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中文摘要：
针对TD—SCDMA突发信号盲解扰与盲解扩的问题，该文提出了一种基于模糊酉矩阵组合码盲估计的方法。该方法将TD—SCDMA系统中短扩频码与固定长度的扰码一起视为小区的扩频码，即组合码，首先根据用户midamble码自身高度的相关性进行midamble码捕获和载波残余频偏估计；然后根据midamble码所处的相对位置，以扰码长度为周期对数据域信号进行分段截取，最后利用相关函数二阶矩、奇异分解法以及消除模糊关系的酉矩阵法，即可完成组合码的盲估计。仿真结果表明，该算法具有良好的估计效果，而且在估计复组合码前，无需估计组合码的周期。
英文摘要：
A combination code estimation method based on the fuzzy unitary matrix is proposed for the blind descrambling and dispreading of the TD-SCDMA burst signal. The method take the short spreading code and the scrambling code of the fixed length together as the district＇s spreading code of TD-SCDMA system, also named the combination code. Firstly, according to the relevance of midamble code＇s height to acquire the midamble code and to estimate the residual of carrier frequency. And then according to the midamble code＇s relative position to intercept the data domain signal with the length of the scrambling code. Finally, the blind estimation of the combination code can be achieved by using the second-order moments of the correlation function, the singular value decomposition method and the unitary matrix method of the eliminating fuzzy relations. Simulation results show that the algorithm has a good effect, and it is unnecessary to estimate the combination code＇s cycle before the estimation of combination code.
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