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# IET Communications

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Displaying Results 1 - 14 of 14
• ### An efficient multiple access interference suppression scheme in asynchronous femtocells

Publication Year: 2013, Page(s):1439 - 1448
Cited by:  Papers (2)
| | PDF (588 KB)

This work considers a code division multiple access (CDMA)-based femtocell system where a fixed set of subscribed users communicate simultaneously to a femtocell access point (FAP) in an asynchronous fashion during the uplink. The main goal of this paper is to present an augmentation protocol for the physical layer of the CDMA2000 femtocell standard with focus on the multiple access interference (... View full abstract»

• ### Language independent on–off voice over IP source model with lognormal transitions

Publication Year: 2013, Page(s):1449 - 1455
Cited by:  Papers (1)
| | PDF (576 KB)

The recent explosive growth of voice over IP (VoIP) solutions calls for accurate modelling of VoIP traffic. This study presents measurements of ON and OFF periods of VoIP activity from a significantly large database of VoIP call recordings consisting of native speakers speaking in some of the world's most widely spoken languages. The impact of the languages and the varying dynamics of caller inter... View full abstract»

• ### Frequency-hopping signals sorting based on underdetermined blind source separation

Publication Year: 2013, Page(s):1456 - 1464
Cited by:  Papers (2)
| | PDF (1066 KB)

Most of the earlier approaches for frequency-hopping (FH) signals sorting with a single sensor do not adapt to synchronous network, whereas the multiple-sensor-based algorithms request the number of sensors must be more than that of signals. Since the number of sensors is limited in many practical applications, it is important to sort synchronous or asynchronous FH networks with as little as possi... View full abstract»

• ### Iterative source and channel decoding relying on correlation modelling for wireless video transmission

Publication Year: 2013, Page(s):1465 - 1475
Cited by:  Papers (5)
| | PDF (693 KB)

Since joint source-channel decoding is capable of exploiting the residual redundancy in the source signals for improving the attainable error resilience, it has attracted substantial attention. In this treatise, the authors study iterative source-channel decoding (ISCD) aided video communications, where the video signal redundancy is modelled by a first-order Markov process. Firstly, the authors d... View full abstract»

• ### Spectral, energy and economic efficiency of relay-aided cellular networks

Publication Year: 2013, Page(s):1476 - 1486
Cited by:  Papers (10)
| | PDF (483 KB)

The authors investigate the relay-aided multicell multiple-input-multiple-output (MIMO) cellular network by comparing both the signal forwarding and interference forwarding relaying paradigms, each employing the adaptive MIMO relay scheme. The spectral, energy and economic efficiency values are utilised as key performance metrics. Furthermore, both radio frequency and circuit power consumption are... View full abstract»

• ### Linear minimum-mean-squared error estimation of phase noise, which has a symmetric levy distribution and a possibly large magnitude, from observables at irregular instants

Publication Year: 2013, Page(s):1487 - 1496
| | PDF (296 KB)

This study extends an algorithm, previously proposed by the present authors, for linear minimum-mean-squared error' estimation of phase noise of (possibly) temporal non-stationarity, large magnitude, non'-identical increments that have a Levy distribution, of which the Wiener distribution represents a special case. This estimator-taps may be pre-set to any number, may be pre-computed offline wit... View full abstract»

• ### Optimal pre-equalisation for wireless multi-carrier code division multiple access systems under quality of service requirements

Publication Year: 2013, Page(s):1497 - 1509
Cited by:  Papers (4)
| | PDF (586 KB)

This work addresses an optimal pre-equalisation scheme to provide power and phase compensation in multi-carrier code division multiple access wireless systems under quality of service (QoS) restrictions. Two assignation schemes are studied: independent and uniform pre-equalised transmission (IPT and UPT) per subcarrier. First, the QoS was quantified in terms of the signal-to-interference noise rat... View full abstract»

• ### Location optimisation for antennas by asynchronous particle swarm optimisation

Publication Year: 2013, Page(s):1510 - 1516
Cited by:  Papers (2)
| | PDF (456 KB)

A novel optimisation procedure for the location of the transmitter in 3 × 3 multiple input multiple output wireless local area network wireless communication systems is presented. The optimal antenna location for maximising the channel capacity is searched by particle swarm optimiser (PSO) and asynchronous particle swarm optimisation (APSO). There are two different receiver locations consid... View full abstract»

• ### Adaptive-weighted multibit-flipping decoding of lowdensity parity-check codes based on ordered statistics

Publication Year: 2013, Page(s):1517 - 1521
Cited by:  Papers (2)
| | PDF (658 KB)

An adaptive-weighted multibit-flipping decoding algorithm, which flips multiple bits in each iteration, is proposed for low-density parity-check codes. The multibit-flipping criterion is devised based on the least reliable positions and ordered statistics, in which the flipping threshold is dynamically adapted during the decoding process. The proposed decoder converges faster and provides better p... View full abstract»

• ### Joint detection/decoding algorithms for non-binary low-density parity-check codes over inter-symbol interference channels

Publication Year: 2013, Page(s):1522 - 1531
Cited by:  Papers (2)  |  Patents (2)
| | PDF (951 KB)

This study is concerned with the application of non-binary low-density parity-check (NB-LDPC) codes to binary input inter-symbol interference channels. Two low-complexity joint detection/decoding algorithms are proposed. One is referred to as max-log-MAP/X-EMS algorithm, which is implemented by exchanging soft messages between the max-log-MAP detector and the extended min-sum (EMS) decoder. The ma... View full abstract»

• ### Semi-analytic selection of sub-carrier allocation schemes in uplink orthogonal frequency division multiple access

Publication Year: 2013, Page(s):1532 - 1539
| | PDF (534 KB)

The authors propose a generalised framework that analytically compares different sub-carrier allocation (SA) or sub-channelisation schemes (such as interleaved SA (ISA), localised SA (LSA) or hybrid schemes) in uplink (UL) orthogonal frequency division multiple access (OFDMA). The ultimate goal of the proposed framework is to systematically determine the best SA scheme among the considered candida... View full abstract»

• ### Multiple-input–multiple-output channel modelling using multi-layer perceptron with finite impulse response and infinite impulse response synapses

Publication Year: 2013, Page(s):1540 - 1549
Cited by:  Papers (1)
| | PDF (641 KB)

Multiple-input-multiple-output (MIMO) wireless technology is a viable option likely to be able to meet the demands of the ever-expanding mobile networks. For MIMO system, channel estimation is still a challenging area due to several difficulties. Soft-computational approaches can be additions to the list of traditional methods of MIMO channel modelling primarily because these tools, for their abil... View full abstract»

• ### Asymptotic throughput analysis of random beamforming for multi-antenna cognitive broadcast networks

Publication Year: 2013, Page(s):1550 - 1556
| | PDF (422 KB)

Random beamforming (RBF) has received much attention recently in downlink beamforming because of its simple structure, low-feedback load and same throughput scaling as that obtained using dirty paper coding at the transmitter. In this study, the authors analyse the performance of RBF for cognitive downlink multi-antenna system in terms of the throughput of the secondary network. The authors consid... View full abstract»

• ### Relay selection with outdated channel state information in cooperative communication systems

Publication Year: 2013, Page(s):1557 - 1565
Cited by:  Papers (2)
| | PDF (792 KB)

Relay selection has been considered as an effective method to improve the performance of cooperative communication. However, the channel state information (CSI) used in relay selection can be outdated, yielding severe performance degradation of cooperative communication systems. In this study, the authors investigate how to select relays under outdated CSI in an amplify-and-forward cooperative com... 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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