Performance analysis for PAPR reduction using SLM technique in 2 × 1 and 2 × 2 differential STBC MIMO RS OFDM systems in rayleigh fading channel

Abstract

Orthogonal frequency division multiplexing (OFDM) has become a prevalent and widespread technique for the broadcast and transmission of signals over wireless channels and has been adopted in many wireless standards. OFDM may be united with antenna arrays at the transmitter and receiver side to improve the diversity gain and to improve the system competence on time-variant along with the frequency-selective channels, resulting in a multiple-input multiple-output (MIMO) composition. The space-time block coding (STBC) incorporated for OFDM systems with multiple transmit antennas is actually a type where coding is implemented in the time domain, that is, OFDM symbols. To be more particular and specific, Alamouti's code is taken into consideration, which is shown to be the most favourable block code for time domain coding and two transmit antennas. The Differential Space time block codes (DSTBC) are ways of transmitting data in wireless communications and they are forms of space time code that do not need to know the channel impairments at the receiver in order to be able to decode the signal. When Reed Solomon (RS) codes are used at the demodulator side the system becomes a DSTBC RS OFDM system and a performance analysis study is investigated based on Peak to Average Power Ratio (PAPR) using Partial Transmit Sequence (PTS) for different DSTBC RS OFDM Systems under Quadrature Phase Shift Keying (QPSK) modulation scheme and its performance is evaluated in terms of Bit Error Rate (BER) under Rayleigh Multipath channel.