Journals of Universiti Kuala Lumpur
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Intensity Adjustment Analysis of Underwater Images
Full text linkThis paper focuses on the subjective area of image enhancement techniques by modifying the colours and intensities. Image enhancement makes image more visually appealing. The underwater imaging tends to become bluish as the photographing activities go down deeper and deeper into the ocean. It is due to light absorption and diffusion effects of light. The images mentioned is taken from digital camera which has low resolution. The images undergo intensity adjustment methods as well as the colour map to seek for the correct colour of the images. It is found that both intensity adjustment whether adjusting the intensity values to a specific range or by histogram equalization illustrates better histogram as compared to the original images. The colour adjustment also demonstrates a good result by adjusting iteratively the red, green and blue panels. It is hoped that the study will benefit users with low resolution digital cameras to have better viewing as well as enjoying better quality of the images
System and Link Level Performance of Pico and Macro-cells in 3D Extended Channel Models LTE-Advanced Networks
Full text linkThis paper evaluates the user performance analysis at system level of pico-cells and macro-cells in 3D Extended Channel Models LTE-Advanced Networks. The analysis makes use of state-of-the-art 3D raytracing for a large number of macro and pico-cell base stations and user equipment locations. A baseband LTE-A link level simulator for 2x2 MIMO was designed and implemented in MATLAB to determine the user performance in pico-cells and macro-cells for line-of-sight and non-line-of-sight link. A pico-cell and macro-cell UE analysis at the system level and a comparison of external wall and lamp-post mounted picocell are also presented. User performance is analysed in terms of mean power, link budget and path loss coefficient. The empirical path loss equation for pico-cells and macro-cells in a HetNet urban environment are analyzed using 3D ray tracing data. The analysis shows that the user gains in terms of received power when the Pico base station is mounted on an external wall of a building rather than a lamp post. It can be determined that the deployment of pico-cells can be used to improve existing macro network coverage and performance in an LTE-Advanced network mostly near the cell edge