Cell searching in a cdma communications system

H - Electricity – 04 – W

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

H04W 56/00 (2009.01) H03M 13/25 (2006.01) H04L 7/04 (2006.01) H04J 13/00 (2006.01) H04B 1/707 (2006.01)

Patent

CA 2301749

A special coding scheme is disclosed for more effectively acquiring a long code and frame timing during a cell search in a CDMA communications system. A code set of length M Q-ary code words including symbols from a set of Q short codes is defined with certain properties. The primary property to be satisfied is that no cyclic shift of a code word yields a valid codeword. The other properties to be satisfied are that there is a one-to-one mapping between a long code message and a valid code word, and a decoder should be able to find both the random shift (thereby implicitly finding the frame timing) and the transmitted code word (i.e., its associated long code indication message) in the presence of interference and noise, with some degree of accuracy and reasonable complexity.

La présente invention concerne un mécanisme spécial de codage permettant d'acquérir plus efficacement un code long et une synchronisation de trame pendant une recherche de cellule dans un système de communications AMDC. Un codet de mots de code Q aire comprend des symboles issus d'un ensemble Q de codets courts possédant certaines propriétés. La première propriété à satisfaire est qu'aucun décalage cyclique d'un mot de code ne vienne correspondre à un mot de code valide. Les autres propriétés à satisfaire sont qu'il y ait une correspondance univoque entre un message de code long et un mot de code valide et qu'un décodeur soit capable de trouver, avec un certain degré de précision et une complexité raisonnable, aussi bien un décalage aléatoire (retrouvant ainsi implicitement la trame de synchronisation) et que le mot de code transmis (c'est-à-dire un message d'indication de code long associé), et ce en présence de brouillage et de bruit.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Cell searching in a cdma communications system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Cell searching in a cdma communications system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cell searching in a cdma communications system will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1921376

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.