Cross-layer communication method for OFDM link physical layer and MAC layer of underwater acoustic communication network

Abstract

The invention provides a cross-layer communication method for an OFDM (Orthogonal Frequency Division Multiplexing) link physical layer and an MAC (Media Access Control) layer of an underwater acoustic communication network. Based on the purposes of reasonably allocating channel resources and improving the throughput of the network, the performance of the network is optimized by a cross-layer data interaction method for a physical layer and an MAC layer. The physical layer adaptively adjusts the modulation order, coding rate and frequency diversity order according to an underwater acoustic channel environment, thus realizing data transmission of different rates to adapt to a fast time-varying underwater acoustic channel; the MAC layer adopts an improved CSMA (Carrier Sense Multiple Access ) / CA (Collision Avoidance) protocol, thus improving the retransmission success rate of data packets and reducing the data transmission delay; and the cross-layer design between the physical layer and the MAC layer solves the problems of high packet loss rate and low transmission efficiency caused by fast time variation, long transmission delay and other factors of the underwater acoustic channel, thus improving the throughput of the underwater acoustic communication network and the spectral efficiency of the system.

Description

technical field [0001] The invention relates to an underwater acoustic wireless sensor network, in particular to a cross-layer communication method between an OFDM link physical layer and a MAC layer in an underwater acoustic communication network. Background technique [0002] 70% of the earth's surface is covered by oceans, and the vast oceans contain huge resources. Today, with the global terrestrial resources becoming increasingly tense and the environment deteriorating, countries all over the world are turning their attention to the ocean. The development of marine resources and the development of marine economy have become important planning directions for various maritime countries. The underwater acoustic communication network is an effective means to obtain marine environmental parameters, and plays a very important role in marine environmental monitoring, marine resource development, natural disaster early warning, port and near-shore detection, etc. For some unde...

AI Technical Summary

Problems solved by technology

In the above literature, the influence of the fast time-varying underwater acoustic channel on the physical layer and the MAC layer and the close connection between the two layers are not considered.

Images