Peak to Average Power Ratio Reduction of OFDM Signal using Companding Transforms
Jyoti Gurjar, Shivraj Singh, Rohit Bhayre
Complementary cumulative distribution function (CCDF), Nonlinear companding transform (NCT), Orthogonal frequency division multiplexing (OFDM), Peak-to-average power ratio (PAPR).
The major drawbacks which is yet to be solved in orthogonal frequency division multiplexing (OFDM) system is its high peak-to-average power ratio (PAPR). In this paper, a new companding transform has been proposed which is nonlinear in nature and which transforms the Gaussian-distributed OFDM signals into a desired piecewise function. variable slopes and inflexion points are introduced in the target probability density function, to impart more flexibility in the companding form and an effective trade-off between the PAPR and bit error rate performances can be achieved along with a relatively low complexity. The theoretical analyses of different techniques and trade-off between PAPR reduction and bit error ratio (BER) performance are presented well.