PAPR Reduction in the OFDM signal Using Partial Transmit Sequence

Abstract

Orthogonal frequency division multiplexing is becoming more and more popular nowadays. OFDM is widely used in 4G technologies in recent time. Main advantage of OFDM is that it uses orthogonal signal so removes inter signal interference. PAPR ratio in OFDM is very high because it uses multicarrier modulation ,which is its main drawback .OFDM is consist of the large number of the independent subcarrier, as a result of which the amplitude of the such a signal can have high peak values as it uses multicarrier modulation. More PAPR ratio means that more power needs to be transmitted from transmitter side .In our work we will try to reduce the PAPR using PARTIAL TRANSMIT SEQUENCE TECHNIQUE. In this technique data blocks are divided into non overlapping sub-block with independent rotation factor. This rotation factor generates time domain data using which it select signal having lowest PAPR. Results will be compared on the basis of the CCDF (complementary cumulative distribution function).