Performance Analysis of Selective Mapping Scenario

Abstract

Orthogonal Frequency-division multiplexing (OFDM) of the most important techniques used in wireless communication systems since 1970 but not used widely because of the technology that they need to possibilities expensive as there was a difficulty then in use on a large scale., its idea was caused by problems that corresponded to the reference to previous techniques and also the result of increasing the number of users, Data transfer speed reached 54Mbps. The signals used are digital signals like QAM, BPSK, and QPSK so use the digital embedding techniques and in this paper, QPSK was used, it is noticeable in this technique that users are distributed by frequency. One of the major drawbacks of OFDM is the high Peak-to- average-power ratio (PAPR) of the Transmitter’s output signal. There are many different algorithms that have been proposed to solve the high PAPR problem of OFDM system like selective mapping (SLM), partial transmit sequence (PTS), Clipping method is the easiest way to reduce the PAPR of the OFDM   system but it has some limitations.  In this paper, we are using Selective Mapping (SLM) method which provides better and excellent performance for reduction of PAPR.  Selective Mapping is one way of probabilistic techniques where the actual transmit signal is selected from a set of signals to construct the transmitted signal.