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# IET Communications

## Filter Results

Displaying Results 1 - 10 of 10
• ### Measurement-based analysis of cross-layer adaptation for MIMO in mobile urban environments

Publication Year: 2013, Page(s):697 - 705
| | PDF (843 KB)

The performance of mobile multiple-input-multiple-output (MIMO) systems is determined both by the instantaneous channel characteristics and by the rate of change of those characteristics. The local environment and operating frequency affect the spatial channel response, which impacts the ability of the system to sustain data throughput, while the dynamics of the channel response impact the accurac... View full abstract»

• ### Successive orthogonal beamforming for cooperative multi-point downlinks

Publication Year: 2013, Page(s):706 - 714
| | PDF (732 KB)

This study considers successive orthogonal beamforming (SOBF) for multicell downlink transmissions. A group of base stations (BSs) are in cooperation for effective downlink transmissions to cell-edge users, which is usually referred to as cooperative multi-point. As the number of cell-edge users is small and varying, conventional beamforming schemes, for example, zero-forcing beamforming (ZFBF), a... View full abstract»

• ### Integer linear programming model and satisfiability test reduction for distance constrained labellings of graphs: the case of L(3,2,1)labelling for products of paths and cycles

Publication Year: 2013, Page(s):715 - 720
| | PDF (576 KB)

Let u and v be vertices of a graph G = (V, E) and d(u, v) be the distance between u and v in G. For positive integers k1, k2, ..., kn with $k_1 gt k_2 gt cdots gt k_n$k1>k2>⋯>kn an L(k1, ... View full abstract»

• ### Physical-layer transceiving techniques on data-aided orthogonal frequency-division multiplexing towards seamless service on vehicular communications

Publication Year: 2013, Page(s):721 - 730
| | PDF (831 KB)

Frequency error, non-ideal channel estimation (CE) and inefficient seamless road side unit (RSU) service are critical issues occurring in conventional systems that are completely specified by current IEEE 802.11p standards. This study investigates novel techniques for achieving accurate frequency offset compensation and effective CE and RSU selection for handover in signal-overlapping areas. Recen... View full abstract»

• ### Secondary user access based on stochastic link estimation in cognitive radio with fibre-connected distributed antennas

Publication Year: 2013, Page(s):731 - 737
Cited by:  Papers (1)
| | PDF (328 KB)

In this study, the authors consider the application of a system architecture called cognitive radio (CR) with fibre-connected distributed antennas in IEEE 802.22 wireless regional area networks (WRANs) as it could bring the benefits of much shorter wireless transmission distances, lower transmission power and the possibility of utilising multi-antenna transmission techniques. In this architecture,... View full abstract»

• ### Effect of avalanche photodiode and thermal noises on the performance of binary phase-shift keyingsubcarrier-intensity modulation/free-space optical systems over turbulence channels

Publication Year: 2013, Page(s):738 - 744
Cited by:  Papers (7)
| | PDF (560 KB)

In this study, the authors theoretically study the performance of direct-detection free-space optical communication systems using binary phase-shift keying subcarrier-intensity modulation and avalanche photodiode (APD). The system bit-error rate and channel capacity are theoretically derived in cases of log-normal and gamma-gamma channel models for weak-to-moderate and moderate-to-strong atmospher... View full abstract»

• ### Capacity analysis of Rayleigh fading channels in low signal-to-noise ratio regime for maximal ratio combining diversity because of combining errors

Publication Year: 2013, Page(s):745 - 754
| | PDF (868 KB)

In this research work, the authors derive closed-form expressions for capacity per unit bandwidth (spectrum efficiency) of correlated Rayleigh fading channels under maximal ratio combining diversity at low signal-to-noise ratios (SNRs). Spectrum efficiency expressions are derived for M diversity branches under adaptation policies, such as: (i) optimal power and rate adaptation (OPRA) policy, (ii) ... View full abstract»

• ### Spatially-coupled communication system for the correlated erasure channel

Publication Year: 2013, Page(s):755 - 765
Cited by:  Papers (1)
| | PDF (687 KB)

Low implementation complexity, low delay and close-to-optimal performance over a wide variety of channels are some of the advantages of spatially-coupled low-density parity-check (LDPC) codes. However, the error performance of the sliding window decoding scheme that is used to decode these codes is considerably degraded over channels with memory, such as the correlated erasure channel. Employing a... View full abstract»

• ### Estimating communication costs for distributed XML query processing

Publication Year: 2013, Page(s):766 - 773
| | PDF (668 KB)

In distributed query processing, good estimation algorithms of communication costs are critical for query processing, including distributed XML queries. There are techniques that estimate a communication cost for distributed SQL query processing, and some of techniques are adopted in numerous distributed SQL processors. Therefore adopting the processing techniques for SQL queries for the communica... View full abstract»

• ### Low-complexity selected mapping scheme using cyclic-shifted inverse fast Fourier transform for peak-to-average power ratio reduction in orthogonal frequency division multiplexing systems

Publication Year: 2013, Page(s):774 - 782
| | PDF (763 KB)

In this study, a new peak-to-average power ratio (PAPR) reduction scheme for orthogonal frequency division multiplexing (OFDM) is proposed based on the selected mapping (SLM) scheme. The proposed SLM scheme generates alternative OFDM signal sequences by cyclically shifting the connections in each subblock at an intermediate stage of inverse fast Fourier transform (IFFT). Compared with the conventi... 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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