Patent ID: 6813239
Filing Date: 2004-11-02
Classification: H04B

Abstract:
A dual transmission spread processing circuit system for a CDMA communication apparatus, comprising:dual transmission spread processing circuits each including a spread processing section for spread modulating transmission data of a plurality of channels, an addition synthesis section for addition synthesizing a plurality of spread signals processed by said spread processing section, an output selection section for selecting whether or not a synthetic spread signal of said addition synthetic section should be outputted, a failure detection section for detecting a failure, and a control section; said spread processing section of each of said transmission spread processing circuits including two sections of an operating system spread processing section and a standby system spread processing section; said addition synthesis section addition synthesizing spread signals processed by said operating and standby system spread processing sections separately from each other; each of said transmission spread processing circuits including an addition selection section for selecting whether or not the operating system spread signal and the standby system spread signal should be addition synthesized; said addition selection section being controlled with a failure detection signal from said failure detection section of the other one of said dual transmission spread processing circuits.