Abstract
A constant-amplitude modulation scheme for orthogonal frequency-division multiplexing (OFDM) over wireless channels is proposed in this paper. To alleviate the high peak-to-average power ratio (PAPR) of OFDM signals, the proposed scheme decomposes an OFDM signal into two constant-amplitude signals, which are transmitted at different timing. On the receiver side, the original OFDM signal is regenerated by combining two received signals that originate from these two constant-amplitude signals, which are propagated through the wireless channels. As a conventional constant-amplitude OFDM scheme, the constant envelope OFDM (CE-OFDM) scheme transforms the OFDM signal into a phase modulated signal. Computer simulations make a comparison between the proposed and conventional schemes, and demonstrate that the proposed scheme is much superior to CE-OFDM in bit error rate (BER) performance while both the schemes have almost the same out-of-band spectral characteristics.
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