Multi-carrier underwater acoustic frequency hopping communication system based on n-select-m combination selector modulation

Abstract

The invention discloses a multicarrier underwater sound frequency hopping communication system based on m-out-of-N combination selector modulation and relates to the underwater sound communication. The system comprises a transmitting end and a receiving end. The transmitting end comprises a coding unit, a multicarrier modulation unit based on a C <m > <N > combination selection modulator, a frequency hopping modulation unit and an underwater sound transducer transmitting unit. The receiving end comprises an underwater sound transducer receiving unit, a frequency hopping demodulation unit, a multicarrier demodulation unit based on the C <m > <N > combination selection modulator and a decoding unit. The input end of the coding unit is connected with an information source. The output end of the coding unit is connected with the input end of the multicarrier modulation unit. The output end of the multicarrier modulation unit is connected with the input end of the frequency hopping modulation unit. The output end of the frequency hopping modulation unit is connected with the underwater sound transducer transmitting unit. The output end of the underwater sound transducer transmitting unit is connected with the input end of the frequency hopping demodulation unit. The output end of the frequency hopping demodulation unit is connected with the input end of the multicarrier demodulation unit. The output end of the multicarrier demodulation unit is connected with the input end of the decoding unit. The decoding unit outputs information sink.

Description

technical field [0001] The invention relates to underwater acoustic communication, in particular to a multi-carrier underwater acoustic frequency hopping communication system based on N-select-m combination selector modulation. Background technique [0002] Frequency Hopping (FH: Frequency Hopping) communication technology is widely used in various underwater acoustic communication systems due to its robust performance, strong anti-interference ability, good confidentiality, and easy realization of multi-access networking. However, it is difficult to maintain phase consistency due to the need to continuously switch frequencies in the implementation, so non-coherent multi-frequency frequency shift keying (MFSK: M-ary Frequency Shift Keying) technology is widely used for implementation. figure 1 Shown is the block diagram of the FH-MFSK underwater acoustic frequency hopping communication system. The biggest disadvantage of MFSK modulation technology is the low utilization rat...

AI Technical Summary

Problems solved by technology

The multi-carrier modulation currently reported includes a frequency hopping communication system based on binary on-off keying (OOK: On-Off Keying) modulation and a frequency hopping communication system based on OFDM modulation technology. These two multi-carrier modulation methods can greatly improve hopping The data transmission rate of the frequency underwater acoustic communication system, but there is the problem that the number of modulated carriers is uncertain

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