Volume 34, Issue 2, October 2016

Reflectionless Filters with Arbitrary Transfer Functions [Full Text]

Mohammad Khalaj-Amirhosseini and Arefeh Khalaj-Amirhosseini

Abstract—In this paper, a configuration is introduced as a reflectionless filter, which can have an arbitrary transfer function. The proposed configuration consists of two suitable complementary circuits. A methodology and some formulas are obtained to design exactly the proposed configuration. Some examples are instanced to verify the efficiency of the introduced idea to make reflectionless filters.

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4G or 3G, Does It Signify an Improvement in Telecommunication Technology in Cameroon? [Full Text]

Maurice Ayuketang Nso

Abstract— The world of telecommunication technology has products that are yet to be discovered and the ones discovered are not being exploited to their full capacity with 3G and 4G products not exempted from the category. The main challenge is; what does 3G and 4G stand for? They represent third and four generation of mobile networks respectively. The question whether 3G or 4G signifies an improvement in telecom technology was examined using both primary data – collected through the whatsApp social media and secondary data from websites. The paper shows that challenges such as lack of sufficient product knowledge due to low marketing efforts by telecom operators, lack of required equipments, education, culture, time and money savings made it difficult to conclude whether 3G or 4G signifies an improvement in telecommunication technology, although the download and upload speed might have improved. The lack of marketing efforts was evident on the number of users currently using 4G network which are very few as shown in table 4 in the paper under data presentation, analysis and interpretation. 

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A Survey on 5G Multi-carrier waveforms- Evaluation and Comparison for Diversified Application Scenarios and Service Types [Full Text]

Anwar Mousa and Tara Javidi

Abstract—This survey evaluates and compares the challenging candidates of multi-carrier waveforms focusing on their performance in mixed service scenarios envisaged for 5G systems. As it is difficult for a specific waveform to fulfill all the requirements of different application scenarios and service types of 5G, multiple waveforms coexist in 5G systems, each for a specific scenario. However, the most suitable waveform and numerology are selected to enable the best performance for each service. For this purpose, a sophisticated switching mechanism between different waveforms to choose the most appropriate scheme according to the existing scenario is required. In this survey, a simplified switching process is presented and discussed, depending on two important factors: latency and moving speed.