Details

Autor(en) / Beteiligte

• QIU, P. Y
• HUANG, Z. T
• JIANG, W. L
• ZHANG, C

Titel

Blind multiuser spreading sequences estimation algorithm for the direct-sequence code division multiple access signals

Ist Teil von

• IET signal processing, 2010-10, Vol.4 (5), p.465-478

Ort / Verlag

Stevenage: Institution of Engineering and Technology

Erscheinungsjahr

2010

Beschreibungen/Notizen

• By combining the multiple signal classification (MUSIC)-based algorithm and segmentation-based idea, a blind multiuser spreading sequences estimation algorithm for the direct-sequence code division multiple access (DS-CDMA) signals is presented in this study. The proposed algorithm aims to divide the spreading sequences into short-time segments to recover them in a sequential procedure. First, the received signal samples are divided into K collections of temporal windows. Secondly, the first short-time segments of all the users' spreading sequences are extracted. Finally, the remaining segments of the spreading sequences can be recovered chip-by-chip through K - 1 subspace projection loops. This algorithm can be applied not only to the synchronous short-code (SC) DS-CDMA signals, but also to the long-code DS-CDMA signals in non-cooperative contexts, even with minus SNR. The simulations are presented to illustrate the performance of the proposed method. In addition, for the synchronous SC-DS-CDMA signals, the computational cost of the proposed algorithm is much lower than that of the MUSIC-based algorithm.