Experiments on Fast Cell Search Algorithm Using Scrambling Code Masking for Inter-Cell Asynchronous W-CDMA System (Special Section on Spread Spectrum Techniques and Applications)

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This paper presents the fast cell search time performance based on laboratory and field experiments of a 2-step cell search algorithm that uses scrambling code masking for inter-cell asynchronous wideband DS-CDMA (W-CDMA) mobile radio. The scrambling code is masked at different time positions during each scrambling period on the forward-link common control channel (CCH) to detect the scrambling code timing at the mobile receiver. Experiments were conducted using the CCH-to-dedicated traffic channel (DTCH) power ratio, R of 3dB, 10 DTCHs, and 16 scrambling codes in a single-cell and two-cell models. The field experimental results show that the cell search time of about 600 msec was achieved in vehicular environments at the detection probability of 90% and the average received E_b/N_0 (N_0 is the background noise without interference) of 13-15dB for DTCH, even in the worst case scenario when the received signal power ratios of the CCH from two cell sites were 0dB. The cell search time that was achieved with the 3-step cell search algorithm previously proposed by the authors is estimated from the experimental results; the cell search can be accomplished within about 720msec at a probability of 96% for 512 scrambling codes and 16 scrambling code groups.
社団法人電子情報通信学会の論文
2000-11-25