How is power control done in CDMA?
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.
Why is power control important in CDMA?
Power control is essential for the smooth operation of a cdma system. Because all users share the same rf band through the use of pn codes Each user looks like random noise to other users.
What power control mechanism is used in WCDMA?
II. Power control in WCDMA is a closed-loop PC which is a combination of outer and inner closed loop control (see Figure 1). The inner (also called fast) closed loop PC adjusts the transmitted power in order to keep the received Signal-to-Interference Ratio (SIR) equal to a given target.
What is power control in cellular communication system?
Power control, broadly speaking, is the intelligent selection of transmitter power output in a communication system to achieve good performance within the system.
Why power control is required Give two reasons?
Techopedia Explains Power Control Typically, power control allows the transmission or signal power to be scaled, which results in better signal quality. However, power control algorithms are also designed to not scale the power unnecessarily high.
Which hand off used in CDMA?
Soft handover or soft handoff refers to a feature used by the CDMA and W-CDMA standards, where a cell phone is simultaneously connected to two or more cells (or cell sectors) during a call. If the sectors are from the same physical cell site (a sectorised site), it is referred to as softer handoff.
What is open loop power control?
Open Loop Power Control Measurement Description 1.3, the open loop power control is the ability of the UE transmitter to sets its output power to a specific value. The open loop power control measurement can only be initiated when the Operating Mode is Active Cell and the call status is Idle.
Why is power control used in CDMA 2000 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.
What do you understand by power and control?
In telecommunications, power control refers to the process of controlling the power of a transmitter to achieve better communication signal or overall quality of service. It is mainly used to control the transmitting power of a communication device to achieve better performance.
What is power control LTE?
Power Control is the mechanism through which the UE and the eNodeB handle the attenuation of the signal. There are two types of Power Control mechanisms as per Control Theory and LTE uses both of them. They are: Open Loop Power Control. Closed Loop Power Control.
What are the features of CDMA?
Some of the key features of CDMA are:
- 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.
What is the power control in CDMA?
CDMA – Power Control. In CDMA, since all the mobiles transmit at the same frequency, the internal interference of the network plays a critical role in determining network capacity. Further, each mobile transmitter power must be controlled to limit the interference.
How to control the transmission power of each user?
We need to control the transmission power of each user. This control is called the transmission power control (Control Power). There are two ways to control the transmission power. First is the open-loop (Open Loop) control and second is closed-loop (Closed Loop) control.
How does a CDMA network work?
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 need of power control?
Power control is essentially needed to solve the near-far problem. The main idea to reduce the near-far problem, is to achieve the same power level received by all mobiles to the base station. Each received power must be at least level, so that it allows the link to meet the requirements of the system such that Eb/N0.
