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AN ADAPTIVE POWER ALLOCATION SCHEME FOR ROBUST TRANSMISSION OF JPEG COMPRESSED IMAGES OVER MIMO-OFDM SYSTEMS

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Author(s): R.Deepa, | Dr.K.Baskaran

Journal: International Journal of Engineering Science and Technology
ISSN 0975-5462

Volume: 2;
Issue: 7;
Start page: 3120;
Date: 2010;
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Keywords: MIMO | OFDM | WLAN | 802.11n | cyclic prefix | ISI | UPA | JPEG

ABSTRACT
Multiple-input multiple-output (MIMO) wireless technology in combination with Orthogonal Frequency Division Multiplexing (OFDM) is a promising solution for implementing efficient next-generation wireless local area networks (WLANs) and fourth-generation mobile cellular wireless systems. This paper explores the advantages of using the combined effects of MIMO and OFDM for the transmission of JPEG compressed images. The spatially correlated channel is estimated using a pilot tone transmission and a power allocation based on Lagrangian dual is utilized to improve the power efficiency system. It is assumed that the channel state information is fedback from the receiver through a low feedback path. With unequal power allocation it is possible to extent the application of MIMO-OFDM for WLANs to efficient image transmission over a spatially correlated channel. The proposed unequal power allocation gives less error compared to equalpower allocation.
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