Browsing by Author "Ali, Md. Abbas"

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    Behavior and techniques for improving performance of OFDM systems for wireless communications
    (2015-01) Barakabitze, Alcardo Alex; Ali, Md. Abbas
    Orthogonal frequency division multiplexing (OFDM) is a special case of multicarrier transmission which transmits a stream of data over a number of lower data rate subcarriers. OFDM splits the total transmission bandwidth into a number of orthogonal and non-overlapping subcarriers and transmit the collection of bits called symbols in parallel using these subcarriers. This paper gives a total insight of various Peak -to Average Power Reduction (PAPR) techniques and principles of OFDM systems used in wireless communications. The research paper places a focus also on OFDM behaviors and techniques like Carrier Frequency Offset (CFO) estimation that improves performance of OFDM for wireless communications. Finally, the paper provides a number of wireless communication standards and many of the applications where OFDM systems are used.
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    Evolution of lte and related technologies towards IMT-advanced
    (International journal of advanced research in computer science and software engineering, 2015) Ali, Md. Abbas; Barakabitze, Alcardo Alex
    The Long Term Evolution (LTE) is an emerging technology, which is standardized by the Third Generation Partnership Project (3GPP) and evolving to meet the International Mobile Telecommunication Advanced (IMT-Advanced) requirements named as LTE-Advanced. The main goal of LTE is to provide a high data rate, low latency and packet optimized radio access technology supporting flexible bandwidth deployments. The network architecture of LTE has been designed with the goal to support packet-switched traffic with seamless mobility and great quality of service. In this paper, we provide in-depth, the evolution and the major basic features of LTE to LTE-Advanced. Finally, we summarize the LTE-Advanced features in tabular format and show how LTE can fulfil the IMT-Advanced requirements.