Ultra-wideband (UWB) in biomedical applications

The UWB spectrum, when fully utilized, offers potential application in the biomedical field. With the Ultra wide bandwidth, the UWB signal offers subcentimeters resolution which is suitable for biomedical applications, where the body is normally the channel, UWB signal is non-ionizing, and due to the restriction imposed by FCC, operates at a much lower power level compared to cell phones. These properties, coupled with the advance in UWB technology development in the communication industry, led to interesting research in the area.Master of Engineerin

Cooperative UWB body area networking: channel measurement and diversity analysis

We explore the application of cooperative communications in ultra-wideband (UWB) wireless body area networks (WBANs). Firstly, time-domain UWB channel measurements are presented for a sitting human subject. Important channel parameters such as the pathloss, power variation, power delay profile (PDP), and effective received power (ERP) cross-correlation are extracted and statistically analyzed. Armed with the model preliminaries, an intuitive measure is proposed to quantify the diversity gains in a single-relay, single-hop cooperative WBAN, which is defined as the number of independent paths that can be averaged over to detect symbols. Numerical results demonstrate the potential benefit of applying cooperative techniques in futuristic body-centric networks

Breast lesion classification using ultrawideband early time breast lesion response

Breast lesion characterization for discriminating between localized malignant and benign lesions is important as the current breast screening techniques do not have the required specificity to be clinically acceptable. A method using ultrawideband (UWB) microwave imaging system for such classification is proposed in this paper. The early time portion of the backscatter breast response is processed for lesion discrimination. This method provides a high resolution since the early time lesion response has the largest signal strength. A correlator is used at the receiver to extract the early response and to quantify the degree of ruggedness of a lesion through several key parameters associated with the correlation operation. Subsequently, a large scale simulation study using a two-dimensional (2D) numerical breast model with an antenna array is used for the development of a lesion classification technique. It is shown that the lesion classification method is capable of discriminating between lesions with different morphologies

An overview of radar based ultra wideband breast cancer detection algorithms

Breast cancer is the most common cancer in women in almost all countries around the world, and is one of the most common non-infective causes of death. Mammography, which uses ionising radiation, is the only early breast cancer screening technique proven to reduce breast cancer mortality in randomised controlled clinical trials. However, screening mammography is expensive, technically demanding and requires a high level of clinical expertise. It cannot be performed in general medical clinical settings readily. Ultra wideband (UWB) or microwave breast screening has the potential to be a safe, accurate and easy-to-use technique for breast disease detection that is more effective than routine clinical palpation or breast self-examination. Ultra wideband breast cancer detection algorithms have been researched by several groups for over a decade, with numerous algorithms reported. This paper serves to give an overview of existing algorithms for UWB breast cancer detection

Cooperative communications in ultra-wideband wireless body area networks: Channel modeling and system diversity analysis

In this paper, we explore the application of cooperative communications in ultra-wideband (UWB) wireless body area networks (BANs), where a group of on-body devices may collaborate together to communicate with other groups of on-body equipment. Firstly, time-domain UWB channel measurements are presented to characterize the body-centric multipath channel and to facilitate the diversity analysis in a cooperative BAN (CoBAN). We focus on the system deployment scenario when the human subject is in the sitting posture. Important channel parameters such as the pathloss, power variation, power delay profile (PDP), and effective received power (ERP) crosscorrelation are investigated and statistically analyzed. Provided with the model preliminaries, a detailed analysis on the diversity level in a CoBAN is provided. Specifically, an intuitive measure is proposed to quantify the diversity gains in a single-hop cooperative network, which is defined as the number of independent multipaths that can be averaged over to detect symbols. As this measure provides the largest number of redundant copies of transmitted information through the body-centric channel, it can be used as a benchmark to access the performance bound of various diversity-based cooperative schemes in futuristic body sensor systems

Green processing mediated novel polyelectrolyte nanofibers and their antimicrobial evaluation

10.1002/mame.201300141Macromolecular Materials and Engineering2993283-289MMEN