How is power control done in CDMA?
In CDMA, each user’s transmission power is allocated by the control power to achieve the same power (Pr) which is received by the base station/BTS with access probe with low power. The mobile sends its first access probe, then waits for a response from the base station.
What is the general frequency range for a CDMA network?
The band used in CDMA is 824 MHz to 894 MHz (50 MHz + 20 MHz separation). Frequency channel is divided into code channels.
Why is power control used in CDMA2000 and WCDMA?
The power control in cdma 2000 and WCDMA is to minimize interference due to presence of other mobile users, fading, log normal shadowing as well as from fast Rayleigh fading.
How is power control applied in forward CDMA channel?
Power control commands are sent to each subscriber unit on the forward control subchannel which instruct the mobile to raise or lower its transmitted power in 1 db steps. If the received signal is low 0 is sent over power control subchannel instructing the mobile station to increase its mean output power level.
What is a power control system?
A power control system (PCS) shall be listed and evaluated to control the output of one or more power production sources, energy storage systems (ESS), and other equipment. The PCS shall limit current and loading on the busbars and conductors supplied by the PCS.
What is the difference between Cdma2000 and WCDMA?
Cdma2000 is a 3G technology evolved from IS-95 CDMA technique. WCDMA is a 3G technology evolved from GSM technology….Welcome back.
| Cdma2000 | WCDMA | |
|---|---|---|
| Channel bandwidth | 1.25 MHz (1X), 3.75 MHz (3X) | 5.0 MHz |
| Channelization codes | 4-128 (1X), 4-256 (3X) | 4-256 |
What are the features of CDMA?
Features of CDMA
- Used in Global Positioning System (GPS)
- Every channel uses full available spectrum.
- Better capacity for voice and data communications.
- CDMA does not require synchronization.
- Allocation of code word to each user helps to reduce interference.
Does frequency change in handoff?
In CDMA cellular system, communication does not break even at the moment doing handoff, because switching frequency or timeslot is not required.
What are different controls of power system?
Power system controls are of many types including [1, 21, 37] generation excitation controls, prime mover controls, generator/load tripping, fast fault clearing, high-speed re-closing, dynamic braking, reactive power compensation, load–frequency control, current injection, fast phase angle control and HVDC special …