LTE-A系统中下行MIMO检测的设计与实现

Design and Implementation of Downlink MIMO Detection in LTE-A System

基于对MIMO-OFDM系统中信号检测算法的研究,设计了一种适用于LTE-A下行物理层接收机的MIMO检测方案。采用了一种基于子载波顺序检测的思想,针对发射分集和空间复用等传输场景下选取了复杂度较低且性能良好的MMSE检测算法,并给出MMSE检测器的FPGA设计方案。对于矩阵求逆模块,通过cholesky分解简化为下三角矩阵求逆问题并通过脉动阵列实现。最后以XC7Z045为硬件平台,通过仿真验证了该方案的准确性及可行性,该方案现已成功应用到LTE-A空口检测仪表项目中。

Based on the research of signal detection algorithm inMIMO-OFDMsystem,design aMIMO detection scheme,which is suitable for LTE-A downlink physical layer receiver.The order of detection module is decided by sub-carrier.According to the transmission scenarios such as transmit diversity and spatial multiplexing,the MMSE detection algorithm is selected for its low complexity and good performance,and a FPGA design scheme of MMSE detector is given.For the matrix inversion module,the matrix is changed to the lower triangular form,which is simplified by cholesky decomposition and implemented by systolic array.Finally,the XC7Z045 is used as the hardware platform to verify the accuracy and feasibility of the scheme.This scheme has been successfully applied to the LTE-A air interface instrumentation project.