An Adaptive Resource Allocation Method Based on Underwater Acoustic Time-varying Channel Correlation

Abstract

The invention provides an adaptive resource allocation method based on underwater acoustic time-varying channel correlation. Obtain the outdated channel state information by sending the data instruction message RTS in the handshake process, calculate the correlation of the channel state information estimated by the test signal Test signal and the RTS signal as the underwater acoustic time-varying channel correlation, and use the correlation coefficient as the weight value, Together with the channel state information fed back, it is used as an allocation basis for adaptive resource allocation. The present invention is simple and easy to implement, and the amount of calculation is small. Aiming at a specific node, the size of the correlation coefficient on each carrier is compared, and for a carrier with a smaller correlation coefficient, the validity as a basis for self-adaptive allocation is low. This method can effectively reduce the impact of time-varying underwater acoustic channel on resource allocation performance.

Description

technical field [0001] The invention relates to an underwater acoustic communication network technology, in particular to an adaptive resource allocation method. Background technique [0002] The time-varying, space-varying, and frequency-varying characteristics of the underwater acoustic channel make it a complex and fast-changing wireless channel. In order to ensure that the system can achieve the expected performance under various channel conditions, the modulation and coding parameters of the underwater acoustic channel are often A fixed method designed according to the worst condition of the channel state is adopted, which leads to the inability of the channel capacity to be fully utilized. Therefore, if we can use adaptive modulation and parameter selection on the basis of channel estimation based on the characteristics of time-space-frequency variation of the underwater acoustic channel, timely use favorable channel conditions and avoid unfavorable channel conditions,...

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Problems solved by technology

[0003] In the known underwater acoustic adaptive OFDMA systems, it is usually assumed that the channel is constant for a period of time, or the outdated channel state information is directly used for feedback. For example, the Seventh International Conference onUbiquitous and Future Networks magazine published in 2015 A heuristic resource allocation method for underwater acoustic uplink OFDMA system is proposed in the paper "A heuristic resource allocation method for underwater uplink OFDMA system", which assumes that the channel state information is constant during the period of channel estimation and resource allocation; In the paper "Adaptive OFDMA with partial CSI for downlink underwater acoustic communications" published by Journal of Communications & Networks in 2016, a joint subcarrier bit power resource allocation method for underwater acoustic downlink OFDMA system is proposed, but the resource allocation method does not consider the underwater acoustic channel time-varying effects

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