Cdma standard network architecture

CDMA signal generation

orthogonal code
information
picture 3
The use of the CDMA method consists of a significant artificial expansion of the base of the primary signal (subscriber's voice), which is carried out in two main ways:
The use of the CDMA method consists of a significant artificial expansion of the base of the primary signal (subscriber's voice), which is carried out in two main ways:
Direct extension - direct sequence spread spectrum (DSSS)
Carrier frequency jump - frequency hop spread spectrum (FHSS)

Basic description and technical parameters of Qualcomm CDMA standard

MS signal frequency range	824,040 – 848,970 MHz
BTS signal frequency range	869.040 – 893.970 MHz
Relative instability of MS carrier frequency	± 2,5 *10-6
Relative instability of BTS carrier frequency	± 5 *10-8
Relative instability of modulation type	QPSK (BTS), O-QPSK (MS)
The width of the transmitted signal spectrum is 3 dBThe clock frequency of the PTK is 40 dB	1,25 MHz 1,50 MHz 1,2288 MHz
The number of elements in the PTKFor MS for BTS	32768 bit 242 – 1 bit

The number of channels on 1 carrier of BTS	1 pilot channel 1 alarm channel 7 personal call channels 55 communication channels
The number of channels of the MS