Patent ID: 8848813
Filing Date: 2014-09-30
Classification: H04L

Abstract:
1. A method comprising: Orthogonal frequency division multiplexed (OFDM) modulating a first signal having a first peak-to-average ratio (PAR) to provide a first central band of subcarriers, a first band of unused subcarriers, and a second band of unused subcarriers, the first and second bands of unused subcarriers being on either side of the first central band of subcarriers; clipping the first signal at a threshold level to generate a clipped signal; forming from the clipped signal a second central band of subcarriers, a third band of unused subcarriers, and a fourth band of unused subcarriers, the third and fourth bands of unused subcarriers being on either side of the second central band of subcarriers; and forming a second signal with a second PAR, which is less than the first PAR, from the third and fourth bands of unused subcarriers and substituting the first central band of subcarriers for the second central band of subcarriers.