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PAPR Reduction using Selective Mapping Method for OFDM Communication Systems

Shatrughna Prasad Yadav, Subhash Chandra Bera



Selective mapping method (SLM) is one of the most important techniques used for peak-to-average power ratio (PAPR) reduction of orthogonal frequency division multiplexing (OFDM) communication system. It is simple in implementation, gives distortionless transmission and reduces PAPR significantly. Mathematical modelling and Matlab simulation have been carried out to analyse its performances. At  of CCDF, PAPR values for OFDM signal without applying any reduction technique is 11.5, 11.8, 12.1, 12.4 and 12.6 dB for 64, 128, 256, 512 and 1024 numbers of subcarriers respectively.  When compared with OFDM signal, the reduction in PAPR value with SLM technique are 5.4, 4.4, 4.3, 4.1 and 3.9 dB with 64, 128, 256, 512 and 1024 number of subcarriers respectively for number of phase vectors equal to 16. There is reduction in the value of PAPR with decrease in number of sub carriers and increase in value of phase vectors. But this reduction in PAPR has been obtained at the cost of slight reduction in transmission data rate as side information has to be transmitted to the receiver having information about the phase vector which produces minimum PAPR value.

Keywords: Selective mapping method, OFDM, high power amplifier, peak-to-average power ratio, multi carrier communication

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