By Topic

# IET Communications

## Filter Results

Displaying Results 1 - 12 of 12
• ### Promising performance of a frequency-modulated differential chaos shift keying ultra-wideband system under indoor environments

Publication Year: 2010, Page(s):125 - 134
Cited by:  Papers (27)
| | PDF (881 KB)

In this study, the performance of the frequency-modulated differential chaos shift keying (FM-DCSK) ultra-wideband (UWB) system is evaluated through two important system parameters, the guard interval and the integration interval of the integrator, over indoor communication channels. It is found that the existing FM-DCSK UWB system suffers severe performance degradation in the IEEE 802.15.4a low-r... View full abstract»

• ### Concatenated coded modulation techniques and orthogonal space-time block codes in the presence of fading channel estimation errors

Publication Year: 2010, Page(s):135 - 143
Cited by:  Papers (1)
| | PDF (511 KB)

Performance of coding and modulation systems in fading channels is usually analysed under the assumption that the receiver has perfect knowledge of channel condition. However, various shortcomings in practical channel estimation techniques lead to imperfections, resulting in channel estimation errors. The authors analyse a practical coding and modulation scheme for multiple-antenna systems conside... View full abstract»

• ### Fast method for precoding and decoding of distributive multi-input multi-output channels in relay-based decode-and-forward cooperative wireless networks

Publication Year: 2010, Page(s):144 - 153
Cited by:  Papers (5)  |  Patents (1)
| | PDF (268 KB)

It is well-known that the performance of the relay-based decode-and-forward (DF) cooperative networks outperforms the performance of the amplify-and-forward cooperative networks. However, this performance improvement is accomplished at the expense of adding more signal processing complexity (precoding/decoding) at each relay node. In this study, the authors tackle this signal processing complexity... View full abstract»

• ### Hybrid detectors for wireless orthogonal frequency division multiplexing with code division multiplexing systems based on reliability information

Publication Year: 2010, Page(s):154 - 166
| | PDF (1597 KB)

Orthogonal frequency division multiplexing with code division multiplexing (OFDM-CDM) is attractive for the next generation high-speed wireless systems due to the fact that the performance of OFDM-CDM systems can be considerably improved by employing a joint detection scheme such as the maximum likelihood (ML) detector. However, the complexity of the ML detector increases rapidly as the number of ... View full abstract»

• ### Distributed K-coverage self-location estimation scheme based on Voronoi diagram

Publication Year: 2010, Page(s):167 - 177
Cited by:  Papers (8)
| | PDF (735 KB)

The success of many wireless sensor network (WSN) applications, such as moving target tracking or environment monitoring, is dependent upon achieving k-coverage' of the sensed area, that is every point in the surveillance area is monitored by at least k sensors. This study presents a novel distributed self-location estimation scheme based on a Voronoi diagram to achieve k-cov... View full abstract»

• ### Design of robust adaptive frequency hopping for wireless medical telemetry systems

Publication Year: 2010, Page(s):178 - 191
Cited by:  Papers (4)
| | PDF (908 KB)

The authors propose an adaptive frequency hopping (AFH) algorithm, entitled robust adaptive frequency hopping (RAFH), for providing increased reliability of a wireless medical telemetry system (WMTS) under coexistence environment with non-medical devices. The conventional AFH scheme classifies channels into good or bad according to the threshold-based onoff decision by packet error rate (PER)... View full abstract»

• ### Parallel reconfigurable decoder architectures for rotation LDPC codes

Publication Year: 2010, Page(s):192 - 200
Cited by:  Papers (2)
| | PDF (726 KB)

This study presents a partial-parallel decoder architecture for ??-rotation low-density parity-check (LDPC) codes, which have regular rotation structure and linear time encoding architecture. One improved construction method, which deletes one parity-check bit corresponding to the actually redundant weight-1 column, is proposed, and then an effective encoding algorithm, which utilises only the ind... View full abstract»

• ### Bandwidth selective filter for the pre-excision of narrowband interference in broadband beamformers

Publication Year: 2010, Page(s):201 - 212
Cited by:  Papers (1)
| | PDF (472 KB)

A novel frequency domain excision filter for use in front of broadband adaptive beamformer systems is presented. The proposed frequency domain excision filter uses image processing techniques to determine the excision threshold such that only narrowband interference is removed from the received signal. By pre-excising the received signal of narrowband interference the adaptive beamformer only has ... View full abstract»

• ### Effect of number of sub-carriers, cyclic prefix and analogue to digital converter parameters on coherent optical orthogonal frequency division multiplexing modem's transmission performance

Publication Year: 2010, Page(s):213 - 222
Cited by:  Papers (2)
| | PDF (756 KB)

The number of sub-carriers, cyclic prefix (CP), and the characteristics of the analogue to digital converter (ADC), are significant parameters influencing the transmission capacity and distance of an optical orthogonal frequency division multiplexing (OOFDM) modem. Numerical simulations of coherent OOFDM modems are undertaken to investigate the effect of the number of sub-carriers, the CP length a... View full abstract»

• ### Gradient projection decoding of LDPC codes and algorithmic variations

Publication Year: 2010, Page(s):223 - 233
| | PDF (1177 KB)

The current study proposes decoding algorithms for low density parity check codes (LDPC), which offer competitive performance-complexity trade-offs relative to some of the most efficient existing decoding techniques. Unlike existing low-complexity algorithms, which are essentially reduced complexity variations of the classical belief propagation algorithm, starting point in the developed algorithm... View full abstract»

• ### Design of multi-rate optical code paths considering polarisation mode dispersion limitations

Publication Year: 2010, Page(s):234 - 239
Cited by:  Papers (2)
| | PDF (451 KB)

The authors propose an original design based on multi-rate optical code paths (OCPs) for transport in advanced wavelength-division multiplexing/optical code division multiplexing (WDM/OCDM) networks. The authors utilise multi-length optical orthogonal codes (OOC) to obtain multi-rate OCPs. The performance of the proposed scheme is analysed and the impact of multiple access interference (MAI) and p... View full abstract»

• ### Combined methodology for measurement of available bandwidth and link capacity in wired packet networks

Publication Year: 2010, Page(s):240 - 252
Cited by:  Papers (10)  |  Patents (2)
| | PDF (407 KB)

Accurate measurement of network parameters such as available bandwidth (ABW), link capacity, delay, packet loss and jitter are used to support and monitor several network functions, for example traffic engineering, quality-of-service (QoS) routing, end-to-end transport performance optimisation and link capacity planning. However, proactive network measurement schemes can impact both the data traff... 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.

Full Aims & Scope

## Meet Our Editors

IET Research Journals
iet_com@theiet.org