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The Rake receiver reduces the effects of fading and provides spectral efficiency improvement of CDMA over other cellular systems. In CDMA systems, the bandwidth (1.25 to 15 MHz) is wider than the coherence bandwidth of the cellular or PCS channel. Thus, when the multipaths are resolved in the receiver, the signals from each tap on the delay ...
Rake Receiver. Due to the reflection on the challenges of a broadband, radio channel can consists of many copies (multipath), signals originally transmitted with different amplitude, phase, and delay. If the signal components arrive over a chip period of each other, a rake receiver may be used to adjust and combine.
Apr 1, 2012 · An advanced RAKE structure is the generalized RAKE (G-RAKE) receiver [6, [8][9][10]. In contrast to conventional RAKE reception, the G-RAKE comprises extra fingers to collect information about ...
Multipath still exists in such an environment, and an FPGA-based RAKE receiver is necessary to increase the reliability of this wireless system. The system architecture of such a receiver would be the same as the one described in this paper. A typical example of an air-interface wireless standard is the IS-95 standard protocol for CDMA mobile ...
Summary of a Rake Receiver First implementation: 1950s. RAKE receiver is a matched –lter receiver for wide-band signals. It is used to resolve paths delayed by more than T c. Main assumption: the channel is time invariant over the decision interval [0,T cs]. Rake-Receiver = optimum Single-user Receiver it has a number of ‚–ngers™ (One ...
Apr 28, 2017 · The design of highly efficient receivers with a good balance in both performance and ramification is a major challenge. WCDMA Systems are reducing their ramification by using Rake Receivers. 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 ...
A Rake receiver is a radio receiver designed to counter the effects of multipath fading in wireless communications. It does this by using several “sub-receivers” each delayed slightly in order to tune in to the individual multipath components. Rake receiver preceding a maximal ratio combining becomes an optimum receiver in the sense of highest signal-to-noise ratio. A Rake receiver is part of the standard defined by 3GPP for WCDMA mobile systems. Multiple Input Multiple Output technology ...
