OFDM (orthogonal frequency division multiplexing) is susceptible to high peak-to-average power due to an unstable envelope. Many solutions have been utilized in order to decrease the high peaks that are possible, but in these cases complexity is also added to the system architecture. In our earlier work, we introduced CI codes as a powerful tool to increase OFDM performance. This paper shows how carrier interferometry phase coding eliminates peaks in the signal envelope and in effect the problems associated with large PAPR.
['David A. Wiegandt', 'Carl R. Nassar', 'Zhiqiang Wu']
Overcoming peak-to-average power ratio issues in OFDM via carrier-interferometry codes