Parallel Resampling of OFDM Signals for Fluctuating Doppler Shifts in Underwater Acoustic Communication

Abstract

Reliable underwater acoustic communication is demanded for autonomous underwater vehicles (AUVs) and remotely operated underwater vehicles (ROVs). Orthogonal frequency-division multiplexing (OFDM) is robust with multipath interference; however, it is sensitive to Doppler. Doppler compensation is given by two-step processing of resampling and residual carrier frequency offset (CFO) compensation. This paper describes the improvement of a resampling technique. The conventional method assumes a constant Doppler shift during a communication frame. It cannot cope with Doppler fluctuation, where relative speeds between transmitter and receiver units are fluctuating. We propose a parallel resampling technique that a resampling range is extended by measured Doppler standard deviation. The effectiveness of parallel resampling has been confirmed in the communication experiment. The proposed method shows better performance in bit error rates (BERs) and frame error rates (FERs) compared with the conventional method.

Formation control of multiple autonomous underwater vehicles: a review

“…To reduce the Doppler effect, a Doppler effect compensation system is designed using an efficient multi-rate sampling technique [171] . Similarly, using diffident resampling strategies, reduction of the Doppler effect for the moving platform can be achieved [172,173] . Due to the unpredictable ambient disturbances and long communication distance, it is possible for the AUVs fleet to encounter a period of communication disconnection, in which case dynamic network topologies can be used to describe it.…”

Investigation on High Reliability Wireless Communication of Underwater Sensor Networks for Submerged Acoustic Correspondence

“…So as to additionally improve the endurance season of the submarine organization. An improved DBR-based vitality recuperation DBR convention (EH-DBR) [23] is proposed, which utilizes the accompanying information bundles to gather vitality in the acoustic correspondence recurrence band to stack hub information. In principle, the life expectancy of the submarine organization can be broadened inconclusively.…”

“…As innovation for advancing channel portion, CDMA convention actualizes various access by spreading code distribution, while TDMA convention executes different access by isolating time allotments, along these lines diminishing bundle dispute [23]. The focal thought of the asset serious Macintosh convention is to seriously acquire remote channels for hubs that need to communicate information.…”

“…For the force utilization brought about via transporter detecting, a few conventions no longer use transporter detecting innovation. Impact Evasion Different Access (MACA) [23] is the primary handshake convention that doesn't utilize the transporter course; channel arrangement is brought out straightforwardly through three-party exchange. In view of this, in the writing research [24], the steadiness methodology is utilized to additionally improve the convention execution.…”