)
| | PDF (264 KB)

The existing congestion control algorithms for streaming service experience the performance degradation over IEEE 802.11 multihop network because they mainly focus on the prevention of the buffer overflow at the specific node. However, congestion collapse happens not because of the buffer overflow but because of the serious contention at multiple nodes. As the MAC layer contention becomes serious,... View full abstract»

• ### Outage analysis of relay-assisted free-space optical communications

Publication Year: 2010, Page(s):1423 - 1432
Cited by:  Papers (21)
| | PDF (381 KB)

Despite their attractive features, free-space optical (FSO) communications suffer from several challenges in practical deployment; the major of them is fading or scintillation. To overcome such limitations, multiple input multiple output (MIMO) and cooperative techniques have been proposed. Although the promising effects of cooperative transmissions in radio frequency (RF) communications have grea... View full abstract»

• ### Reduction of out of band radiation using carrier-by-carrier partial response signalling in orthogonal frequency division multiplexing

Publication Year: 2010, Page(s):1433 - 1442
Cited by:  Papers (1)
| | PDF (759 KB)

Orthogonal frequency division multiplexing (OFDM) is a mature and one of the most popular multicarrier modulation (MCM) techniques. Also, it is the main candidate for physical layer of cognitive radio (CR) networks. CR is a new method to satisfy ubiquitous demand for wireless services while there is no enough unlicensed spectrum. However, the most important shortcoming of OFDM-based CR systems is ... View full abstract»

• ### Inter-subcarrier interference compensation in the frequency-hopped single-carrier frequency division multiple access communication system

Publication Year: 2010, Page(s):1443 - 1451
Cited by:  Papers (1)  |  Patents (2)
| | PDF (862 KB)

Single-carrier frequency division multiple access (SC-FDMA) system having very good characteristic on peak-to-average power ratio is promising in communication area. But the performance of SC-FDMA system is very sensitive to inter-subcarrier interference (ICI), and existing phase noise suppression algorithm has reduced just phase noise only. Therefore the authors propose effective method, phase no... View full abstract»

• ### Block QR decomposition and near-optimal ordering in intercell cooperative multiple-input multiple-output-orthogonal frequency division multiplexing

Publication Year: 2010, Page(s):1452 - 1462
Cited by:  Papers (13)
| | PDF (830 KB)

Here, the authors investigate dirty paper coding (DPC) in intercell cooperative multiple-input multiple-output-orthogonal frequency division multiplexing (MIMO-OFDM). Based on the multidimensional structure of intercell cooperative MIMO-OFDM, the DPC model has been modified by introducing a block QR decomposition (BQRD) algorithm which transforms the multiuser channel to a block lower triangular s... View full abstract»

• ### Utility-based resource allocation in orthogonal frequency division multiple access networks

Publication Year: 2010, Page(s):1463 - 1470
Cited by:  Papers (6)
| | PDF (399 KB)

The authors consider network utility maximisation problem in orthogonal frequency division multiple access (OFDMA) networks to study cross-layer, fair and efficient resource allocation. Assuming knowledge of the instantaneous channel gains, this problem is decomposed into rate control and scheduling problems at the transport and medium access control/physical layers, respectively. In contrast to t... View full abstract»

• ### Linear quadrature optimisation-based non-coherent time of arrival estimation scheme for impulse radio ultra-wideband systems

Publication Year: 2010, Page(s):1471 - 1483
| | PDF (506 KB)

Owing to the extremely high-time resolution of impulse radio ultra-wideband (IR-UWB), time of arrival (TOA) estimation has been an important and tempting issue of this technology ever since its emergence. Conventional TOA estimation (TOAE) schemes require prohibitively high sampling rate and a priori knowledge of the received signal, and hence render a practical implementation rigorous or even inf... View full abstract»

• ### Multi-source multi-destination relay network: constrained optimisation for higher diversity

Publication Year: 2010, Page(s):1484 - 1494
| | PDF (482 KB)

The authors consider a cooperative communication system where multiple sources transmit data to multiple destinations, being helped by multiple half-duplex relay nodes: relay nodes perform amplify and forward as their cooperative technique, with the use of complex weights for forwarding; complex forwarding weights are optimised, based on the obtained channel information, to improve data transmis... View full abstract»

• ### Broadcast multicast capacity of network coding for random wireless networks

Publication Year: 2010, Page(s):1495 - 1503
| | PDF (359 KB)

The single-source multicast network coding (NC) capacity of random wireless networks was derived recently without incorporating broadcast property of the wireless medium. Here, capacity implications of the broadcast property are studied. It is shown that source cut (the cut that separates the source from all other nodes) still dominates the multicast NC capacity of random wireless networks incorpo... View full abstract»

• ### Alternative web caching design: a site-based approach

Publication Year: 2010, Page(s):1504 - 1515
Cited by:  Patents (2)
| | PDF (366 KB)

The existing designs and solutions for web caching systems commonly make caching decisions based on document or uniform resource locator (URL) information. While this conventional approach works, the authors deliver insights into the alternative approach using site information for web caching design. This site-based approach makes caching decisions based on the website that an object belongs to, r... View full abstract»

## Aims & Scope

IET Communications covers the theory and practice of systems, networks and applications involving line, mobile radio, satellite and optical technologies for telecommunications, and Internet and multimedia communications.

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