Code spreading multiple access (CDMA) spread spectrum device and its method for wireless multimedia services at various rates

摘要

1. The technical field to which the invention described in the claims belongs;The present invention relates to a spread spectrum code division multiple access (CDMA) spreading apparatus and a method thereof.;2. Technical challenges to be solved by the invention;The present invention relates to a spreader for performing both spreading by orthogonal codes and spreading by long pseudo noise codes having code offsets to accommodate data of various rates,;3. The point of the solution of the invention;In order to accommodate various user data rates, spreading by an orthogonal code and spreading by a long pseudo noise (PN) code having the same code offset are performed according to the speed of a digital bit input to a user channel, Spreading by a long pseudo noise (PN) code having different code offsets without performing spreading by the spreading code, it is possible to easily accommodate user information at various rates regardless of the type of service, Can be reduced.;4. Important Uses of the Invention;The present invention is applied to various systems of a code division multiple access (CDMA) scheme.