ABSTRACT
This chapter describes a method of reducing the peak-to-average power ratio (PAPR) and introduces PAPR-optimal phase shifters for multicarrier communication systems. One of the important problems inherent in multicarrier communication systems is a need to control and, ultimately, reduce the value of the PAPR. The chapter also describes PAPR-optimal phase shifters for multicarrier communications. A phase shifter comprises two complex, constant envelope sequences. The first is the worst-case sequence; the phases of the second are the differences between the phases of a principal shifter and those of the first sequence. The proposed flat spectrum chirp (FSC) are excellent phase shifters that yield a significant reduction in PAPR. There is additional benefit in using multiple FSC instead of just one. Another potential application of FSC is to protect privileged information PAPR-wise. Some information may be so valuable that the data rate is unimportant in comparison to the absence of transmission errors.
