Abstract
Today’s rapid growth of elderly populations and aging problems coupled with the prevalence of obstructive sleep apnea (OSA) and other health related issues have affected many aspects of society. This has led to high demands for a more robust healthcare monitoring, diagnosing and treatments facilities. In particular to Sleep Medicine, sleep has a key role to play in both physical and mental health. The quality and duration of sleep have a direct and significant impact on people’s learning, memory, metabolism, weight, safety, mood, cardio-vascular health, diseases, and immune system function. The gold-standard for OSA diagnosis is the overnight sleep monitoring system using polysomnography (PSG). However, despite the quality and reliability of the PSG system, it is not well suited for long-term continuous usage due to limited mobility as well as causing possible irritation, distress, and discomfort to patients during the monitoring process. These limitations have led to stronger demands for non-contact sleep monitoring systems. The aim of this paper is to provide a comprehensive review of the current state of non-contact Doppler radar sleep monitoring technology and provide an outline of current challenges and make recommendations on future research directions to practically realize and commercialize the technology for everyday usage.
Highlights
Obstructive sleep apnea (OSA) is a common and potentially lethal sleep disorder affecting at least 4% of adult males and 2% of adult females world-wide [1]
The aim of this paper is to provide a comprehensive review on the current state of non-contact Doppler radar for sleep monitoring technology
Analysis of the results have shown that approximately 1.5 dB improvement of signal to noise ratio (SNR) and signal to clutter and noise (SNCR) in comparison with the algorithm proposed by Xu et al [94]
Summary
Obstructive sleep apnea (OSA) is a common and potentially lethal sleep disorder affecting at least 4% of adult males and 2% of adult females world-wide [1]. A comprehensive review of the non-contact Doppler radar for health monitoring for OSA diagnosis has been limited This is the primary motivation of this review paper. The aim of this paper is to provide a comprehensive review on the current state of non-contact Doppler radar for sleep monitoring technology. This includes a review of the system theoretical fundamentals, signal processing methodologies, techniques, achievements and challenges. This paper is organized as follows: Section 2 describes the topologies and architectures of the non-contact Doppler radar systems. A major disadvantage of homodyne topology is the amount of DC offsets introduced by the system, which can cause saturation for digitizer process [13,18,24]
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