# IET Communications

## Filter Results

Displaying Results 1 - 12 of 12
• ### ASA: Agent-based secure ARP cache management

Publication Year: 2012, Page(s):685 - 693
Cited by:  Papers (3)
| |PDF (731 KB)

Address resolution protocol (ARP) is widely used to maintain mapping between data link (e.g. MAC) and network (e.g. IP) layer addresses. Although most hosts rely on automated and dynamic management of ARP cache entries, current implementation is well-known to be vulnerable to spoofing or denial of service (DoS) attacks. There are many tools that exploit vulnerabilities of ARP protocols, and past p... View full abstract»

• ### Improved low-complexity transmitted reference pulse cluster for ultra-wideband communications

Publication Year: 2012, Page(s):694 - 701
Cited by:  Papers (3)
| |PDF (625 KB)

Transmitted reference pulse cluster (TRPC) signalling was recently proposed for robust low-rate ultra-wideband (UWB) communications. TRPC provides significant performance gains over conventional transmitted reference (TR) UWB, and overcomes the critical long delay line problem associated with TR UWB. Thus, it is suited for practical implementation of a UWB communication system. The compact spacing... View full abstract»

• ### Non-recursive max* operator with reduced implementation complexity for turbo decoding

Publication Year: 2012, Page(s):702 - 707
Cited by:  Papers (8)
| |PDF (337 KB)

In this study, the authors deal with the problem of how to effectively approximate the max* operator when having n >; 2 input values, with the aim of reducing implementation complexity of conventional Log-MAP turbo decoders. They show that, contrary to previous approaches, it is not necessary to apply the max* operator recursively over pairs of values. Instead, a simple, yet effective, s... View full abstract»

• ### Outage probability analysis for multiple input-multiple output ad-hoc network with quantised beamforming

Publication Year: 2012, Page(s):708 - 714
Cited by:  Papers (2)
| |PDF (580 KB)

In this study, exact closed-form expressions are derived for sum throughput/capacity and outage probability for multiple input-multiple output (MIMO) ad-hoc network with quantised beamforming and finite-rate feedback. In quantised beamforming, each receiver sends the label of the best beamforming vector obtained from the codebook to the transmitter through a finite rate limited feedback. Th... View full abstract»

• ### Unique word-based distributed space-time block codes for two-hop wireless relay networks

Publication Year: 2012, Page(s):715 - 723
Cited by:  Papers (1)
| |PDF (443 KB)

Distributed space-time block codes (DSTBCs) have been developed to exploit diversity gains in cooperative communications systems. In this paper, we propose a new DSTBC based on unique word (UW) extension, referred to as the D-UW-STBC. The D-UW-STBC is devised for wireless relay networks with the amplify-and-forward protocol and frequency selective fading channels. The data is transmitted from the ... View full abstract»

• ### Power-aware dual-tree-based multicast routing protocol for mobile ad hoc networks

Publication Year: 2012, Page(s):724 - 732
Cited by:  Papers (3)
| |PDF (494 KB)

A mobile ad hoc network (MANET) is an interconnected system of mobile hosts without a fixed infrastructure. In MANETs, each mobile host has multi-hop transmission capability, and it has to serve as a router. Owing to the dynamic topology and limited resources of mobile hosts, the routing scheme in MANETs presents an important challenge. In this study, a power-aware dual-tree-based multicast... View full abstract»

• ### Optimised balancing algorithm for content delivery networks

Publication Year: 2012, Page(s):733 - 739
Cited by:  Papers (2)
| |PDF (541 KB)

In this study the authors present the fictitiously starred optimised balancing (FSOB), a novel algorithm for load balancing in a content delivery network (CDN) scenario. FSOB exploits the multiple redirection mechanism of the HTTP protocol to optimally redistribute clients requests among the servers which build up the CDN. Load redistribution is aimed at equalising the level of occupancy of the ... View full abstract»

• ### Achieving service differentiation in IEEE 802.11e enhanced distributed channel access systems

Publication Year: 2012, Page(s):740 - 750
Cited by:  Papers (2)
| |PDF (569 KB)

The IEEE 802.11e standard allows for contention-based quality of service (QoS) provisioning using enhanced distributed channel access (EDCA). By tuning the contention parameters for EDCA, the system can adapt to changes in the network scenario. The benefits of this adaptation include the ability to maximise the system capacity while also achieving the service differentiation necessary to provide Q... View full abstract»

• ### Finite-signal-to-noise ratio diversity-multiplexing-rate trade-off in limited feedback beamforming systems with imperfect channel state information

Publication Year: 2012, Page(s):751 - 758
Cited by:  Papers (3)
| |PDF (303 KB)

The problem of diversity-multiplexing-rate trade-off (DMRT) in limited feedback beamforming systems is addressed here. A major difference from previous works is that the authors consider the trade-off in finite-signal-to-noise ratio (SNR) regime. Under this condition, the feedback rate has a great impact on the conventional diversity-multiplexing relationship. Hence, the release of the trade-off a... View full abstract»

• ### Diversity analysis for energy detection-based spectrum sensing

Publication Year: 2012, Page(s):759 - 764
| |PDF (213 KB)

In this study the authors perform a diversity analysis for an energy detection-based non-coherent spectrum sensing scheme and benchmark it against a genie aided coherent spectrum sensing scheme, which has full knowledge of the fading channel. In both cases the sensor has access to multiple independent channel observations. Results show that both schemes achieve full diversity. However, the authors... View full abstract»

• ### Performance improvement of wavelet packet transform over fast fourier transform in multiple-input multiple-output orthogonal frequency division multiplexing systems

Publication Year: 2012, Page(s):765 - 773
Cited by:  Papers (2)
| |PDF (882 KB)

This study presents a proper way to improve the multiple-input multiple-output orthogonal frequency division multiplexing (OFDM) system by proposing a new tackling method to reduce the peak-to-average power ratio (PAPR). It is attained by reconstructing the fast Fourier transform block in the OFDM based on the wavelet packet transform, called forward wavelet frequency division multiplexing. In add... View full abstract»

• ### Sounding reference signal pattern design for time division duplex multiple-input multiple-output and orthogonal frequency division multiplexing systems

Publication Year: 2012, Page(s):774 - 782
| |PDF (1286 KB)

In the long-term evolution (LTE) time division duplex (TDD) systems, base stations (BSs) use uplink sounding reference signals (SRSs) to estimate downlink channel state information (CSI) for downlink beamforming transmissions. In the current SRS pattern scheme, because SRSs of up to eight users are multiplexed on the same time-frequency resources, there exist mutual interferences among these SRSs ... 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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