Fast Implementation of Transmit Beamforming for Colocated MIMO Radar

Multiple-input Multiple-output (MIMO) radars benefit from spatial and waveform diversities to improve the performance potential. Phased array radars transmit scaled versions of a single waveform thereby limiting the transmit degrees of freedom to one. However MIMO radars transmit diverse waveforms from different transmit array elements thereby increasing the degrees of freedom to form flexible transmit beampatterns. The transmit beampattern of a colocated MIMO radar depends on the zero-lag correlation matrix of different transmit waveforms. Many solutions have been developed for designing the signal correlation matrix to achieve a desired transmit beampattern based on optimization algorithms in the literature. In this paper, a fast algorithm for designing the correlation matrix of the transmit waveforms is developed that allows the next generation radars to form flexible beampatterns in real-time. An efficient method for sidelobe control with negligible increase in mainlobe width is also presented

Energy Monitoring and Analysis for 3 phase systems

Nearly 26% of energy consumption in India is from commercial buildings. Also, as per US energy information agency, commercial building energy consumption is growing at 2.7% rate every year in India. Because of not having proper energy monitoring systems, most of the energy consumption in buildings is going into waste. In this regards this thesis presents a solution for building energy monitoring and analysis on the data obtained from the 3 phase energy monitoring. The data for energy monitoring is obtained using Multi Functional Meter, which measures electrical qualities like voltage,current,powers etc. The meter supports RS 485 communication, which is used to collected the data from the meter. First, by monitoring the collected data, sending an alert mail to the respective employee to avoid the overloading of power cables is presented. Secondly, data analysis on the obtained data are presented. In the analysis of the data some factors like load factor, Unbalance factor, rise time, high load duration period are calculated from the obtained load curve. These parameters will help the building operator or manager in proper utilization of the energy consumption of a commercial building. Thirdly, interfacing multi functional meter with arduino is proposed in order to get full control over the meter. For validation the proposed solution is applied to a commercial IITH building and the results are presented

Early diagnosis of Carpal Tunnel Syndrome (CTS) in Indian patients by nerve conduction studies

The present study was carried out for early confirmation of clinicallydiagnosed patients of Carpal Tunnel Syndrome (CTS) by electro-diagnostic tests which included motor conduction, sensory conduction studies and F-wave studies. The aim of the study was early confirmation of clinically suspected patients of CTS by motor and sensory conduction studies of median and ulnar nerves. Eighty subjects of age group 30-50 years (40 clinically suspected patients of CTS, 40 as control group) were studied. Motor and Sensory conduction velocities, distal motor and sensory latencies and F wave latencies of median and ulnar nerves were performed using RMS EMG EP Mark –II. Statistically significant (P < 0.001) slowing of motor conduction velocities for both nerves was seen in the CTS group as compared to control group. Decrease in sensory conduction velocity wasmore pronounced in CTS group as compared to Control group. Statistically significant (P < 0.001) increase in distal motor and sensory latencies was also observed for both median and ulnar nerves in the CTS group as compared to Control group, with more increase in distal motor latency than sensory latency. Increase in F wave latencies of both nerves was seen in the CTS group. Electrophysiological studies confirmed the early diagnosis of CTS with a high degree of sensitivity. Present results confirm selective slowing of sensory & motor conduction within wrist to palm segment in patients of CTS which is attributable to compression by the transverse carpal ligament or to a disease process of the terminal segment.KEY WORDS: Nerve entrapments; Median neuropathy; Electro-physiological diagnosis; Distal and motor sensory latencies; Palm wrist conductio

Power Allocation for Uniform Illumination with Stochastic LED Arrays

Light has traditionally been used for making objects visibl e to the naked eye. Lately, there has been tremendous interest in using it for free space communication [1]. This has simultaneously been accompanied by significant interest in light emitting diodes (LEDs) that have been replacing conventional light sources in almo st all applications [2–4]. Fair amount of existing literature has focused on achieving unif orm irradiance over a planar surface [5–8], beginning with the problem of finding the opti mal LED geometry at the light source to achieve uniform irradiance [9]. This was don e by using the irradiance distributions at the closest points on the incident surface . The case of LEDs using a freeform lens with a large view angle has been considered in [ 10]. More literature on similar themes is available in [11,12]

Maximum likelihood detection for decode and forward cooperation with interference

In this paper, we obtain the maximum likelihood (ML) decision for a decode and forward (DF) cooperative system in Nakagami-m fading in the presence of co-channel interference at the relay as well as the destination. Through simulation results, we first show that conventional ML designed for interference free systems fails to combat the deleterious effect of interference. An optimum ML decision for combating interference is then derived for integer m. This receiver is shown to be superior to conventional ML through bit error rate (BER) performance simulations. Further, our results also indicate that optimum ML preserves relay diversity in the presence of interference