Abstract
Constant envelope orthogonal frequency-division multiplexing (OFDM) can achieve 0-dB peak-to-average power ratio (PAPR) by transforming the OFDM signal to a constant envelope signal. However, its spectral efficiency is less than half of the OFDM. In this letter, a dual-stream transceiver structure with single antenna is proposed to increase the spectral efficiency. At the transmitter, the structure based on phase shifting is proposed to transmit two data streams simultaneously. At the receiver, the joint demodulation structure based on Taylor series expansion is proposed to separate the data streams and eliminate the need for a phase demodulator. The mathematical analysis reveals that the statistical PAPR of the baseband signal is 3 dB. The bit error rate performance is evaluated with additive white Gaussian noise channel and multipath fading channel under the condition of ideal power amplifier and solid-state power amplifier. Simulation results show that the proposed structure can improve the spectral efficiency and is robust against multipath fading.
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