By Topic

Performance enhancements to the UMTS (W-CDMA) initial cell search algorithm

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Kiessling, M. ; Res. Dept., Wireless Syst., Murray Hill, NJ, USA ; Mujtaba, S.A.

The purpose of the cell search algorithm in UMTS is to estimate the spreading code of the serving base-station and its corresponding timing offset. The search procedure consists of 3 sequential and distinct stages: (1) slot-boundary synchronization, (2) frame-boundary synchronization with code-group identification, and (3) scrambling code identification. Algorithms that have appeared in literature for cell search have confined the "code-time" estimation in each stage to a single hypothesis. Furthermore, these algorithms have neither considered the benefits of oversampling, nor the detrimental effects of non-ideal sampling that may arise due to clock jitter and/or residual frequency offset. We study the performance benefits of estimating multiple "code-time" hypotheses in each stage of the cell-search process. In addition, we also study the effect of oversampling and non-ideal sampling. Our results indicate that, in the presence of non-ideal sampling, performance improves significantly if the received signal is oversampled by a factor of 4 or more. We also show that estimating 4 "code-time" hypotheses instead of 1 in the cell-search stages reduces the search-time (i.e. the code-acquisition time) considerably, in particular at low SINR

Published in:

Communications, 2002. ICC 2002. IEEE International Conference on  (Volume:1 )

Date of Conference: