[특허]Discountinuous CDMA reception

Discountinuous CDMA reception 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04K-001/00
출원번호	US-0866555 (1992-04-10)
발명자 / 주소	Dent Paul W. (Stehag ESX)
출원인 / 주소	Ericsson/GE Mobile Communications (Research Triangle Park NC 02)
인용정보	피인용 횟수 : 64 인용 특허 : 0

초록 ▼

A cellular radio telephone system employs discontinuous transmission and reception of speech signals to conserve receiver processing resources. A frame structure is imposed on digitized speech data to divide the data into units of fixed transmission time. When no active speech is present for the entire duration of a frame, transmission of that frame of data is inhibited. At the receiver, decoding of received bits is performed to determine correlation with a defined set of code words. If no correlation is found after the first few received bits of a frame, due to the absence of active speech data, decoding is discontinued for the remainder of the frame\s duration. This approach frees up the receiver\s resources for other tasks, such as decoding of other received signals. Frames of data from different sources are transmitted with a defined time alignment to enable the receiver to remain synchronized in the absence of transmitted data. The frames associated with different sources are staggered relative to one another, to distribute processing loads at the receiver.

대표청구항 ▼

An improved transmitter for spread spectrum code division multiple access radio communication signals, having a speech digitizer for speech signals, comprising: means for assembling the digitized speech from the speech digitizer into fixed frames corresponding to a fixed whole number of symbols; means for generating an activity indication for each fixed frame containing speech activity; and means for inhibiting the transmitter when there is no activity and for resuming the transmitter, only at fixed frame times identified by the activity indication.

이 특허를 인용한 특허 (64)

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