| 摘要: |
| 针对已有动态信道分配策略在阴影衰落环境中性能损失较大的问题，对卫星移动通信系统的阴影衰落信道模型进行分析，提出了一种动态信道分配策略。该策略结合用户的运动状态，通过在用户的预测运动轨迹上选取抽样点，将这些抽样点的平均干扰作为信道分配的指标，并采用链路质量约束避免了流量较大时的性能恶化。仿真结果表明提出的动态信道策略可在不增大阻塞率的前提下，在中低流量时将用户平均信噪比提高约0.5 dB。该策略可以应用于阴影衰落信道下的地面移动卫星通信系统，以提高用户的平均链路性能。 |
| 关键词: 卫星移动通信；阴影衰落信道 动态信道分配；信道模型；链路质量约束 |
| DOI： |
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| 基金项目:国家高技术研究发展计划(863计划)项目（2012AA01A502）;国家科技重大专项（2013ZX03006001-005） |
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| A dynamic channel assignment scheme of multi-beam satellite mobile communication system in shadowed fading channel |
| LI Hang,ZHAO Ming,WANG Jing |
| () |
| Abstract: |
| The performance of existing dynamic channel assignment schemes is significantly degraded in shadowed fading environment.To solve the problem,the shadowed fading channel model of satellite mobile communication system is analyzed,and a new dynamic channel assignment scheme is proposed.In the proposed scheme,the channel is assigned according to the average interference of the sampling positions,which are chosen by predicting user’s trajectory.Link quality restrict is also applied to avoid performance degradation in case of heavy traffic.Simulation results show that the users’ average signal-to-noise ratio(SNR) is improved by about 0.5 dB in case of low and medium traffic,while the blocking rate is not increased.The proposed scheme can be adopted in land mobile satellite communication system in shadowed fading channel,in order to improve the average link performance for users. |
| Key words: satellite mobile communication shadowed fading channel dynamic channel assignment channel model link quality restrict |
