Patent ID: 9667463
Date: 2017-05-30
CPC Classifications: H04L

Claim:
1. A method for companding input signals wherein the method provides improved peak-to-average power ratio (PAPR) tolerance, reduced demodulation errors and improved out-of-band power rejection, the method comprising: defining a general family of functions Γ of the form: wherein η,α,β,γ denote respectively, amplitude scaling, argument scaling, argument translation, and ordinate translation parameters; wherein values of x correspond to horizontal axis positions of a signal amplitude probability density function; generating a compander function, C{x(n)}, based, at least in part, on g(x); companding the input signals using the compander function, C{x(n)} to produce companded signals that are scaled versions of the input signals and of input amplitude values of the input signals; wherein the compander function compands the input signals based, at least in part, on an inverse square root (ISQR) function over at least a portion of a probability density function, and wherein the companding of the input signals is based, at least in part, on the ISQR function defined by: where α,β,γ denote respectively, argument scaling, argument translation, and ordinate translation parameters; and where values of “x” correspond to horizontal axis positions of the signal amplitude probability density function; and transmitting the companded signals for orthogonal frequency division multiplexed (OFDM) wireless communications.