联合检测是TD-SCDMA的关键技术之一。传统的联合检测技术虽然得到很好的性能,但复杂度高。提出一种快速算法,将联合检测的系统矩阵扩展成块循环矩阵,利用块FFT和块循环矩阵进行快速矩阵求逆和简化矩阵运算。矩阵求逆的运算量最大可下降到O(nlog2n),且存储量成倍下降。仿真实验表明,该算法和直接计算得到的系统性能一致,但运算时间大大下降。 Joint detection is one of the key technologies of TD-SCDMA. Although the traditional joint detection technology has been very good performance, but the complexity is high. A fast algorithm is proposed to extend the system matrix of joint detection into a block cyclic matrix. The block FFT and block cyclic matrix are used to perform fast matrix inversion and simplify matrix operations. The computational complexity of the matrix inversion can be reduced to O (nlog2n) maximally, and the storage capacity decreases exponentially. Simulation results show that the proposed algorithm has the same performance as the direct calculation, but the operation time is greatly reduced.