摘要
分析在多径CDMA信道中空时多用户检测的信道模型,从理论上推导出信道脉冲响应矩阵必须满足的条件.重新定义多个用户的均方误差,利用最陡下降方法求解空时多用户检测的最优权因子,并通过估计迭代表达式中的相关系数,提出一种在多径CDMA信道下低复杂度的空时多用户检测算法.该算法不需要求解矩阵的逆,只需求解复杂度较低的迭代系数,与经典的线性最小均方误差(MMSE)算法相比,显著降低了计算复杂度.仿真结果表明,该算法具有稳定的收敛性和良好的检测性能.
Analysing the channel model of spacetime multiuser detection in multipath CDMA channels, this paper confirms to the condition of channel impulse response matrix. The users' mean square error is defined in a new form,and the optimal factor is achieved by using a steepest descent algorithm. Estimating the related parameter of iterative formula, this paper presents a less complex spacetime multiuser detection algorithm in multipath CDMA channels. The algorithm does not require to solve for the matrix's inverse, save for a much less complex iterative parameter. The new algorithm reduces the complexity remarkably compared with the classical linear MMSE algorithm. Simulation results illustrate that the new algorithm can offer stable convergence and good detection performance.
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2003年第3期350-353,共4页
Transactions of Beijing Institute of Technology
基金
国家自然科学基金资助项目(60272025)
关键词
阵列天线
空时多用户检测
波达方向
最小均方误差
array antenna
space-time multiuser detection
direction of arrival
minimum mean square error
