关键词: 通信技术, 构造矩阵, 奇异值分解, 多载波调制, 非零奇异值, 盲识别

Abstract:

In order to solve the intra-class blind recognition problem of IFFT-based multi-carrier modulation signals under the conditions of white Gaussian noise background, a blind identification algorithm of multi-carrier modulation signal is proposed. This algorithm is based on singular value decomposition of structural matrix. Without any prior knowledge of data information, the type and length of the spreading code, this algorithm can determine the type of multi-carrier modulation signal accurately according to the number of larger non-zero singular values of structural matrix in accordance with simple criteria, and achieve good results. It does not need to design the complex classifier in the traditional recognition algorithm after feature extraction, and simplifies the recognition process. Both theoretical analysis and simulation results verified the correctness and effectiveness of the proposed algorithm. Therefore, the algorithm has certain theoretical and practical reference value.

Key words: communication, structural matrix, singular value decomposition, multi-carrier modulation, nonzero singular value, blind recognition