الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
High peak to Average Power Ratio PARP for MIMO-OFDM system is still a demanding area and difficult issue. The radio transmitter stations for covering and getting enough transmit power in their desired area have to use high power amplifier HPA. on the other hand, in order the HPA have the most output power efficiency must be designed to work close to the saturation region therefore due to the high PAPR of input signals a factor which is called memory-less nonlinear distortion will be come into the commuincation channels. We know the MIMO-OFDM receiver`s efficiency is sensitive to the HPA. iF the high power amplifier dosen`t work in linear region it can cause the out-of-band power to be kept under the specified limits. This condition can cause inefficient amplification and expensive transmitters,thus it is necessary to investigate PAPR reduction techniques for MIMO-OFDM system. For reducing PAPR in MIMO-OFDM systems, numerous techniques have been recommended. Coding, phase rotation and clipping are among PAPR reduction schemes that have been proposed to overcome this problem. In this thesis, we will mainly investigate the PAPR reduction performance with two different PAPR reduction mehtods: selective mapping SLM and partial transmit sequence PTS, these two methods are subentities of phase rotation scheme. we derive theroetical amplitude probability density function PDF of the selected OFDM symbol using order statistics. This amplitude PDF enables us to derive the signal-to-noise ratio SNR as a function of the number of candidates and error performance of MIMO-OFDM for PAPR in Wireless System. Simulation results show that these techniques reduce the PAPR of the transmitted signals considerably. In addition, there are studied with repect to balanced performance and applicability.