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GA-PTS Using Novel Mapping Scheme for PAPR Reduction of OFDM Signals Without SI

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Abstract

In recent time orthogonal frequency division multiplexing (OFDM) has proved its mettle as a preferred choice for high speed transmission in wireless applications due its efficient mechanism to combat the inter symbol interference. However sudden high peaks in OFDM signal envelope lead to high peak to average power ratio (PAPR). Enhanced values of PAPR result into complex RF amplifier circuit with reduced efficiency. There are various methods available for PAPR reduction, out of them partial transmit sequence (PTS) is most effective proven choice for PAPR reduction. However PTS technique requires cumbersome searching of all possible phase factors to find optimal phase factor which produces lowest PAPR, the information regarding optimal phase set used at the transmitter need to be sent to the receiver as side information (SI) for decoding purpose, however transmitting SI requires additional transmission bandwidth thus reducing overall bandwidth efficiency. To reduce the exhaustive searching genetic algorithm (GA) could be used with PTS leading to GA-PTS system. In this paper a GA-PTS system is proposed which uses novel octagonal geometry for constellation extension purpose. This scheme does not require transmission of any side information for decoding purpose at receiver and at the same time GA-PTS system reduces the required number of searches. Simulations are presented to show that proposed scheme provides similar PAPR performance as conventional PTS but without need of SI transmission at reduced number of searches.

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Authors and Affiliations

  1. Department of ECE, Jaypee Institute of Information Technology, Noida, India

    Alok Joshi

  2. Department of ECE, Chandigarh College of Engineering and Technology, Chandigarh, India

    Davinder S. Saini

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  1. Alok Joshi
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  2. Davinder S. Saini
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Correspondence to Alok Joshi.

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Joshi, A., Saini, D.S. GA-PTS Using Novel Mapping Scheme for PAPR Reduction of OFDM Signals Without SI. Wireless Pers Commun 92, 639–651 (2017). https://doi.org/10.1007/s11277-016-3568-2

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  • DOI: https://doi.org/10.1007/s11277-016-3568-2

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