Performance_Evaluation_of_Hybrid_-_Multicarrier_Access_Schemes_for_Broadband_Wireless_Communication

May 5th, 2015
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Performance Evaluation of Hybrid Multicarrier Access Schemes for Broadband Wireless Communication Abstract: The realization of wireless communication providing high speed, high capacity and high quality information exchange between two portable terminals that might be located anywhere in the world is still the communication challenge.

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Performance Evaluation of Hybrid - Multicarrier Access Schemes for Broadband Wireless CommunicatioPerformance Evaluation of Hybrid Multicarrier Access Schemes for Broadband Wireless Communication Abstract: The realization of wireless communication providing high speed, high capacity and high quality information exchange between two portable terminals that might be located anywhere in the world is still the communication challenge. For the development of future wireless communication systems, an extremely spectrum-efficient transmission technology is required. In this study authors propose a novel signal scheme called Hybrid CDMA-SFH which combines OFDM with CDMA and SFH to generate a system functionally superior to MC-CDMA systems. This study explores various merits and demerits of the proposed system and compares it to the other multicarrier access schemes. The CDMA component provides the inherent advantage of DS-CDMA systems incorporating a spreading signal based on PN code sequence, by providing user discrimination based on coding at the same carrier frequency and simultaneously. The OFDM component provides resistance to multipath effects making it unnecessary to use RAKE receivers for CDMA and thus avoid hardware complexity. The SFH component provides resistance to the "near-far" problem inherent in CDMA. Therefore, this system retains the greatest advantage of CDMA viz., multiple accesses without the disadvantages of "near-far" problems and complexity of RAKE receivers.

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