High peak to average power ratio (PAPR) mitigation in high speed data networks using symbol mapping adjustment

摘要

Embodiments provide techniques for high peak to average power ratio (PAPR) event mitigation in high speed data networks, such as cable networks, for example. Embodiments are applicable to multi-carrier and single-carrier modulation systems. Embodiments operate by predicting or detecting the occurrence of a peaking event at the transmitter, and then mitigating potential effects of the peaking event at the transmitter, including application of alternative constellation symbol mappings.

主权项

1. A method of mitigating a peaking event, comprising:
detecting or predicting, at a transmitter, a peaking event in a signal to be transmitted by the transmitter, wherein the signal is a multi-carrier modulated signal, generated by modulating a plurality of symbols with a respective plurality of sub-carriers; enumerating the plurality of sub-carriers to assign a respective number to each of the plurality of sub-carriers; determining an amplitude of the peaking event; processing the signal, after said detecting or predicting, to reduce the peaking event in the signal to generate a peak mitigated signal, wherein said processing comprises modifying in the frequency domain one or more symbols of a plurality of symbols associated with the signal; adjusting phases of one or more of the plurality of sub-carriers having respective numbers above a predetermined number, wherein the predetermined number is selected based on the amplitude of the peaking event; and transmitting the peak mitigated signal by the transmitter.