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2010 (Vol. 2, Issue: 3)
Article Information:

Investigating the Impact of Hybrid/SPREAD MIMO-OFDM System for Spectral-Efficient Wireless Networks

Nirmalendu Bikas Sinha and R. Bera
Corresponding Author:  Nirmalendu Bikas Sinha 

Key words:  AWG, CDMA, MIMO, OFDM, RAKE, VSA,
Vol. 2 , (3): Page No: 289-294
Submitted Accepted Published
2010 April, 02 2010 April, 14 2010 May, 10
Abstract:

This research proposes a novel signal scheme called Hybrid spread MIMO-OFDM system which interface OFDM with CDMA and integrate this CDMA-OFDM to MIMO to generate a system functionally superior to MIMO-OFDM systems are considered as candidates for future broadband wireless service. OFDM may be combined with antenna arrays at the transmitter and receiver to increase the diversity gain and/or to enhance the system capacity on time-variant and frequency-selective channels, resulting in a Multiple-Input Multiple-Output (MIMO) configuration. The multiplexing technique proposed here is the Code Division Multiple Accesses (CDMA) scheme which is considered the solution for eliminating the distortion caused by fast fading and 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. In order to compare their performances, the effects of multipath signal propagation on the capacity, under both single and multi user channel, are examined. The Inter Symbol Interference (ISI) is used as a suitable measure of multipath effect. The obtained results show that the multipath has more influence on the capacity of MIMO than MIMO-OFDM and spread MIMO-OFDM. In addition, spread MIMO-OFDM offers more average capacity than MIMO under both single and multi user channel. In comparison with MIMO-OFDM, the capacity of spread MIMO-OFDM is higher under the condition of the multi user channel scenario. MIMO-OFDM spread system is being implemented using AWG and VSA. Thus making it possible to implement 4G using hardware and MATLAB/SIMULINK.
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  Cite this Reference:
Nirmalendu Bikas Sinha and R. Bera, 2010. Investigating the Impact of Hybrid/SPREAD MIMO-OFDM System for Spectral-Efficient Wireless Networks.  Research Journal of Applied Sciences, Engineering and Technology, 2(3): Page No: 289-294.
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ISSN (Online):  2040-7467
ISSN (Print):   2040-7459
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