البحث — المستودع الرقمي العراقي

المستخلص: Patient's health monitoring / diagnosing systems have become the focus of attention of researchers today. At the present time, the researchers are dealing with the E - health fields to develop and improve the healthcare systems and they work to combine the GSM and Internet technologies together.In the presented work, the researcher designed a portable real time wireless medical system for monitoring / diagnosing the patients' status based on E - health / GSM - health / I - health and wireless sensor network (WSN) under ZigBee protocol, and to support alarming and printing of medical reports subsystems.The presented system consists mainly of four subsystems, which are sensing & data transceiver, base station (BS), GSM and Internet. Where sensing & data transceiver subsystems be in the patients' lobbies and connected remotely with the base station (BS) subsystem in the wireless sensor network that collect and display the sensing data in it. Also in the designed system, the GSM and Internet technologies are inserted practically in the network.The implemented system measures the biomedical data utilizing a group of sensors that are not available in the country's hospitals in such integrated system, which are the patient position sensor (PPS), galvanic skin response sensor (GSR), blood glucose sensor (BGS), and electromyography sensor (EMG). Moreover, the system has the ability to add many other sensors.In the proposed system, three nodes (lobbies) are considered according to the facilities available, but it can monitor / diagnose unlimited patients' numbers.The system monitors the sleep position and skin conductance (indicator to patient's calm) of the patients in real time with alarm for each abnormal case in the base station (BS) and in lobbies, and it also follows up the glucose rate in patient's blood and diagnose the electromyography (muscle and nerve) status.The GSM subsystem (GSM - health) is used for remotely following - up the patients' status by sending SMS alarm in time for any abnormal case of the patient's sleep position and skin conductance, also it has ability to send the glucose data to doctor's phone. All these services are performed by using a personal phone device only without using any additional GSM modem or other apparatus, so this method reduces cost, complexity and delay time of the system that's done by interfacing the phone with the PC directly via USB port and the messages sending procedure executed using special SMSs AT commands, so the doctors become able to communicate with BS using SMS or voice calling to give the fast and direct necessary guidance.The Internet subsystem (I - health) is another excellent service for the presented system, by which remotely following - up the glucose levels by uploading the glucose data to a specific web site. It is performed by designing a web site that is programmed using VB.NET and ASP.NET languages. of course, user login feature is added to protect the privacy of patients and feedback comments feature between the doctors and patients to take the important guidance.The system has ability to introduce a printed hard copy report about the patient's electromyography status or result and blood glucose levels, by utilizing VISUAL BASIC program. Moreover, it performs searching process about the active nodes in network, this means that it detects any new node (new patient) and put it in service. In addition, the system records the patient's information and stores his health data for any archiving process or statistical study.The main hardware that is used in the implemented system includes MCUs, sensors and transceivers, and used the LABVIEW program to display the data in its GUI windows in the computer of BS.The system has been implemented practically at low cost and low power, gave expected and accurate results, and presented to the specialists doctors and they have expressed their conviction and effectiveness of the system in practice.

تقييم اداء نظام تحويل المويجات المنفصلة - مازج تقسيمات التردد المتعامد المشفر للتطبيقات ذات السرعة العالية == Performance Evaluation of DWT - COFDM System For High Speed Applications

اسم المؤلف: ضفاف طلال شاكر

اسم المشرف: سعد سفاح حسون

الموضوع العام: هندسة الكهرباء والالكترون والاتصالات

السنة: 2014

الموضوع الدقيق: هندسة الكهرباء

الدرجة: ماجستير

الجامعة: جامعة بابل - كلية الهندسة - قسم الهندسة الكهربائية

اللغة: الانكليزية

مكان الجامعة: بابل

الصفحات الاولى:

المستخلص: The internet revolution has created the need for wireless technologies that can deliver data at high speeds in a spectrally efficient manner. However, supporting such high data rates with sufficient robustness to radio channel impairments requires careful selection of modulation techniques. The demand for high - speed mobile wireless communications is rapidly growing. OFDM technology promises to be a key technique for achieving the high data capacity and spectral efficiency requirements for wireless communication systems. Abstract In this thesis, Inverse Discrete Wavelet Transform (IDWT) is used as a modulation technique instead of Inverse Fast Fourier Transform (IFFT) with coded OFDM due to its excellent orthogonality and superior spectral containment properties of wavelet filters. Coded Orthogonal Frequency Division Multiplexing (COFDM) is the same as OFDM except that forward error correction is applied to the signal before transmission. This is to minimize errors in the transmission due to lost carriers from frequency selective fading, channel noise and other propagation effects. Convolutional code is used in this thesis as a forward error correction code. The proposed (DWT - COFDM) system is simulated under the effect of additive white Gaussian noise channel, and multi - path fading channel at different values of Doppler frequencies (22.2Hz, 41.7Hz and 444.4Hz) which are the most significant impact channel parameters on the bit error rate performance. The proposed system is also compared with DWT - OFDM, FFTCOFDM and FFT - OFDM systems. It is found that the proposed system can significantly improve the BER performance and it performs better than the other three systems. On the other hand, convolutional code and DWT is used to reduce the peak to average power ratio (PAPR) which is considered the serious problem in any wireless communication system using multi carrier modulation techniques like OFDM systems by using two of the most important non distortion techniques which are selective level mapping (SLM) and partial transmit sequence (PTS) and the results show that the proposed systems for SLM and PTS techniques can perform better than the conventional SLM and PTS. The results also show that the proposed PTS technique performs better than the proposed SLM technique.