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Abstract
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Article Information:
Performance Evaluation of Hybrid - Multicarrier Access Schemes for Broadband Wireless Communication
Nirmalendu Bikas Sinha and Sourav Chakraborty
Corresponding Author: Nirmalendu Bikas Sinha
Submitted: 2010 May, 22
Accepted: 2010 July, 20
Published: 2010 September, 10 |
Abstract:
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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 paper 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 paper 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. Hence authors should look for
OFDM because of its robustness to multipath and sophistication of synchronisation and because of the
possibility of using coherent signal processing in spite of frequency hopping and at the same time the multiuser
capability of CDMA systems. This is the novelty of our proposal. The simulated results elucidate that a
significant amelioration in terms of utilities specifically spectral efficiency for all users can be achieved using
this approach. A lso the propounded scheme exhibits better performance in the H ybrid CDMA-SFH in terms
of spectral efficiency as compared to the traditional system.
Key words: CDMA, Hybrid CDMA-SFH, MIMO-CDMA, RAKE, , ,
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Cite this Reference:
Nirmalendu Bikas Sinha and Sourav Chakraborty, . Performance Evaluation of Hybrid - Multicarrier Access Schemes for Broadband Wireless Communication. Research Journal of Applied Sciences, Engineering and Technology, (6): Page No: 519-526.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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