Abstract：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.
2013, Vol. 35 
