rake reciever ppt
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The document discusses the Rake receiver, which is used to counter the effects of multipath fading in wireless communications. It works by using multiple "fingers" to collect different time-shifted versions of the original signal transmitted over multiple paths. Each finger correlates and extracts one of the multipath components. The outputs are then weighted and combined to provide a better estimate of the transmitted signal. This allows the Rake receiver to equalize the effects of multipath and improve the signal-to-noise ratio. While useful for CDMA, W-CDMA and other technologies, Rake receivers are also more complex and expensive than conventional receivers.
rake reciever ppt
- 1. RAKE RECEIVER PRESENTED BY- DIVYA SHUKLA
- 2. Learning Objectives Multipath Rake- Introduction How does it works? Role of Rake Receiver Block diagram Use, Advantage, Disadvantage Conclusion
- 3. Multipath Multipath occurs when RF signal arrives at the destination via different paths due to the reflected transmitted signal from moving or fixed objects. The RAKE receiver uses a multipath diversity principle. – It rakes the energy from the multipath propagated signal components.
- 4. What is Rake Receiver? A Rake Receiver is radio receiver designed to counter the effects of multipath fading. Several “sub-receivers” called fingers are used. RAKE receiver attempts to collect the time-shifted versions of the original signal by providing a separate correlation receiver for each of the multipath signals.
- 5. BLOCK DIAGRAM OF RAKE RECEIVER
- 6. M- Branch Rake Receiver
- 7. How Does It Works? The outputs of each correlator are weighted to provide better estimate of the transmitted signal than provided by a single component. Demodulation is then based on the weighted outputs of the M- correlators.
- 8. Role of rake receiver Equalize the effects of multipath. Spread out the individual echo signals of the multipath Each signal is then delayed according to peaks found in the receiver signal.
- 9. USES OF RAKE RECEIVER CDMA & W-CDMA radio devices – Mobile Phones & Wireless LAN. Radio astronomy ADVATAGES OF RAKE RECEIVER Improved SNR Improved performance DISADVANTAGES OF RAKE RECEIVER Cost Size Complexity
- 10. Conclusion Rake receiver is used in CDMA and W-CDMA as an efficient way of multipath signal reception, where several receptors are able to reconstruct the signal with different time-codes, amplitude and phase.
- 11. THANKYOU for your patience listning..!!