Penetration-free ultrasonic data transmission using single-carrier frequency domain equalization

A penetration-free ultrasonic data transmission algorithm using Single-Carrier Frequency Domain Equalization (SC-FDE) is proposed. The main advantage of the algorithm is to concentrate most system complexity to one side of metal barrier. Characteristics of penetration-free ultrasonic data transmission channel are considered, the computational complexity can be reduced, while rate of convergence can be accelerated by a variable step-size adaptive algorithm. A correlation synchronization algorithm is presented, which can be treated as a generalization of several existing synchronization algorithms. Schemes of combining this revised correlation synchronization algorithm with energy detection and training sequence information are also analyzed. System performance degradation is caused by starting point bias as well as accumulated carrier frequency offset. Corresponding optimization strategy is presented. Monte Carlo results demonstrate the effectiveness of the proposed SC-FDE penetration-free ultrasonic data transmission algorithm. The full system is capable of transmitting data at 1.298 Mbps through a 4-cm thick steel wall using transducers resonance at 500 kHz. Both severe inter-symbol interferences as well as bit-error rate during high-speed data transmission can be reduced.