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IET Communications

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Displaying Results 1 - 12 of 12
• Multiuser detectors for band-limited directsequence code-division multiple-access systems with multitone jamming and generalised-K fading

Publication Year: 2010, Page(s):2021 - 2031
Cited by:  Papers (1)
| | PDF (483 KB)

In this study, the authors analyse the bit-error rate (BER) performance of band-limited direct-sequence code-division multiple-access (DS-CDMA) systems employing two types of multiuser detectors, namely, linear decorrelator with whitening (LDW) and linear minimum mean-squared error (MMSE) detector over frequency-selective multipath channels with multitone jamming (MTJ). The authors consider the ge... View full abstract»

• Sum rate analysis of multiantenna multiuser relay channel

Publication Year: 2010, Page(s):2032 - 2040
Cited by:  Papers (2)
| | PDF (308 KB)

In this study, the authors introduce two types of relay operations such as a half-duplex relay (HDR) and a full-duplex relay (FDR) and analyse the corresponding sum rate of a multiantenna multiuser relay system. Especially for FDR, a precoding scheme based on block diagonalisation (BD) is proposed to suppress the self-interference as well as to support multiple users at the same time slot. Simulat... View full abstract»

• Sub-optimal decentralised control algorithms for blanket and k-barrier coverage in autonomous robotic wireless sensor networks

Publication Year: 2010, Page(s):2041 - 2057
Cited by:  Papers (8)
| | PDF (1432 KB)

This research aims to propose a novel sub-optimal decentralised blanket coverage control algorithm, namely, one-Barrier-to-Blanket Coverage Algorithm (BBCA) as well as a novel k-barrier coverage control algorithm, namely, `one-to-k Barrier Coverage Algorithm' (1-kBCA) for self-deployed autonomous wireless sensor networks in the obstacle-free and convex deployment area. The motion c... View full abstract»

• Spectral efficiency of adaptive transmission and selection diversity on generalised fading channels

Publication Year: 2010, Page(s):2058 - 2064
Cited by:  Papers (4)
| | PDF (289 KB)

The spectral efficiency of L-branch selection diversity (SD) receiver with different adaptive transmission techniques operating over generalised-Gamma (GG) fading channels is studied. Novel expressions for important adaptive transmission techniques are obtained, namely optimal power and rate adaptation, optimal rate adaptation, channel inversion with fixed rate (CIFR) and truncated CIFR. Furthermo... View full abstract»

• Tone reservation technique based on geometric method for orthogonal frequency division multiplexing peak-to-average power ratio reduction

Publication Year: 2010, Page(s):2065 - 2073
Cited by:  Papers (6)
| | PDF (312 KB)

Orthogonal frequency division multiplexing (OFDM), has recently attracted considerable attention because of its features to combat delay spread or frequency selective fading of wireless or wireline channels. One of the major drawbacks of OFDM is the peak-to-average power ratio (PAPR) which leads to an inefficient use of high power amplifiers (HPA) in communications systems. The authors first brief... View full abstract»

• Cooperative game theoretic online routing scheme for wireless network managements

Publication Year: 2010, Page(s):2074 - 2083
Cited by:  Papers (2)
| | PDF (649 KB)

During wireless network operations, a widely used performance issue is energy efficiency. Along with the energy efficiency, another desirable property is load balancing. In this study, a new integrated routing scheme is proposed; it is composed of path setup and packet distribution algorithms. Owing to the online self-adjustment technique, the path setup algorithm can adaptively estimate link cost... View full abstract»

• Enhanced intrusion detection system for malicious node detection in ad hoc routing protocols using minimal energy consumption

Publication Year: 2010, Page(s):2084 - 2094
Cited by:  Papers (5)
| | PDF (864 KB)

An ad hoc network is the assortment of cooperative wireless nodes without existence of any access point or infrastructure. Many ad hoc network routing protocols have been proposed in the literature. However, none of them deal with the issues of security. The presence of malicious nodes in an ad hoc network deteriorates the network performance. A novel approach for enhanced intrusion detection syst... View full abstract»

• Channel estimation in bit-interleaved coded modulation with iterative decoding

Publication Year: 2010, Page(s):2095 - 2103
Cited by:  Papers (2)
| | PDF (278 KB)

This study improves the fading channel estimation in bit-interleaved coded modulation systems with iterative decoding (BICM-ID) and signal space diversity (SSD) by embedding a training sequence. Existing training schemes work well at high signal-to-noise ratio (SNR) or slowly time-varying channels whereas the applications of BICM-ID are beneficial at low SNR and fast time-varying fading channels. ... View full abstract»

• Channel estimation of pulse-shaped multiple-input multiple-output orthogonal frequency division multiplexing systems

Publication Year: 2010, Page(s):2104 - 2114
Cited by:  Papers (3)
| | PDF (266 KB)

Most of the existing multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) channel estimation methods do not take into account the effect of the pulse-shaping filter in the transmitter nor of the matched filter in the receiver, thus leading to an estimation solution for the composite channel including the pulse-shaping and matched filters, instead of the pure wirele... View full abstract»

• Early stopping turbo decoders: a high-throughput, low-energy bit-level approach and implementation

Publication Year: 2010, Page(s):2115 - 2124
Cited by:  Papers (5)
| | PDF (561 KB)

This study presents the design for a new bit-level early stopping algorithm that can be considered as an improvement of the block-level sign-change-ratio-based early stopping approach for high-speed turbo decoding applications. Conventional early stopping methods provide limited improvements in throughput/energy efficiency but result in decoding accuracy degradations. By identifying agreement of t... View full abstract»

• Dynamic spectrum sharing in orthogonal frequency division multiple access - based cognitive radio

Publication Year: 2010, Page(s):2125 - 2132
| | PDF (381 KB)

In this study, a secondary network is underlaid in a conventional downlink orthogonal frequency division multiple access (OFDMA) system to formulate a new implementation of cognitive radio, where spectrum sharing is enabled to improve spectrum utilisation. This implementation is applicable to the scenario when the number of active users is larger than the number of subcarriers, which usually canno... View full abstract»

• Relay assignment and cooperation maintenance in wireless networks: a game theoretical approach

Publication Year: 2010, Page(s):2133 - 2144
Cited by:  Papers (4)
| | PDF (634 KB)

In this study, the authors study the relays assignment problem in cooperative wireless networks with self-interested nodes. The authors propose a cooperation mechanism which includes the cooperative relationship formation stage and cooperation maintenance stage. The cooperative relationship among the nodes can be modelled as an exchange market game where nodes trade transmission power between each... View full abstract»

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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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