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Topic: Rake receiver

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	Rake receiver - Patent 6026115 (Site not responding. Last check: 2007-09-17)
		The RAKE receiver as claimed in claim 1, further comprising a switch for connecting outputs of said despreaders to desired ones of said pre-detection combiners, and for connecting the outputs of said despreaders to inputs of said detectors, wherein said path searcher controls a connection state of said switch.
		The RAKE receiver as claimed in claim 1, wherein said pre-detection combiners combine a plurality of paths whose average signal levels are smaller than a particular threshold value, and said post-detection combiner combines paths whose average signal levels are greater than the threshold level.
		Here, the RAKE receiver may further comprise a switch for connecting outputs of the despreaders to desired ones of the pre-detection combiners, and for connecting the outputs of the despreaders to inputs of the detectors, wherein the path searcher controls a connection state of the switch.
	www.freepatentsonline.com /6026115.html (3287 words)

	Rake (disambiguation) - Wikipedia, the free encyclopedia
		A rake, a stock character in a play or movie, a man of high society with loose morals
		Raking fire is fire along the axis of a ship in naval warfare
		The Rake's Progress is an English opera by Igor Stravinsky based on a series of illustrations by William Hogarth
	en.wikipedia.org /wiki/Raking (122 words)

	Quantized coherent rake receiver - Patent 5305349 (Site not responding. Last check: 2007-09-17)
		For simplicity, the typical RAKE receiver assumes that the time delays between the rays are a constant, i.e., T.sub.1 =T.sub.0 +dT, T.sub.2 =T.sub.0 +2dT, and T.sub.3 =T.sub.0 +3dT for the profile shown; the time delays (and amplitudes) are usually estimated from the received composite signal's history.
		In one form of RAKE receiver, correlation values of the signature sequence with the received signals at different time delays are passed through a delay line that is tapped at the expected time delay (dt), i.e., the expected time between receiving echoes.
		A received radio signal is demodulated by, for example, mixing it with cosine and sine waveforms and filtering the signal in an RF receiver 1, yielding I and Q chip samples.
	www.freepatentsonline.com /5305349.html (10733 words)

	Rake receiver - Wikipedia, the free encyclopedia
		A rake receiver is a radio receiver designed to counter the effects of multipath fading.
		This could very well result in higher SNR (or EbNo) in a multipath environment than in a "clean" environment.
		The Rake reciever is so named because of it's analogous function to a garden rake, each branch collecting bit or symbol energy similarly to how tines on a rake collect leaves.
	en.wikipedia.org /wiki/Rake_receiver (156 words)

	CDMA - Online
		Each correlator in a RAKE receiver is called a RAKE-receiver finger.
		The word "RAKE" is not an acronym and, in fact, is not always capitalized as it is in this writing.
		When a wideband signal is received over a multipath channel, the multiple delays appear at the receiver as depicted in the figure below.
	www.cdmaonline.com /interactive/workshops/terms1/1035.htm (248 words)

	Encyclopedia: Rake receiver
		The word receiver has a number of different meanings: In communications and information processing, a receiver is the recipient (observer) of a message (information), which is sent from a source (object).
		In telecommunication, multipath is the propagation phenomenon that results in radio signals reaching the receiving antenna by two or more paths.
		Rake receivers are common in a wide variety of radio devices, including mobile phones and wireless LAN equipment.
	www.nationmaster.com /encyclopedia/Rake-receiver (324 words)

	How the rake receiver works (Site not responding. Last check: 2007-09-17)
		The rake receiver identifies the three strongest multi-path signals and combines them to produce one very strong signal.
		The rake receiver therefore uses multipath to reduce the power the transmitter must send.
		Both the mobile and the BTS use rake receivers.
	www.qualcomm.com /ProdTech/cdma/training/cdma25/m6/m6p15.html (49 words)

	Rake receiver with time-shared fingers patent invention
		A rake receiver takes data from a digital radio front-end after conversion down to a baseband sample rate and despreads the signal down to the symbol rate.
		As shown, rake receiver 100 has four identical fingers 101-0 to 101-3, each of which collects energy for a particular multi-path component of the received signal and then compensates for the delay of that multi-path component.
		In the chip period assigned to a particular finger/path, multiple received bits (equal to the number of fingers sharing the same hardware) for that finger are demodulated to "catch up" with those "missing" chip periods that were assigned to demodulate other fingers/paths.
	www.freshpatents.com /Rake-receiver-with-time-shared-fingers-dt20061109ptan20060251155.php (2175 words)

	Wireless Design & Development
		One of the more demanding functions on the baseband module in a radio basestation is the receiver and, in particular, the de-spreading of a signal after it has been subjected to a multipath channel.
		To relate this to the implementation, it is assumed that an average of four rake fingers are needed to support one channel, and each user accounts for one control channel and one data channel each.
		Two rake engines in parallel process the data, and their inputs are shared at the top of the design that was simulated.
	www.wirelessdesignmag.com /ShowPR.aspx?PUBCODE=055&ACCT=0031595&ISSUE=0509&RELTYPE=PR&ORIGRELTYPE=CVS&PRODCODE=00000&PRODLETT=C (3976 words)

	CEWIT.ORG - Center of Execellence in Wireless and Information Technology (Site not responding. Last check: 2007-09-17)
		Peterson received a B.S. from Stony Brook University.
		Rake 1, Rake 2, Rake 3, and Rake 4 denote the case of Lp=1, Lp=2, Lp=3, and Lp=4, respectively.
		In the case of Rake 4, the BER performance of DSCDMA UWB system using STBC for L=8 is similar to that of ARake receiver shown in Fig 3.
	www.cewit.org /2004Program.asp (19922 words)

	CommsDesign - W-CDMA RAKE Receiver Comes to Life in DSP
		In a RAKE receiver, one RAKE finger is assigned to each multipath, thus maximizing the amount of received signal energy.
		At the receiver end, the received data is first passed through a matched filter (matched to the transmitter filter).
		Then the received signal is delayed by the amount estimated by the path searcher and multiplied by the conjugate of scrambling and spreading code (code that was used for transmission).
	www.commsdesign.com /design_corner/OEG20031119S0011 (3467 words)

	CDG : Technology : Welcome to the World of CDMA
		A CDMA correlation receiver forms a temporal window such that signals arriving within the window are accepted and signals arriving outside the window are rejected.
		As discussed above, a Rake receiver is necessary in order to capture a significant fraction of the received signal power of a spread spectrum signal in a multipath environment.
		Rake receiver suitable for use in a base station receiver.
	www.cdg.org /technology/cdma_technology/a_ross/OptBW.asp (2846 words)

	infos about cdma rake receiver block diagram
		A rake receiver is a radio receiver designed to counter the effects of multipath...
		Rake receivers are common in a wide variety of CDMA and W-CDMA radio devices such as mobile phones and wireless LAN...
		The rake receiver is a CDMA feature that turns what is a problem in other technologies into an advantage for CDMA.
	www.suche-einen-partner.de /8f57247dbee12d3f7af29312927725dd.php (246 words)

	App Note Abstract: Implementation of a WCDMA Rake Receiver on a TMS320C62x DSP Device
		Implementation of a WCDMA Rake Receiver on a TMS320C62x DSP Device
		The search is performed at a level of power where a DSP-based rake receiver can be implemented and reception can be improved.
		This 100-MHz engine searches for paths and receives data using a 6-finger rake receiver at 58 MHz, thereby implementing a complete rake receiver on a single TMS320C62x(tm) DSP device.
	www.ti.com /sc/docs/psheets/abstract/apps/spra680.htm (136 words)

	rake on Encyclopedia.com
		Of the several types of modern power-drawn hay rakes, the side-delivery rakes, which gather hay into continuous windrows by a rolling action, are the most popular.
		Lesser used rakes include the dump rake, which creates piles, and the sweep rake, which gathers and hauls a heavy load directly to the stack.
		Drew Kimmell, a member of the Missouri Northern Pecan Growers of Nevada, Missouri, rakes a load of Vernon County pecans into a pit where a conveyor belt begins the sorting process in November 2003.
	www.encyclopedia.com /html/r1/rake.asp (758 words)

	米国特許公開公報 20020012384 - Rake receiver for a CDMA system, in particular incorporated in a cellular mobile ... (Site not responding. Last check: 2007-09-17)
		Rake receiver for a CDMA system, in particular incorporated in a cellular mobile phone
		A rake receiver uses a delayed version of the received sequence and a delayed version of a scrambling code.
		By controlling two multiplexers, the delayed versions of the received sequence can be multiplied with an arbitrary scrambling code having an arbitrary phase.
	cxp.paterra.com /jp/uspregrant20020012384.html (140 words)

	Motorola CPCI-C6800 FAQ - Embedded Communications Computing
		I am implementing a semi-soft receiver where an ASIC implements the rake receiver and partially despreads the signal.
		This is then passed back to the DSP for identifying the spreading code and completion of the despreading process.
		This is essentially symbol rate data which is spread by the ASIC and requires a relatively low data rate.
	www.motorola.com /content/0,,5586,00.html (630 words)

	Communications and Signal Processing (Site not responding. Last check: 2007-09-17)
		A RAKE receiver captures the different time arrivals separately by exploiting the correlation properties of the spreading code.
		A RAKE receiver usually employs a number of fingers to cover the delay spread of the channel.
		Therefore, the performance of the RAKE receiver might be improved if a structured low order estimate of the FIR channel is identified, taking into account that there may be only a few significant propagation paths, (i.e., there is only a few non-zero filter taps).
	www.csp.curtin.edu.au /projects/rake.html (378 words)

	Ali Shankiti (Site not responding. Last check: 2007-09-17)
		RAKE receivers are widely used in the wireless communications industry.
		We demonstrate the feasibility of using FPGAs to implement a RAKE receiver.
		I am implementing a RAKE receiver on a Wildforce FPGA board from Annapolis Microsystems.
	www.cdsp.neu.edu /theses/ali_new.htm (345 words)

	MPRG - Research Thrust Areas
		Because of the distortion caused by the channel, it is inefficient to use a simple matched filter receiver where the template is matched to the transmit pulse (including the effect of the transmit and receive antennas).
		However, these two works make the assumption that the Rake receiver is able to completely resolve the L strongest channel paths.
		A theoretical expression for the Rake receiver using MRC combining was developed in MPRG, both for biphase and PPM modulation.
	www.mprg.org /research/UWB/uwb_receiver.html (1367 words)

	Smart Antenna Based Interference-Blocking Rake Receiver (ResearchIndex) (Site not responding. Last check: 2007-09-17)
		Abstract: In this paper, a space-time RAKE (ST-RAKE) receiver with enhanced interference rejection is proposed for CDMA communications systems over a multipath fading channel.
		An interference-blocking (IB) transformation is first developed based on the received data (undespread data) for suppressing the strong interference.
		0.8: Reconfigurable Adaptive RAKE Receiver for Wideband CDMA..
	citeseer.ist.psu.edu /551860.html (242 words)

	BERG Publications
		We propose a modified RAKE receiver that finds an optimal balance between the goal of gathering multipath signal energy, avoiding ISI, and suppressing narrowband interference.
		For fixed RAKE finger delays, we develop a closed-form expression for the minimum mean squared error (MMSE) combining weights that account for ISI.
		We then examine the optimal choice of RAKE finger delays, and show that significant performance gains can be achieved, particularly in an undermodeled situation when there are more channel paths than RAKE fingers.
	bard.ece.cornell.edu /publications/abstract/spawc03_rake.html (179 words)

	Rake Receiver Reference Design
		A rake receiver is a fundamental building block in many Code Division Multiple Access (CDMA) systems.
		A rake receiver takes data from the digital radio front-end after conversion down to base band sample rate, which is typically 2 times the data (chip) rate, and de-spreads the signal to symbol rate.
		As the signal from the user can take multiple paths to the base station, the receiver has a number of fingers each of which operate such that the resulting output can be combined to form one signal at symbol rate.
	www.latticesemi.com /products/intellectualproperty/referencedesigns/rakereceiverreferencedesi.cfm (896 words)

	WINLAB Abstract Server (Site not responding. Last check: 2007-09-17)
		The RAKE receiver is used in the multipath channels to make use of theinherent time-diversity effect achieved by the use of a direct sequence spread spectrum (DSSS) communication system.
		The simulation results show that the RAKE receiver with tap weights being adjusted by POCS estimates performs close to an ideal RAKE for a sounding signal transmitted at Signal to Noise Ratio (SNR) of greater than 25 dB.
		a simple implementation of RAKE receiver in an indoor multipath environment, having large number of taps and small number of useful paths is not feasible.
	www.winlab.rutgers.edu /bin/getabs.pl?WINLAB_Publication+P0027.txt (327 words)

	CiteULike: Robust noncoherent receiver exploiting UWB channel properties (Site not responding. Last check: 2007-09-17)
		Most UWB radio receivers discussed in the literature are coherent receivers, which can offer high signal sensitivity and support high data rates but require precise timing clock recovery and complex RAKE structures.
		Although the proposed receiver works without channel state information and complex RAKE frontend, its performance compares favorably with that of a coherent 2PAM RAKE receiver of low order.
		The simple noncoherent receiver exploits most of the multipath diversity offered by the channel and is robust to clock timing errors.
	www.citeulike.org /user/rmerz/article/1001999 (438 words)

	Articles - IS-95 (Site not responding. Last check: 2007-09-17)
		Every BTS is synchronized with a GPS receiver so transmissions are tightly controlled in time.
		The mobile receiving a variable-rate traffic frame does not know the rate at which the frame was transmitted.
		The receiver also uses the techniques of the Rake receiver to improve SNR as well as perform Soft handoff.
	www.kamero.net /articles/IS-95 (1673 words)

	Rake receiver for spread spectrum signal demodulation (US6430216)
		The architecture of the present invention is premised upon an algorithm involving integration of oblique correlators and RAKE filtering to null interference from other spread spectrum signals.
		The oblique correlator is, of course, based on the non-orthogonal projections that are optimum for nulling structured signals such as spread spectrum signals.
		RAKE filtering is used to rapidly steer the beam of the multi-antenna system and to mitigate the effects of multipath.
	www.delphion.com /details?pn=US06430216__ (807 words)

	The Rake Receiver (Cont
		by the fading channel and combines the received signals of different paths with equal weight.
		The receiver corrects the phase rotation caused by a fading channel and then combines the
		received signals of different paths proportionally to the strength of each path.
	www2.rad.com /networks/2003/wcdma/rake.htm (152 words)

	vB Easy Archive - Rake receiver in LG phones - how many fingers?
		Only if the phone is capable of demodulating the pilots, which is a direct function of the number of fingers in the rake receiver.
		IS-95 uses a RAKE receiver with 4 fingers...
		Therefore, at any point in time, we'll see some cel phones using the existing cellular network infrastructure(s) with 4 rakes, some models with more rakes, etc. This is the case among currently marketed models of LG phones, for example.
	www.howardforums.com /archive/topic/267917-1.html (1693 words)

	Biased-corrected rake receiver for direct sequence spread spectrum waveform - US Patent 6614836 (Site not responding. Last check: 2007-09-17)
		The performance of a RAKE receiver for indoor multipath WLAN applications on direct sequence spread spectrum signals having relatively short codeword lengths comprises a channel-matched filter and codeword correlator front end, plus a signal combiner to which the codeword correlation component is applied.
		The signal combiner is supplied with a bias-corrected input calculated by a distorted codeword signature (power) generator, which is operative to generate and store a set of N codeword power correction values.
		The output of the signal combiner is coupled to a peak detector, which selects a minimum distance-based `de-biased` output as the transmitted codeword.
	www.patentstorm.us /patents/6614836.html (223 words)

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