# IET Communications

## Filter Results

Displaying Results 1 - 14 of 14
• ### Optimisation of multi-channel cooperative sensing in cognitive radio networks

Publication Year: 2013, Page(s):1177 - 1190
| | PDF (775 KB)

Cooperative spectrum sensing (CSS) is a promising technique in cognitive radio networks (CRNs) that utilises multi-user diversity to mitigate channel instability and noise uncertainty. In this study, the relationship between cooperation mechanisms' and spatial-spectral diversity' over multiple channels jointly sensing is investigated in the presence of an imperfect reporting channel. The multipl... View full abstract»

• ### Performance analysis and power allocation for full-rate and full-diversity signal space cooperative communications

Publication Year: 2013, Page(s):1191 - 1201
Cited by:  Papers (1)
| | PDF (734 KB)

Signal space cooperative (SSC) system is bandwidth and energy efficient, which can achieve full-rate and full-diversity simultaneously. In this study, the authors first derive accurate bit error rate (BER) of the SSC system with maximum-likelihood detection (MLD), low-complexity linear detection (LD) and combined MLD and LD (MLD&LD). Specifically, closed-form BER expressions for the three dete... View full abstract»

• ### Graph-based low complexity detection algorithms in multiple-input-multiple-out systems: an edge selection approach

Publication Year: 2013, Page(s):1202 - 1210
Cited by:  Papers (3)
| | PDF (623 KB)

In this study, the problem of low complexity multiple-input-multiple-out signal detection based on belief propagation (BP) is addressed. The authors propose an edge selection approach that works on factor graph model to cut down the number of circles and high complexity of standard BP algorithm. The message passing from factor nodes to variable nodes is updated by only partial edges, and the mean ... View full abstract»

• ### Performance and throughput analysis of turbo decoder for the physical layer of digitalvideo-broadcasting-satellite-services-tohandhelds standard

Publication Year: 2013, Page(s):1211 - 1220
Cited by:  Papers (1)
| | PDF (1409 KB)

In this study, coding performance of turbo decoder compliant to the physical layer of digital-video-broadcasting-satellite-services-to-handhelds (DVB-SH) standard for additive-white-Gaussian-noise (AWGN) and frequency selective fading channels are presented. The modulation of transmitted bits is carried out with orthogonal-frequency-division-multiplexing (OFDM) technique, incorporating 1 K-fast-Fo... View full abstract»

• ### Combined power control and link selection in deviceto-device enabled cellular systems

Publication Year: 2013, Page(s):1221 - 1230
Cited by:  Papers (6)
| | PDF (426 KB)

Device-to-device (D2D) communication underlaying cellular systems is proposed to support short-range data-intensive services. In a D2D-enabled system, a closely located user pair is allowed to communicate over a direct data link, instead of being relayed through the network. In this study, based on the power control framework in traditional cellular networks, a combined power control and link sele... View full abstract»

• ### How to understand linear minimum mean-square-error transceiver design for multiple-input-multiple-output systems from quadratic matrix programming

Publication Year: 2013, Page(s):1231 - 1242
Cited by:  Papers (21)
| | PDF (387 KB)

In this study, a unified linear minimum mean-square-error (LMMSE) transceiver design framework is investigated, which is suitable for a wide range of wireless systems. The unified design is based on an elegant and powerful mathematical programming technology termed as quadratic matrix programming (QMP). Based on QMP it can be observed that for different wireless systems, there are certain common c... View full abstract»

• ### Design of efficient full-rate linear dispersion spacetime block codes over correlated fading channels

Publication Year: 2013, Page(s):1243 - 1253
Cited by:  Papers (4)
| | PDF (905 KB)

In this study, the authors present a method to design efficient full-rate linear dispersion space-time block codes (LD-STBCs) in correlated Rayleigh fading channels with simple detection at the receiver. The authors first derive a formula for the achievable capacity of an LD-STBC coded multi-input multiple-output (MIMO) system as a function of correlation at the transmitter and the receiver. Moreo... View full abstract»

• ### Exact outage analysis of underlay cooperative cognitive networks over Nakagami-mfading channels

Publication Year: 2013, Page(s):1254 - 1262
Cited by:  Papers (4)
| | PDF (258 KB)

This paper studies the outage performance behaviour of underlay cooperative cognitive networks over Nakagami-m fading channels. For time savings in collecting simulation results, the authors propose a new outage probability expression. Notably, this expression is quite general, taking into account practical operation conditions such as interference power constraint, maximum transmit power c... View full abstract»

• ### Capacity of multiple beamformed spatial stream transmission in millimetre-wave communication channels

Publication Year: 2013, Page(s):1263 - 1268
| | PDF (546 KB)

This study deals with the study on the performance of the hybrid transmission scheme combining both beamforming and spatial multiplexing for multiple spatial streams. The capacity of the hybrid scheme is evaluated and compared with that of the beamforming scheme for a single spatial stream in both line-of-sight and multi-path channels. Two kinds of hybrid schemes are considered: the shared antenna... View full abstract»

• ### Fast and efficient parallel-shift water-filling algorithm for power allocation in orthogonal frequency division multiplexing-based underlay cognitive radios

Publication Year: 2013, Page(s):1269 - 1278
Cited by:  Papers (2)
| | PDF (766 KB)

Water-Filling (WF) is widely applied in power allocation in multichannel wireless communications. By mathematically linearising the optimal WF expression, the authors observe an intrinsic parallel-shift property of WF, based on which a fast and efficient WF algorithm is proposed. Compared with the conventional WF algorithms, it greatly simplifies WF execution by removing the Lagrange multiplier (o... View full abstract»

• ### Optimal power allocation for green cognitive radio: fractional programming approach

Publication Year: 2013, Page(s):1279 - 1286
Cited by:  Papers (13)
| | PDF (766 KB)

In this study, the problem of determining the power allocation that maximises the energy efficiency of cognitive radio network is investigated as a constrained fractional programming problem. The energy-efficient fractional objective is defined in terms of bits per Joule per Hertz. The proposed constrained fractional programming problem is a non-linear non-convex optimisation problem. The authors ... View full abstract»

• ### Phase compensation communication technique against time reversal for ultra-wideband channels

Publication Year: 2013, Page(s):1287 - 1295
Cited by:  Papers (4)
| | PDF (652 KB)

Phase compensation (PC) prefiltering is experimentally investigated for multipath channels over the frequency band spanning 2-12 GHz, a topic which to the best of the authors knowledge has not been studied in the literature on ultra-wideband (UWB) communications. The authors emphasis is to assess the capabilities of PC compared to time reversal (TR) prefilters over indoor UWB channels regarding mu... View full abstract»

• ### Hierarchical modulated quadrature amplitude modulation with signal space diversity and maximal ratio combining reception in Nakagami-m fading channels

Publication Year: 2013, Page(s):1296 - 1303
Cited by:  Papers (1)
| | PDF (830 KB)

This study combines hierarchical modulation with signal space diversity (SSD) to present an unequal error protection scheme with improved bit-error rate (BER) performance for single as well as multiple antenna reception by employing maximal ratio combing in Nakagami-m fading channels. The optimal rotation angles for different constellation priority parameter α are derived. A t... View full abstract»

• ### Intrusion damage assessment for multi-stage attacks for clouds

Publication Year: 2013, Page(s):1304 - 1315
| | PDF (656 KB)

Clouds represent a major paradigm shift from contemporary systems, inspiring the contemporary approach to computing. They present fascinating opportunities to address dynamic user requirements with the provision of flexible computing infrastructures that are available on demand. Clouds, however, introducing novel challenges particularly with respect to security that require dedicated efforts to ad... 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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