水声软频率复用网络的干扰缓解与资源分配

为降低基于频率复用水声网络系统的小区间干扰,以及提高系统平均吞吐量,提出了一种基于时延差的软频率复用(T-soft frequency reuse,T-SFR)系统,对小区间的干扰抑制和小区内的自适应资源分配两个问题进行优化.在小区间,提出了T-SFR利用不同信道之间的时延差进行干扰缓解,并基于水声信道的路径损耗进行频...

Soft Frequency Reuse for Underwater Acoustic Networks with Interference Mitigation and Resources Allocation

In order to reduce the inter-cell interference caused by frequency reuse underwater acoustic network system, improve the system spectrum efficiency, this paper proposed a soft frequency reuse (T-SFR) system based on time delay difference and optimized interference suppression for inter-cell and adaptive resource allocation for inner-cell. For inter-cell, the T-SFR used the delay difference between different channels to mitigate interference, and allocated frequency bands based on the path loss of the UWA channel. For inner-cell, a linear finite state Markov chain (LFSMC) predictor was established for the effect of the feedback channel state information (CSI) delay caused by the time-varying characteristics of the UWA channel to obtain more accurate CSI to adaptive resource allocation. The simulation results show that the T-SFR scheme proposed in this paper can guarantee the requirements of the cell edge nodes on the signal to noise ratio (SINR), and effectively alleviate the interference of the cell edge nodes. With the more accurate CSI obtained by LFSMC forecaster, the better throughput can be obtained in the cell and the whole system of time-varying underwater acoustic network.