Browsing by Author "Sisay Bogale"

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    Competence and Legitimacy of Ethiopian Courts in the Adjudication of Socio-Economic Rights: An Appraisal of the Challenges and Prospects
    (Addis Ababa University, 2010-12) Sisay Bogale; Mizanie Abate
    Socio-economic rights are those human rights that aim at securing basic quality of life in terms of food, water, shelter, education, health care and housing for all members of a particular society. For proper enforcement of these rights, two things shall go hand in hand: legal recognition and judicial scrutiny in case of violations. To this end, the existence of courts capable of providing remedies is essential. Accordingly, this dissertation tries to assess the recognition of the rights in the Ethiopian legal system and the competence and legitimacy of Ethiopian Courts in the adjudication of these rights through a qualitative research method (interview of 13 judges along with the assessment of other international and domestic laws and literatures). Thus, the existing theoretical and practical challenges related to competence and legitimacy and other major impediments are identified. The major setback emanates from the FDRE Constitution itself which grants apparent power of interpretation of socio-economic rights to HOF. Other problems include: ouster clauses against powers of courts, poor perception of the people towards the judiciary, ambiguity on status of international instruments in the FDRE Constitution, non-publication of international instruments, absence of domestic legislation on the contents of socio-economic rights and absence of public interest litigation. The author of this dissertation argues that these challenges cannot absolutely hinder courts from judicial scrutiny of socio-economic rights in Ethiopia and can be overcome by the joint action of courts and the government. Accordingly, the dissertation concludes that Ethiopian courts are competent and legitimate to adjudicate socio-economic rights.
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    Performance Comparison of Multi-Mode Modulation Techniques for SDR Using FPGA
    (Addis Ababa University, 2023-11) Sisay Bogale; Yihenew Wondie (PhD)
    Radio devices that were previously built in hardware have been replaced in recent years by reconfigurable software defined radio (SDR) systems. Conventional hardware-based radios have restricted multi-functionality and are physically changeable only. This leads to an increase in production expenses and a reduction in the number of waveform standards that can be supported. A rapid and affordable answer to this issue is provided by software-defined radio technology, which enables software upgrades for multi-mode, multi-band, and multi-functional wireless devices. In SDR, different modulation techniques are used to achieve efficient communication over a radio channel. Multi-mode modulation is an approach that allows the use of multiple modulation schemes in a single system, which can enhance the flexibility and resilience of communication systems. This paper presented a design and implementation of multi-mode modulation techniques for SDR using FPGA and analyze the performance based on the FPGA resource utilization. It combines six modulation schemes: QASK, QPSK, QAM, AM, PM and FM to create multi-mode modulation system. The performance of this multi-mode modulation system is evaluated in terms of FPGA resource utilization such as total computational power, total number of Look Table (LUT) or memory used, Flip Flops (FF) and Input/Output (IO) port usage. Xilinx Vivado system generator for DSP with MATLAB/Simulink is used to design, simulate and verify the multi-mode modulator, which would then be implemented on a Xilinx Zedboard FPGA hardware. A total of 0.225W power, 844 number of LUT and 1 IO port is utilized by the implemented design. The biggest thing we achieved in this research is that we saved computational power. 1.572W and 1.134W amount of power is saved by our design as compared to previous two studies.