Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) Based Image Transmission Using Hadamard Transform as PAPR Reduction Technique
Mehboob ul Amin1, Randhir Singh2, Javaid.A.Skeikh3
1Mehboob ul Amin, Sri Sai College of Engineering, Pathankot Punjab, India. 
Randhir Singh, Sri Sai College of Engineering, Pathankot Punjab, India.
3Javaid.A.Skeikh, Department of Electronics and Instrumentation Technology, University of Kashmir, Srinagar, India.
Manuscript received on March 22, 2013. | Revised Manuscript received on April 12, 2013. | Manuscript published on April 30, 2013. | PP: 550-553 | Volume-2, Issue-4, April 2013. | Retrieval Number: D1534042413/2013©BEIESP

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Abstract: High data rate wireless communications demands robustness, high spectral efficiency, frequency selective fading, and low computational complexity. Orthogonal Frequency Division Multiplexing (OFDM) is one of the most promising technologies to achieve these goals. OFDM can be used in conjunction with a Multiple-Input Multiple-Output (MIMO) transreceiver to increase the diversity gain and/or the system capacity by exploiting spatial domain. Because the OFDM system effectively provides numerous parallel narrowband channels, MIMO-OFDM is considered a key technology in emerging high-data rate systems such as 4G, IEEE 802.16, and IEEE 802.11n. However there is one main disadvantage of MIMO-OFDM that is the high peak-to-average power ratio (PAPR) of the transmitter’s output signal on different antennas. High Peak to Average Power Ratio (PAPR) for MIMO-OFDM system is still a demanding area and difficult issue. By now, for reducing PAPR, numerous techniques have been recommended. In this paper Hadamard Transform based Selective Level Mapping as method of PAPR reduction technique has been proposed and simulated. The whole simulation work has been tested on image signal and the results at both transmitter and receiver have been verified in terms of various graphs and plots.
Keywords: Multiple Input Multiple Out (MIMO), Peak to Average Power Ratio (PAPR), Orthogonal Space Time Block Code (OSTBC) Encoder, Hadamard Transform, Complementary Cumulative Distribution Function (CCDF).