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Dive into the research topics where Iain Scott is active.

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Featured researches published by Iain Scott.


Wireless Personal Communications | 2000

An FFT-Based Approach for Fast Acquisition in Spread Spectrum Communication Systems

Sascha Marcus Spangenberg; Iain Scott; Stephen McLaughlin; G.J.R. Povey; D.G.M. Cruickshank; Peter Grant

This paper describes a non-coherent technique forfast acquisition of direct sequence spread spectrum(DS/SS) signals in low earth orbit (LEO) satellitecommunication scenarios. Large Doppler offsets areinherent to such environments and are likely to causemajor problems during the code acquisition phase dueto the introduced frequency ambiguity. In the presentpaper we discuss the use of a set of partialcorrelators for code phase acquisition, combined witha fast Fourier transform (FFT) for the purpose of simultaneous Doppler estimation. We will show that theuse of this architecture largely accelerates thesynchronisation process compared to conventionaltechniques over a wide range of Doppler offsets.Furthermore we discuss the implementation of azero-padded FFT that increases the frequencyresolution to such an extent, that acquisition timesidentical to scenarios without existing Doppler offsetcan be achieved.


international symposium on spread spectrum techniques and applications | 1998

Doppler estimation for fast acquisition in spread spectrum communication systems

Peter Grant; Sascha Marcus Spangenberg; Iain Scott; Steve McLaughlin; G.J.R. Povey; D.G.M. Cruickshank

This paper describes a non-coherent technique which employs a fast Fourier transform (FFT) for the fast acquisition of direct sequence spread spectrum signals in the presence of large Doppler shifts. The application of an FFT to code acquisition results in decreased acquisition time and can improve the probability of detection. The technique discussed in this paper uses a set of partial correlators and a zero-padded FFT to reduce the search region for code acquisition whilst maintaining good frequency resolution for Doppler offset. This approach will prove most pertinent in future re-configurable terminals.


IEEE Transactions on Signal Processing | 1997

Nonlinear system identification and prediction using orthogonal functions

Iain Scott; Bernard Mulgrew

We describe a systematic scheme for the nonlinear adaptive filtering of signals that are generated by nonlinear dynamical systems. The complete filter consists of three sections: a signal-independent standard orthonormal expansion, a scaling derived from an estimate of the vector probability density function (PDF), and an adaptive linear combiner. The orthonormal property of the expansions has two significant implications for adaptive filtering: first, model order reduction is trivial since the contribution of each term to the mean squared error is directly related to the coefficient in the final linear combiner; and second, consistent and rapid convergence of stochastic gradient algorithms is assured. A technique based on the inverse Fourier transform for obtaining a PDF estimate from the characteristic function is also presented. The prediction and identification performance of this nonlinear structure is examined for a number of signals, and it is contrasted with common radial basis function and linear networks.


Building Research and Information | 2015

The home as enabler of more active lifestyles among older people

Katherine Brookfield; Claire Fitzsimons; Iain Scott; Gillian Mead; Neil Thin; Anthea Tinker; Catharine Ward Thompson

Inactive lifestyles have negative health consequences, while time spent sedentary (sitting and lying) is related to morbidity and premature mortality. Older adults often form the most sedentary segment of the population. Much of this behaviour may be practised at home where this group can spend extended periods. Physical activity rates among older adults are particularly low. Even household physical activities can be beneficial for this group, while they can constitute much of an older persons total activity. Despite this context, the homes role in the active and sedentary behaviours of the older population appears critically understudied. Using interview and focus group data collected from 22 older adults (healthy volunteers, stroke survivors and people with dementia), this paper begins to address this issue. Aspects of the home that aid or impede a more active, less sedentary lifestyle are identified with three presenting particular capacity in this respect discussed: steps, space within the home, and the location and form of facilities, fixtures and fittings. The crucial role health status plays in structuring this capacity is identified. Simple design recommendations, devised to support older people to lead more active lives at home, are presented.


International Journal of Environmental Research and Public Health | 2017

The Uncommon Impact of Common Environmental Details on Walking in Older Adults

Katherine Brookfield; Catharine Ward Thompson; Iain Scott

Walking is the most common form of physical activity amongst older adults. Older adults’ walking behaviors have been linked to objective and perceived neighborhood and street-level environmental attributes, such as pavement quality and mixed land uses. To help identify components of walkable environments, this paper examines some of these environmental attributes and explores their influence on this population’s walking behaviors. It draws on focus group and interview data collected from 22 purposively sampled older adults aged 60 years and over. These participants presented a range of functional and cognitive impairments including stroke and dementia. In line with past research, we detail how various everyday aspects of urban environments, such as steps, curbs and uneven pavements, can, in combination with person-related factors, complicate older adults’ outdoor mobility while others, such as handrails and benches, seem to support and even encourage movement. Importantly, we delineate the influence of perceptions on mobility choices. We found that, in some instances, it is the meanings and possibilities that older adults derive from aspects of the environment, such as street cameras and underpasses, rather than the aspects per se, which shape behavior. The implications for policy and practice are considered.


Archive | 2018

Outdoor Mobility and Promoting Physical Activity Among Older People

Neil Thin; Katherine Brookfield; Iain Scott

Outdoor physical activity (PA) is crucial for the health and wellbeing of older people. Evidence suggests that various environmental factors might be relevant to facilitating or hindering outdoor PA in this age group. To promote a better appreciation of these factors, we propose interactionist (or ‘ecological’) approaches to understanding the dynamic interactions between mind, body, prosthetics, society, and physical environments. We also review the global demographic and technological trends that are changing the nature and importance of those interactions, leading to new opportunities for indoor simulation of some of the beneficial features of outdoor environments.


Good Autism Practice (GAP) | 2009

Designing learning spaces for children on the autism spectrum

Iain Scott


international conference on acoustics, speech, and signal processing | 1994

A sparse approach in partially adaptive linearly constrained arrays

Iain Scott; Bernard Mulgrew


Buildings | 2012

Client Briefing: Eliciting Design Preferences from Building Users with Communication Impairments

Paul Jenkins; Iain Scott; Andrew Challen


The Artist and Journal of Home Culture | 2017

Mobility, Mood and Place—Co-Designing Age-Friendly Cities: A Report on Collaborations between Older People and Students of Architecture

Iain Scott

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Neil Thin

Center for Global Development

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Gillian Mead

University of Edinburgh

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G.J.R. Povey

University of Edinburgh

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Peter Grant

University of Edinburgh

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Ziwen Sun

University of Edinburgh

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