## 1 Introduction  
The electric vehicles become more and more important in the future [1; 2; 3; 4; 5], with the increasing of the environmental awareness in the energy consumption area [6]. With the promotion of electric vehicles, the time-sharing rental business model with the electric vehicles as its carrier is developing rapidly. Vehicle terminal, as an intermediary of management platform and electric vehicle, is the only way to achieve remote monitoring, which is the main execution of the whole time-sharing business process for electric vehicles. The remote control is the main function of the vehicle terminal, supporting the time-sharing rental business process of electric vehicles. The responding speed affects the sense of user experience directly [7]. At present, in order to reduce the cost of communication, GPRS wireless communication is still mainly used on electric vehicle terminal to exchange data with management platform in real time. However, in the weak signal area, the response time of the electric vehicle terminal will become much longer, which has a great influence on the controlling of the management platform and the experience of users. In order to solve this problem, the main approach is to apply near-field communication [8; 9] such as Bluetooth [10; 11; 12], radio frequency identification/near-field communication (NFC/RFID) [13; 14] in vehicle terminal, leading to a balance and control between Bluetooth, NFC/RFID GPS, and global system for mobile communications (GSM), which may help to achieve goals of automatic identification, data acquisition and transmission, and remote real-time monitoring [15; 16; 17; 18]. However, Bluetooth communication has the compatibility problem of APP development. The credit card payment method as NFC, RFID needs to increase the cost and management of card and other issues. It is urgent to develop a near field communication mode with stronger compatibility, lower cost and more convenient management to realize the fast response of vehicle terminal. Acoustic wave communication is a kind of near field communication mode, which transmits information by acoustic wave [19]. However, the study of acoustic communication started late, the related technology rarely reported, mainly concentrated on the field of underwater acoustic communications [20; 21; 22; 23]. In 1945, the first underwater acoustic communication system was developed by the US Navy's underwater acoustic laboratory, which was mainly used for communication between submarines. Since the 70s of last century, with the development of electronic technology and information science, underwater acoustic communication technology has been switched from analog modulation technology [24] to digital modulation technology [25]. The acoustic field of the Chinese Academy of Sciences has studied the propagation of acoustic signals in the shallow sea, the adaptive matching experiment of marine acoustic channel, and the underwater communication experiment is carried out by using channel estimation and error correction code [26]. Harbin Engineering University has designed methods like frequency hopping, multi frequency, multi frequency and phase modulation mixing, adaptive discrete cosine transform (DCT) compression, vector quantization, and artificial neural network compression. Xiamen University uses multi-frequency shift keying (MFSK) to modulate the transmitted signal and detects the signal with the fast fourier transform (FFT) method [27]. Currently, the Institute of Acoustics of the Chinese Academy of Sciences, Northwestern Polytechnic University, Harbin Institute of Technology, Xiamen University, and other research institutions carried out research on underwater acoustic communication [28; 29], which promoted the acoustic communication to be an effective near field communication technology. At present, acoustic communication has become a popular way to realize near-field payment and control by virtue of good development compatibility, low cost, high degree of integration with mobile phone, and fast response.