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- Title
基于快速沃尔什-哈达玛变换的OVSF 码盲识别算法.
- Authors
刘剑锋; 郭晋宏; 王光育; 徐国微; 冯华
- Abstract
Based on the in-depth study of the recursive construction principle, code tree structure model, mathematical theory foundation and distribution principle of orthogonal variable spreading factor (OVSF) code, a blind recognition algorithm based on fast walsh-hadamard transform for non-cooperative reception of wideband code division multiple access (WCDMA) signals is proposed. By using the inheritance relation and orthogonal property of OVSF code as well as the cyclic shift of data, and combining with the fast walsh-hadamard transform, the proposed algorithm eliminates the ambiguity of de-spreaded data and reduces the computational complexity. Theoretical analysis and experimental results show that the proposed algorithm can perform rapid de-spread and blind recognition of multiple OVSF codes in the downlink channel of the WCDMA system under the conditions of non-cooperation, no prior information and low signal-to-noise ratio, which is very reliable, effective and practical. In the actual measurement, this algorithm costs 8.2 ms to complete the recognition of at least 20 OVSF codes in three frames of data simultaneously, and the recognition accuracy is more than 95%, which has high engineering application value.
- Subjects
SIGNAL-to-noise ratio; HADAMARD matrices; INFORMATION measurement; SIGNAL processing; ENGINEERING instruments
- Publication
Journal of Data Acquisition & Processing / Shu Ju Cai Ji Yu Chu Li, 2021, Vol 36, Issue 1, p184
- ISSN
1004-9037
- Publication type
Article
- DOI
10.16337/j.1004-9037.2021.01.018