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联合检测是TD-SCDMA中计算压力最大的一项任务,为此,人们作了深入的研究以简化其计算复杂度。其中最有效的是基于块FFT的块三角分解方法。然而,现有的方法是把系统矩阵做一个块循环近似,然后才能作块三角分解。文中再介绍两种,通过这两方法把系统矩阵修改为块循环矩阵,修改前后系统方程严格相等。由于这种严格相等的特点,均衡后符号间干扰完全消除,从而解调性能大大提高。
Joint detection is one of the most computationally intensive tasks in TD-SCDMA. Therefore, in-depth research has been conducted to simplify its computational complexity. The most effective of these is block FFT based block-triangle decomposition. However, the existing method is to make the system matrix a block-cycle approximation and then to make a block-triangle decomposition. The article introduces two more, by these two methods to modify the system matrix into a block circulant matrix, before and after the modification of the system equations strictly equal. Because of this strict equality, the interference between symbols is completely eliminated after the equalization, and the demodulation performance is greatly improved.