Abstract
This paper proposes a new physical layer architecture for uplink multiple access based on orthogonal frequency division multiplexing (OFDM). It achieves low peak-to-average power ratio (PAPR) and high reliability with low computational complexity at both the transmitter and receiver, targeting low-latency communications such as transmission of control information in machine-to-machine (M2M) and device-to-device (D2D) communications. Our approach is based on the judicious combination of subcarrier hopping and super-orthogonal convolutional codes (SOCC) for achieving high coding gain and frequency diversity, together with Golay complementary sequences for low PAPR signaling. By introducing non-orthogonal multiple access where the subcarriers of different users are partially overlapped, the overall bandwidth efficiency can be improved. Furthermore, the low PAPR nature improves the power efficiency and thus enhances the transmission range. Employing the successive interference cancellation at the receiver further mitigates the resulting multiple access interference.
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