M. A. Ullah

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Vessel, fovea and optic disk are the three most important features of human retina that are frequently used for retinal image registration, illumination correction as well as for pathology detection inside retina. In this paper, we present a fully automated approach that can detect and localize these organs from retinal fundus image effectively. For vessel(More)
Frequency hopping partially blocked multicarrier code division multiple accesses (FHPB/MC-CDMA) system is proposed in this paper and the system compares BER performance of MC-CDMA system under multi-path Rayleigh fading channels. FHPB/MC-CDMA may be considered as a novel modulation scheme and multiple access technique for next generation wireless(More)
The main thrust of fourth generation (4G) research worldwide is dedicated towards spectrally efficient systems. This paper addresses a novel modulation technique and multiple access schemes named dynamic band selection multi-carrier code division multiple accesses (DBS/MC-CDMA) and compared with BER performances with conventional multi-carrier code division(More)
The 1.55 mum semiconductor laser has recently been the subject of much research effort around the world. In this work a novel InN-based 1.55 mum quantum well laser has been proposed. In order to reach the threshold current a very small voltage of 1.10 V is required. A very small threshold current of 7.3 mA is required to emit the light. The calculated(More)
In the presence of frequency-selective multi path fading channels, Multi Carrier Code Division Multiple Access (MC-CDMA) suffers from multi-user interference (MUI) and inter-symbol interference (ISI). In this paper, the Partial Block MC-CDMA system was proposed and Performance of the system was analyzed. In the conventional MC-CDMA system, users are(More)
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