适用于多载波共频谱传输的干扰消除方式

Research on Interference Cancellation for Bandwidth-shared Multi-carrier Transmission System

针对多载波共频谱传输应急卫星通信系统,各干扰载波互不相关,且干扰载波的功率远大于扩频信号的功率,干扰载波对扩频信号存在严重的干扰,因此对于扩频信号的恢复,载波重构与干扰消除处理是必须的。对于多载波干扰消除其实现方式可分为串行干扰消除和并行干扰消除2种,为此分析和比较了2种典型实现方式,提出了基于数字重采样的改进方案。分析结果表明,基于数字重采样的串行干扰方式更适合多载波共频谱传输应急系统卫星通信系统的应用。

For the emergency satellite communication system using bandwidth-shared multi-carrier transmission, the interference carriers are not correlated, and the power of interference carrier is much more higher than that of communication carrier, so the interfer- ence cancellation is necessary. Two typical interference cancellation methods are analyzed in this paper： successive interference cancel- lation and parallel interference cancellation. And also an improved scheme based on the digital resampling is proposed. The result shows that successive interference cancellation based on digital resampling is suitable for the bandwidth-shared multi-carrier transmission sys- tem better.