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Constant Modulus Orthogonal Frequency Division Multiplexing

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Executive Summary

Orthogonal Frequency Domain Multiplexing (OFDM) is the signal format of choice for spectrally efficient communications over time-invariant, frequency-selective channels. OFDM has a large peak-to-average power ratio, however, which makes it incompatible with transmitter non-linearities (e.g., saturated Power Amplifiers (PAs)). Conversely, single-carrier constant envelope modulations can be used with a saturated PA, but exhibit limited spectral efficiency and requiring more complex receiver processing (i.e., channel equalization). This paper presents a method of modulation coding that results in an OFDM signal with Constant Modulus (CMOFDM). A method of decoding this modulation code is developed and the resulting CM-OFDM system performance is compared to that of OFDM via simulation.

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