Peak-to-average power reduction method

摘要

A method of reducing peak-to-average power in a hybrid signal is provided. The method determines peaks in power by defining a sample point by way of a digital vector and an analog vector. The digital and analog vectors are added together to generate a hybrid vector which is used to compare the sample point to the maximum desired peak threshold. An error vector is used to correct the sample point to a desired power level. Once the sample point has been corrected it can be added back to the analog signal and transmitted.

主权项

1. A method for peak-to-average power reduction in a hybrid signal comprising first and second separately modulated signals, the method comprising the steps of:
obtaining a sample point of the hybrid signal; defining the sample point by way of a first vector corresponding to the first separately modulated signal and a second vector corresponding to the second separately modulated signal; adding the first vector to the second vector to obtain a hybrid vector; comparing the hybrid vector against a maximum desired peak threshold to identify peaks in power; determining an error vector that reduces the identified peaks in power of the hybrid vector to within the maximum desired peak threshold; adding the error vector to a combination of the first and the second vector to reduce at least one peak in power of the identified peaks in power, and correcting a constellation and a spectrum of the combination of the first and the second vector after peak reduction to yield a corrected second modulated signal, wherein said correcting of the constellation and the spectrum comprises the steps of:
demodulating the second separately modulated signal;correcting all carriers in the demodulated signal;clipping non-carriers to a mask; andmodulating the corrected second separately modulated signal.