What is meant RAKE receiver?
A rake receiver is a radio receiver designed to counter the effects of multipath fading. It does this by using several “sub-receivers” called fingers, that is, several correlators each assigned to a different multipath component.
What are the benefits of RAKE receiver?
A Rake Receiver is a radio receiver which is designed for the purpose to counter the effects of multipath fading. 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.
How RAKE receiver improves the gain?
RAKE receiver combines all multipath components of original transmitted signal in order to improve signal to noise ratio at receiver. It provides separate correlation receivers for each multipath component to combine all multipath components.
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.
How many fingers has a RAKE receiver in UMTS?
For the first-generation of UMTS handsets, RAKE receiver will be used as the receiver of choice. In a RAKE receiver, one RAKE finger is assigned to each multipath, thus maximizing the amount of received signal energy.
Who uses rake receivers?
Radio astronomers were the first substantial users of rake receivers in the late 1960s to mid-1980s as this kind of receiver could scan large sky regions yet not create large volumes of data beyond what most data recorders could handle at the time.
What is a UWB radio system?
A UWB radio system can be used to determine the “time of flight” of the transmission at various frequencies. This helps overcome multipath propagation, since some of the frequencies have a line-of-sight trajectory, while other indirect paths have longer delays.
What are the hardware requirements of an rake receiver?
Rake receivers must have either a general-purpose CPU or some other form of digital signal processing hardware in them to process and correlate the intended signal. Rake receivers only became common after 16-bit CPUs capable of signal processing became widely available.
What is ultra-wideband (UWB)?
Ultra-wideband was formerly known as pulse radio, but the FCC and the International Telecommunication Union Radiocommunication Sector (ITU-R) currently define UWB as an antenna transmission for which emitted signal bandwidth exceeds the lesser of 500 MHz or 20% of the arithmetic center frequency.