多小区MIMO系统中的一种有限反馈预编码干扰抑制技术

Limited feedback precoding interference suppression scheme in multi-cell MIMO systems

针对多小区MIMO系统中的干扰问题,提出了一种新的具有有限反馈特性的预编码干扰抑制技术.该技术在各发送端采用独立的线性预编码技术对干扰进行有效抑制,并且为了降低反馈信息量,在接收端利用子空间分集理论对干扰子空间进行量化,从而实现了系统的有限反馈.理论分析和仿真结果表明,该方法能够有效地抑制小区间干扰,提高系统的性能;同时本方法具有较低的系统复杂度,极大地节省了反馈所带来的系统开销.

A novel limited feedback precoding method is proposed for interference suppression in cellular MIMO systems. By utilizing linear precoding at each transmitter independently, the inter-cell interference is effectively suppressed. In order to reduce the system feedback load, an interference subspace quantization is exploited based on the Grassmannian subspace packing theory. The inter-cell interference is effectively suppressed and the system performance is significantly improved by this proposed method due to theoretical analysis and simulation results. Moreover, compared with the conventional methods, this technique decreases the complexity at both transmitter and receiver, and greatly saves the system load usedfor information feedback.