How does Rake receiver work?

How does Rake receiver work?

A rake receiver is a radio receiver designed to counter the effects of multipath fading. Each finger independently decodes a single multipath component; at a later stage the contribution of all fingers are combined in order to make the most use of the different transmission characteristics of each transmission path.

How the rake receiver in the CDMA system improves s n?

RAKE receiver, used specially in CDMA cellular systems, can combine multipath components, which are time-delayed versions of the original signal transmission. This combining is done in order to improve the signal to noise ratio (SNR) at the receiver.

Why rake receiver is so important for the reception of cellular signals?

Due to reflections from multiple obstacles in the environment, the radio channel can consist of multiple copies of the transmitted signal having different amplitude, phases or delays. A rake receiver can resolve this issue and combine them. Rake receiver then feeds them to different fingers (correlators).

How many types of rake receiver are there?

The probe work acts upon of the broadcasting bandwidth on the system performance using several types of Rake receivers such as All-RAKE (ARake), Selective-RAKE (SRake), Partial-RAKE (PRake), Adaptive Selective Rake (ASRake), Reduced Ramification RAKE (RC-Rake), A FlexRake, G-Rake and LMMSE Rake Receiver.

Which is more effective and commonly preferred technique?

4. Which is more effective and commonly preferred technique? Explanation: Most commonly used and more effective diversity technique is spatial diversity technique. Explanation: Diversity technique does not require training overhead at the transmitter and also provides significant link performance.

What is the main purpose of RAKE receiver Mcq?

Explanation: RAKE receiver uses separate correlation receivers to provide the time shifted version of the original signal for each of the multipath signal. CDMA receivers combine these time shifted versions of the original signal to transmission in order to improve the signal to noise ratio of the receiver.

Which is not an advantage of CDMA?

CDMA channel isn’t effectively decodable thus it offers increments cell correspondence protections. Call quality is better with more predictable sound when contrasted with GSM.

What is RAKE receiver explain the same with block diagram?

The RAKE receiver block diagram is mentioned in the figure. The RAKE receiver receives the signals from multiple paths and combine them suitably with different appropriate delays. This way it recovers the transmitted signal. The complete principle of Rake receiver is explained in the figure.

What is breathing cell effect MCQS?

Explanation: Breathing cell is a concept used by CDMA systems. Explanation: One of the main problems with adjacent channel interference is the near-far effect. It occurs when a mobile close to a base station transmits on a channel close to one being used by a weak mobile.

What should you do if your hand touch the sink while you are washing your hands?

What should you do if your hands touch the sink while you are washing your hands? It is important to remove all the soap from your wrists and hands; keeping your hands up and your elbows down to rinse away the microorganisms.

Which of the following is used by Rake receiver?

Explanation: RAKE receiver is essentially a diversity receiver which is used specifically for CDMA. It uses the fact that the multipath components are practically uncorrelated from one another when their relative propagation delays exceed a chip period.

Which is more effective and commonly preferred techniques?

4. Which is more effective and commonly preferred technique? Explanation: Most commonly used and more effective diversity technique is spatial diversity technique. Explanation: As the time span increases, the fading is more uncorrelated and effectiveness also increases.

Can a rake receiver detect a DS-CDMA signal?

In a multipath channel, delayed reflections interfere with the direct signal. However, a DS-CDMA signal suffering from multipath dispersion can be detected by a rake receiver. This receiver optimally combines signals received over multiple paths. Figure: Rake receiver with 5 fingers

How does a rake receiver recover a signal?

In the cellular systems this multipath interference is exploited to recover the transmitted signal. The RAKE receiver block diagram is mentioned in the figure. The RAKE receiver receives the signals from multiple paths and combine them suitably with different appropriate delays. This way it recovers the transmitted signal.

What’s the purpose of a rake in a cell phone?

The dictionary meaning of rake is to gather or collect together something and actually is a garden tool to collect leaves. But in the terms of computer network, it is for the purpose of collecting signals from multiple paths arriving at the receiver end and used specially in CDMA cellular systems.

What kind of filter does a rake receiver use?

The rake receiver is designed to optimally detected a DS-CDMAsignal transmitted over a dispersivemultipath channel. It is an extension of the concept of the matched filter. Figure: Matched filter receiver for AWGN channel.