IEE Proceedings - Communications
Online ISSN
1359-7019
Print ISSN 1350-2425
Print ISSN 1350-2425
Published from 1994-2006, IEE Proceedings - Communications covered fundamental and generic research for a better understanding of communication technologies to harness signals for better-performing communication systems using various wired and/or wireless media. The journal contained research papers reporting novel solutions to the dominating problems of noise, interference, timing and errors, for the reduction of systems deficiencies, such as wasting scarce spectra, energy and bandwidth resources.
This journal was previously known as IEE Proceedings I (Communications, Speech and Vision) 1989-1993. ISSN 0956-3776. more..
This publication is continued by IET Communications 2007-. ISSN 1751-8628. more..
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Latest content
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Localised credit based QoS routing
- Author(s): S.H. Alabbad and M.E. Woodward
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p.
787
–796
(10)
Localised quality of service (QoS) routing has recently been proposed as a viable alternative approach to traditional QoS routing algorithms that use global state information. In this approach, problems associated with maintaining global state information are avoided by having the source nodes to infer the network QoS state based on flow blocking statistics collected locally, and perform flow routing using this localised view of the network QoS state. A credit based routing algorithm (CBR) which is a simple yet effective localised QoS routing algorithm is introduced. Its performance is compared against the localised proportional sticky routing (PSR) algorithm using different types of network topologies, QoS requirements and traffic patterns and under a wide range of traffic loads. Extensive simulations show that the algorithm outperforms the PSR scheme while maintaining the same level of adaptivity and stability. Its performance is also compared against the global widest-shortest path algorithm (WSP) and it is shown that CBR gives a comparable performance with better time complexity and very low communication overhead.
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Diversity performance of a dual-linear polarisation suspended gap-coupled microstrip antenna
- Author(s): T.S.P. See and Z.N. Chen
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p.
797
–801
(5)
The diversity performance of a dual-linear polarisation microstrip antenna is investigated across the broad operating bandwidth. As an example, the suspended gap-coupled microstrip antenna has been chosen for the study. Using a ±45° polarisation scheme, the probe-fed square main patch, surrounded by four parasitic patches on its radiating and non-radiating sides, is suspended above the ground plane. The simulated and measured impedance as well as the radiation performance are given. The diversity performance is evaluated in terms of the far-field coupling, output power correlation as well as the diversity gain in a non-fading channel. From the analysis performed at three primary frequencies, the diversity performance has been found to vary across the impedance bandwidth. It is shown that other than the environment, the radiation characteristics of the antenna have a considerable effect on the diversity gain.
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Multiuser MIMO-OFDM systems using subcarrier hopping
- Author(s): M. Jiang and L. Hanzo
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p.
802
–809
(8)
Recently space division multiple access (SDMA) assisted multiple-input–multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems invoking multiuser detection (MUD) techniques have attracted substantial research interest, which is capable of exploiting both transmitter multiplexing gain and receiver diversity gain. A new scheme referred to here as slowsubcarrierhopping (SSCH) assisted multiuser SDMA-OFDM, is proposed. It is shown that, with the aid of the so-called uniform SSCH (USSCH) pattern, the multiuser interference (MUI) experienced by the high-throughput SDMA-OFDM system can be effectively suppressed, resulting in a significant performance improvement. In the investigations conducted, the proposed USSCH-aided SDMA-OFDM system was capable of outperforming a range of SDMA-OFDM systems considered, including the conventional SDMA-OFDM system dispensing with the employment of frequency-hopping techniques. For example, at an Eb/N0 value of 12 dB, the proposed USSCH/SDMA-OFDM system reduced the bit error ratio (BER) by about three orders of magnitude, in comparison to the conventional SDMA-OFDM system, while maintaining a similar computational complexity.
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GPRS/UMTS-aided authentication protocol for wireless LANs
- Author(s): Y.-M. Tseng
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p.
810
–817
(8)
Wireless local area network (WLAN) and cellular network are two important technologies for providing wireless communications. For user authentication of WLAN, the IEEE 802.1X standard provides an authentication framework that is based on the Extensible Authentication Protocol (EAP). When a roaming user wants to access WLANs provided by different operators, the user must remember multiple identities and the corresponding authentication credentials. Obviously, such an exercise is not user friendly. This problem is caused by the fact that a visited WLAN does not have the authentication credential of a roaming user. Previous proposals have studied the authentication of inter-network roaming across different WLANs, or across a cellular network and a WLAN. As is known, cellular networks provide wider service areas, ‘always-on’ and ubiquitous connectivity. The integration of WLAN and cellular networks has a management advantage that it can unify the subscriber identity and the corresponding credential. In this paper, we first propose a practical certificate distribution scheme. The certificate distribution scheme allows roaming users of a cellular network to obtain temporary certificates from their home cellular network. Afterward adopting certificate-based authentication protocol of the IEEE 802.1X standard, roaming users may use temporary certificates to access WLANs. The proposed solution achieves easy subscriber management and pervasive access. As demonstrated, the proposed solution also provides mutual authentication and strong identity protection, in addition to withstanding the man-in-the-middle attack and the eavesdropping attack. A performance evaluation shows that the proposed protocol is well suited for roaming users with mobile devices.
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Reducing the peak-to-average power ratio using turbo coding
- Author(s): M. Al-Akaidi and O. Daoud
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p.
818
–821
(4)
Owing to the susceptibility to the peak-to-average power ratio (PAPR) on orthogonal frequency division multiplexing (OFDM) systems, the authors introduce a novel approach based on turbo coding to improve OFDM (PAPR) performance. In the paper, it is shown that even for different types of modulation methods and coding rates, the technique is still applicable and gives better performance comparing to the conventional techniques being used (such as the clipping technique and the partial transmit sequence (PTS) technique).
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