Subcarrier-wise Backscatter Communications over Ambient OFDM for Low Power IoT

摘要: Ambient backscatter communication (AmBC) over orthogonal-frequency-division-multiplexing (OFDM) signals has recently been proposed as an appealing technique for low power Internet-of-Things (IoT) applications. The special spectrum structure of OFDM provides a range flexibility in terms bit-error-rate (BER) performance, data rate, and consumption. In this paper, we study subcarrier-wise ambient signals. This new AmBC is to exploit the transmit its squeezed orthogonal subcarriers. We propose basis transmission scheme two modifications support higher rate with superior BER performance compared existing methods. can one bit per subcarrier using on-off keying (OOK) modulation frequency domain. first modification, interleaved block model employed improve system frequency-selective channels. It results trade-off between size blocks rate. Thus, second index (IM) mitigate decrementation former modification. also stabilizes controls signal result interference reduction legacy receiver. Analytical numerical evaluations provide proof see method BER, interference.