A NEW HYBRID SUB-BLOCK PARTITION SCHEME OF PTS TECHNIQUE FOR REDUCTION PAPR PERFORMANCE IN OFDM SYSTEM

The orthogonal frequency division multiplexing (OFDM) technique is regarded as one of the transmission techniques cardio fate, which will depend on it for the next generation of mobile communications systems because the existing features in this system. On the other hand, the important obstacle faced by OFDM system in practical applications is Peak to Average Power Ratio (PAPR). PAPR is one of the major drawbacks of the OFDM system because it leads the system devices to run out of the scope of the linear region of these devices, thus gives an increase to the non-linear region distortion, which affects and changes the superposition of the signal spectrum resulting degeneration in performance. So that, it is an important to reduce the PAPR value to be more receptive in real applications. Partial transmits sequence (PTS) one of the better techniques, which is proposed to solve the higher PAPR problem. The PTS technique divides the input data into several sub-blocks to reduce the autocorrelation between the subcarriers, compute Inverse Fast Fourier transforms for each sub-block, rotates the sub-blocks with rotation factor and then combines the sub-block for transmitting. In this paper, the new sub-block partition method is proposed by combining two traditional sub-block partition method (adjacent and pseudo-random) to reduce the higher PAPR performance. The performance of the new method is investigated by using various sizes of the subcarrier. The new method achieved better performance to reduce the PAPR value than the conventional sub-block partition interleaving (IP-PTS), adjacent (AP-PTS) and pseudo-random (PR-PTS). MATLAB software is used for comparing the new sub-block partition scheme and the other three traditional sub-block partition schemes. The simulation result appears the superiority of the new method to reduce PAPR performance with each number of the subcarriers compared with ordinary methods.