UDIF cooperation strategy and a JMC-TED detector for underwater acoustic cooperative communication

Abstract

The invention relates to the technical field of underwater acoustic cooperative communication systems, in particular to a UDIF cooperative strategy and JMC-suitable for a multi-user system and capableof saving end-to-end delay and used for underwater acoustic cooperative communication. The TED detector can still extract signals of the source node and the relay node according to different interleaving sequences even if interference exists between data packets, and meanwhile, the scheme can also reduce the end-to-end delay time; JMC-disclosed by the invention The TED detector combines the multiple branches to realize multi-branch combination; Turbo equalization and multi-user detection are carried out; The source node and the relay node use different interleaving sequences; therefore, the received signals cannot be directly combined; the signals are combined after de-interleaving processing; The combination coefficient is obtained on the basis of an output steady-state mean square error(SMSE) of each branch detector and is updated during each time of Turbo iterative processing, the method and the device can adaptively combine a plurality of received signals passing through different paths without knowing the CSI between the nodes, and are more suitable for an actual underwater acoustic cooperative communication system.

Description

Technical field: [0001] The invention relates to the technical field of underwater acoustic cooperative communication systems, in particular to a UDIF cooperative strategy for underwater acoustic cooperative communication and a JMC-TED detector suitable for multi-user systems and capable of saving end-to-end delay. Background technique: [0002] Underwater acoustic cooperative communication (UACC, Underwater acoustic cooperative communication) is a promising physical layer solution that can improve the reliability of underwater acoustic communication links. However, the communication in the underwater environment has the characteristics of large propagation delay, multipath propagation and limited bandwidth, which brings new challenges to the realization of communication, making the technology designed for terrestrial wireless communication not suitable for underwater acoustic communication . [0003] In underwater acoustic cooperative communication, the information sent by...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of large propagation delay of the existing underwater acoustic channel, the present invention proposes an underwater decoding interleave-forward (UDIF, Underwater Decode-Interleave-Forward) cooperation strategy for the underwater acoustic cooperative communication system, and then, based on this strategy, A joint multi-branch combination (MC, Multi-Branch Combining) and Turbo Equalization Detector (TED, Turbo Equalization Detector) is proposed. In order to compensate the influence of the underwater acoustic channel and achieve diversity gain, the detector jointly realizes Turbo equalization, Multi-user detection and merging techniques, in the implementation of the detector, the detector iteratively adjusts the detector by exchanging soft information according to the log-likelihood ratio estimation of the Turbo processing stage; in addition, at each iteration, the The combination coefficients of the signals of nodes and relay nodes are updated according to the steady-state mean square error of each branch. Therefore, the proposed detector can detect signals from Effectively combine the signals of the source node and the relay node

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