Achieving high speed UWA (underwater acoustic) communication with adaptive MOMC (multimode orthogonal multicarrier) technology

Aim. It is well known that there are many obstacles that make high speed UWA communication among UUVs (underwater unmanned vehicles) and between UUVs and commanding ship very difficult to implement. We now propose achieving it with our adaptive MOMC technology. In the full paper, we explain in detail how to achieve such UWA communication; in this abstract, we just add some pertinent remarks to listing the three topics of explanation; (1) channel model of UWA communication, (2) adaptive MOMC technology, and (3) adaptive algorithm based on SNR (signal to noise ratio) threshold; under topic 2, we give Fig.1 in the full paper as the schematic of the flow chart of adaptive MOMC 'communication; topic 3 explains how to take into consideration the communication range that exists for a short time interval in the acoustic channel and then explains how the adaptive MOMC system can adaptively select the suitable mode for this short time interval; the subtopics of topic 3 are the selection of adaptive modulation (subtopic 3.1), the selection of adaptive bandwith (subtopic 3.2) and the allocation of bit size and power to each subcarrier (subtopic 3.3). The results of experiments conducted in a lake, summarized in Table 2 in the full paper, show preliminarily the correctness and efficiency of our adaptive MOMC system as the transmission data rates reach 9090bps and 2000 bps in the range of 5 km and 25 km respectively with the bit error rate < 10^-4.