OFDM-based micro-signal communication method for the spherical amphibious underwater vehicle

The micro-signal communication technology for the underwater vehicle is one of the important components of robot. With the rapid development of spherical amphibious robot, many high-tech scientific research institutions and universities around the world are studying the development and application of underwater robot. Recently, RF (radio frequency) has been widely adopted in the field for distant wireless communication. The OFDM (Orthogonal Frequency Division Multiplexing) method is a better way in signal transmission. As a kind of multi-carrier OFDM modulation technology, this method contains high frequency utilization, suitable for high speed data transmission and narrowband interference, etc. This paper proposed the OFDM modulation mode in the process of controlling the spherical amphibious robot. OFDM technology is able to decrease signal fading, which is suitable for distance information transmission in underwater robot. We carried out simulation experiments, with LS channel estimation and without channel estimation algorithm. The simulation results indicated that when added LS channel estimation in simulation experiment, it can effectively reduce the bit error rate, on the other hand, the simulation without LS channel estimation, bit error rate decreases relatively slowly. OFDM modulation method is a kind of mode in radio frequency communication module, which greatly decreased the bit error rate and maintain the signal transmission.