一种基于海上甚高频数据交换系统(VDEs)的自适应QAM改进算法

An Enhanced Adaptive QAM Algorithm for Maritime VHF Data Exchange System(VDEs)

由于传输速率较低的低阶调制能够保障可靠传输,而传输速率较高的高阶调制能够提升系统容量,对于海上甚高频时变衰落的无线信道,我们需要折中考虑数据传输速率和误码率,因此本文提出一种自适应子带划分的多进制QAM算法(ASD-MQAM),根据当前信道的状态自适应地选择合适的不同进制QAM调制方式,以适应信道动态变化、优化发射功率,提高海上VDEs通信系统的性能。

For the Low-order modulation with low transmission rate provides reliable transmission,and the high-order modulation improves the system capacity,we need to compromise the data transfer rate and BER in VHF time-varying fading wireless channels.In this paper,we propose the multi-band QAM algorithm based on an adaptive sub-band division(ASD-MQAM).According to the current state of channels,the ASD-MQAM can select the appropriate Multi-band QAM modulation in order to meet the channel’s dynamic changes and optimize the transmit power.The simulation results show that the proposed algorithm can improve the performance of the maritime VDEs communication system.