  An OFDM system is combined with multiple-input multiple-output (MIMO) in
order to increase the diversity gain and system capacity over the time variant
frequency-selective channels. However, a major drawback of MIMO-OFDM system is
that the transmitted signals on different antennas might exhibit high
peak-to-average power ratio (PAPR).In this paper, we present a PAPR analysis
reduction of space-timeblock-coded (STBC) MIMO-OFDM system for 4G
wirelessnetworks. Several techniques have been used to reduce the PAPR of the
(STBC) MIMOOFDM system: clipping and filtering, partial transmit sequence (PTS)
and selected mapping (SLM). Simulation results show that clipping and filtering
provides a better PAPR reduction than the others methods and only SLM technique
conserve the PAPR reduction in reception part of signal.
