Application of SC-FDE in Ultrasonic Wireless Communication System

Single carrier frequency domain equalization (SC-FDE) technology is applied to ultrasonic wireless communication systems. The traditional cyclic prefix (CP) is replaced by the unique word (UW) sequence for channel estimation. The signal sequence is transmitted through an acoustic-electrical conversion channel composed of two piezoelectric transducers and a metal wall. And the received signal is decoded after least squares (LS) channel estimation and minimum mean square error (MMSE) channel equalization in the frequency domain. Finally the original signal is obtained. We use two 1MHz piezoelectric pieces and a 7mm copper plate as acoustic-electrical channel. The experimental results show that the scheme can achieve a communication rate of 80kbps, and the bit error rate is 1.56E-2, which lays a good foundation for the subsequent study.