Patent ID: 7986738

Claim:
A process for generating a reduced peak to average power ratio (PAPR) symbol for a communications system using a first plurality of subcarriers which are information subcarriers and a second plurality of subcarriers which are not information subcarriers, where said first plurality of subcarriers and said second plurality of subcarriers are subject to frequency domain magnitude limitations, the process comprising: a transmitter computing the peak to average power ratio (PAPR) for said first plurality of subcarriers, and when said PAPR is above a particular threshold, performing: a first step of forming a limited list of peak amplitudes and associated offset time for each said peak amplitude, said limited list containing the largest peak amplitudes; a second step of forming candidates, each said candidate generated by using a fixed set of kernels which use only said second plurality of subcarriers, expanding each one of the fixed set of kernels by multiplication with {1, j, −1, −j}, and time shifting each said expanded kernel by a time offset corresponding to one of said peak amplitude time offsets; a third step of computing the peak to average power ratio for a superposition of said symbol and one or more of said candidates and repeating said third step until said PAPR is below a threshold or until an iteration count is reached; a fourth step of selecting said third step superposition of said symbol and one or more of said candidates to form said reduced PAPR symbol.