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Topic: Pseudonoise

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Pseudorandom number generator

	Regenerative Pseudonoise Ranging
		Pseudonoise binary sequences have been used before in turnaround ranging of spacecraft because they offer a desirable combination of high ranging resolution, low ranging ambiguity, and no need for receivers to "know" when pseudonoise sequences started.
		If the pseudonoise sequence could be regenerated in the transponder with proper timing instead of being simply turned around along with the uplink noise, then it could be retransmitted without the uplink noise, thereby increasing the ranging-signal-to-noise ratio.
		The nature of the pseudonoise sequence would be such that the tracking phase error would average out to zero in the long term, and the effect of the tracking phase error could be diminished through low-pass filtering.
	www.nasatech.com /Briefs/June01/NPO20846.html (784 words)

	Coherent spread spectrum pseudonoise tracking loop - Patent 4538280
		pseudonoise signal generator means for generating a pseudonoise sequence signal which corresponds to a pseudonoise signal component of the received spread data signal.
		A demodulator is included in the first channel for correlating the pseudonoise signal component of the received spread spectrum signal with the pseudonoise sequence signal generated by the local generator to thereby generate a detected recovered signal.
		The control signal is applied to the local generator for controlling the phase of the pseudonoise signal sequence to lock the phase of the pseudonoise sequence signal to the phase of the pseudonoise signal component of the received spread spectrum signal.
	www.freepatentsonline.com /4538280.html (5958 words)

	User terminal parallel searcher - US Patent 6765953 (Site not responding. Last check: 2007-10-24)
		Each slice includes a delay unit for delaying the pseudonoise sequence by a predetermined chip time, a despreader for operating on a data stream as a function of a previously delayed pseudonoise sequence, and at least one coherent accumulator for coherently accumulating an output of the despreader.
		More specifically, the present invention identifies the pseudonoise sequence (also referred to as a "PN code") and particular timing offset of the PN code that was used to spread the signal prior to its transmission, along with the pilot orthogonal channel code, Walsh sequence, assignment, and a course estimate of the Doppler frequency offset.
		In step 802, the pseudonoise sequence produced by PN code generator 312 is delayed by a preselected amount by delay units 506 to produce a plurality of delayed pseudonoise sequences.
	www.patentstorm.us /patents/6765953.html (9231 words)

	Antenna, November 1997 (Site not responding. Last check: 2007-10-24)
		"Pseudonoise," for instance, served quite well in describing this manipulation of signals because, to a receiver not synchronized with the transmitter, incoming signals came through as meaningless noise.
		The essential feature of spread-spectrum technology is the expansion, or spread, of the bandwidth of the transmitted signal (carrier wave plus data stream) well beyond that at which it incorporates the data stream to be communicated.
		The phase of the carrier signal, which has a constant frequency, is switched (say, by 180 degrees) at irregular intervals according to a long pseudonoise (PN) pattern before it is modulated by the data stream.
	www.mercurians.org /nov97/spectrum-capsule.html (488 words)

	Pseudonoise code tracking loop - Patent 4221005
		A pseudonoise code is generated in the form of a multiple bit reference code in response to an error signal.
		2 is a schematic electrical circuit diagram of a pseudonoise tracking loop according to the present invention.
		For example, for a shift register having n stages, where n is a number greater than 2, connection could be made for the late reference code to a stage n-y, where y is an integer 2 or larger but less than n.
	www.freepatentsonline.com /4221005.html (2246 words)

	shift2mask (Communications Toolbox) (Site not responding. Last check: 2007-10-24)
		Linear feedback shift registers are part of an implementation of a pseudonoise sequence generator.
		Below is a schematic diagram of a pseudonoise sequence generator.
		If you have the Communications Blockset and want to generate a pseudonoise sequence in a Simulink model, see the reference page for the PN Sequence Generator block in the blockset's documentation set.
	www.eas.purdue.edu /matlab/toolbox/comm/shift2mask.html (311 words)

	NASA Tech Briefs: Heterodyne doppler lidar using pseudonoise code
		The heart of the transmitter in the present developmental instrument is a diode laser, which is chosen for compactness and because the electrical efficiencies of diode lasers are generally greater than those of gas and solid-state lasers.
		On the other hand, diode lasers are not suitable for pulsed operation at the peak power levels and pulse-repetition frequencies needed for range gating in the intended application; therefore, in the present instrument, range gating is achieved by use of a pseudonoise code.
		The transmitting diode laser will be modulated with the pseudonoise code a prescribed pseudorandom sequence of "on" and "off' states - with each "on" or "off' state lasting 1 to 2 ps.
	www.findarticles.com /p/articles/mi_qa3957/is_200008/ai_n8905419 (581 words)

	[No title] (Site not responding. Last check: 2007-10-24)
		pseudonoise sequence, each block being multiplied by a bit of a data sequence, the pseudonoise sequences and the data sequences being uniquely associated with respective satellites, all the pseudonoise sequences being of equal length, the pseudonoise sequences being mutually orthogonal, the method comprising the steps
		A receiver for receiving a signal transmitted by a beacon, the signal including a plurality of frames of a pseudonoise sequence, comprising : (a) an antenna for receiving the transmitted signal ; (b) a mechanism for digitizing the received signal to produce a digitized signal including a plurality of bits ;
		that correspond to an integral number of frames of said respective pseudonoise sequence, and to perform a discrete orthogonal transform on each of said rows of said matrix.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/53848.010726&ELEMENT_SET=DECL (8170 words)

	DSA: A Distributed Sample-Based Fast DS/CDMA Acquisition Technique
		The proposed scheme lays its foundations on an auxiliary PN sequence called the igniter sequence, which has relatively short period, and the distributed sample scrambling (DSS) technique recently developed for the asynchronous transfer mode cell transmission.
		R. Ward, "Acquisition of pseudonoise signals by sequential estimation," IEEE Trans.
		R. Ward and K. Yiu, "Acquisition of pseudonoise signals by recursion aided sequential estimation," IEEE Trans.
	www.comsoc.org /comm/private/1999/may/754_47comm05-kim.html (610 words)

	Abstract
		After a review of the properties of pseudonoise sequences and what constitutes a pseudonoise sequence, a number of different sequences with pseudonoise and pseudonoise-like properties are described.
		Pseudonoise sequences can be used to encode message data such that the resultant information can be `spread very thinly' over the cover image.
		Pseudonoise sequences are useful for this purpose because a carrier signal with an embedded sequence can be designed to interact minimally with harmonics of the carrier.
	goanna.cs.rmit.edu.au /~ronvs/papers/PhD (584 words)

	PseudoNoise actor (Site not responding. Last check: 2007-10-24)
		The PseudoNoise suite implements a basic colored noise synthesis algorithm, along with its associated handler and actor.
		Various amounts of filtered, non-repetitive "random" noise can be introduced to modulate or "break up" the repetitiveness of the resulting sound.
		PseudoNoise uses three parameters: "Cutoff", "Modulation Cutoff", and "Modulation Index".
	www.isl.uiuc.edu /VSS/vss_reference/actorDocs/pnoise.html (381 words)

	[No title] (Site not responding. Last check: 2007-10-24)
		A historical perspective on the construction methods, analysis techniques and application of pseudonoise sequences will be presented.
		Matrices with pseudonoise properties are useful in a new and growing area called watermarking of digital images.
		The construction of matrices from pseudonoise sequences has been an ongoing area of interest in the Department of Mathematics since 1996.
	www.maths.monash.edu.au /research/seminars/colloquium/260401.html (134 words)

	Deep-Space Ranging Using Pseudonoise Codes
		The phase shift for which the correlation is maximum is deemed to be related to the round-trip signal-propagation time and, hence, to the distance.
		The modulations used in prior such systems were sequential square-wave tones or repeating pseudonoise tones, but not both in the same system.
		It is shown that in comparison with the existing system using sequential square-wave tones, a system using a set of pseudonoise codes would perform better (in terms of integration time and variance in distance) and could be configured and operated more easily.
	www.nasatech.com /Briefs/July02/NPO30387.html (190 words)

	[No title] (Site not responding. Last check: 2007-10-24)
		It allows the positioning of multiple signals over the same frequency range, and provided one has the correct Pseudonoise (PN) key, one can extract that signal again.
		This technique is used to hide signals in the ambient noise, and to bypass any active radar jamming.
		S(w) W One implementation of DS-SS is to multiply the signal by both a Binary-Phase-Shift-Keying carrier, followed by a Pseudonoise sequence, c(t) consisting of 1's and -1's in series.
	www.eng.uct.ac.za /~eee482f/CLASS_TUTS/prob_10.5/lwxmar010_summary.doc (458 words)

	(WO 00/04652) METHOD FOR SYNCHRONOUS CODE DIVISION MULTIPLEXED COMMUNICATIONS (Site not responding. Last check: 2007-10-24)
		1), which includes a pseudonoise code generator (70), is synchronized with the pseudonoise code generator (220) of a communications node (200).
		Synchronization between the pseudonoise code generators (70, 220) is achieved through measuring the time delay of a signal transmitted from the communications node (200) to the subscriber unit (260) and advancing the code generator of the subscriber unit in accordance with the time delay.
		The synchronization is maintained through the periodic transmission from the communications node (200) to the subscriber unit (260) of a message which commands the subscriber unit (260) to adjust the timing of its pseudonoise code generator.
	www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=00/04652.000127 (244 words)

	Tommy Royster (Site not responding. Last check: 2007-10-24)
		When the signal's sequence and the receiver's sequence are synchronized, a high correlation peak occurs in the receiver's matched filter.
		For a pseudonoise sequence, the highest value of this function occurs when there is no shift.
		Generally, the values at other shifts (known as sidelobes) are much lower than the highest value, but some sequences have sidelobes that are closer in magnitude to the highest peak.
	www.clemson.edu /sure/2001/troyste/abstract.htm (365 words)

	PN Sequence Generator (Reference) (Site not responding. Last check: 2007-10-24)
		The PN Sequence Generator block generates a sequence of pseudorandom binary numbers.
		A pseudonoise sequence can be used in a pseudorandom scrambler and descrambler.
		It can also be used in a direct-sequence spread-spectrum system.
	www.phys.ufl.edu /docs/matlab/toolbox/commblks/ref/pnsequencegenerator.html (338 words)

	FAQ - Answer (Site not responding. Last check: 2007-10-24)
		It is impossible to measure the noise in the nearest zone of the source (pseudonoise and pseudovibration) that gives the main volume of information about the incipient defects.
		Here the pseudonoise and pseudoviabrartion means the noise and vibration components that can be identified just near the source, when the distance is less than the quarter of the vibroacoustical wave, but on larger distances they are absent because of the mutual compensation of oscillations generated in different points of the source.
		However, the mentioned causes do not limit the possibilities of using the directional microphones in monitoring systems that are not intended to detect all the main defects on their incipient stage of development.
	www.vibrotek.com /club/a2-5e.htm (279 words)

	CDMA & Spread Spectrum Technology - Tools & Resources
		M-sequences, also known as pseudonoise (PN) sequences and pseudorandom bit sequences (PRBS), have favorable noise-like properties that make them particularly useful in spread spectrum applications.
		PN sequences are distinguishable from truly random sequences in that they inherently or deliberately exhibit periodicity (i.e.
		In the strict sense, pseudonoise sequence and pseudorandom sequence are synonymous with
	www.newwaveinstruments.com /resources/glossary.htm (3483 words)

	Partial-Length Correlation Theory for Spread Spectrum Ultrasonic Evaluation Application by Sangmin Bae, Volume 13A (Site not responding. Last check: 2007-10-24)
		The crosscorrelation processing of these long codes requires a considerable portion of the computer resources of the test system.
		By making the correlation length adaptive, sidelobe-to-signal ratio increases can be traded for processing speed.
		This paper describes the theory of partial-length correlation for the maximal-length pseudonoise sequences used in DSSS ultrasonics.
	www.cnde.iastate.edu /QNDEDatabase/Vol.13A/p0825-0832.html (142 words)

	EDN Access -- 12.22.94 Pseudonoise generator doubles its speed (Site not responding. Last check: 2007-10-24)
		EDN Access -- 12.22.94 Pseudonoise generator doubles its speed
		You can double the speed of a standard pseudonoise (PN) generator by using additional exclusive-OR gates and a fast 2:1 multiplexer.
		A PN generator built with an n-stage feedback shift register gives a maximal-length sequence of 2
	www.edn.com /archives/1994/122294/26di1.htm (268 words)

	Range Image Acquisition with a Single Binary-Encoded Light Pattern
		Every sample point indicated by the light pattern is made identifiable by means of a binary signature, which is locally shared among its closest neighbors.
		The applied code is derived from pseudonoise sequences, and it is optimized so that it can make the identification fault-tolerant to the largest extent.
		A prototype measurement system based on this coding principle is presented.
	csdl2.computer.org /persagen/DLAbsToc.jsp?resourcePath=/dl/trans/tp/&toc=comp/trans/tp/1990/02/i2toc.xml&DOI=10.1109/34.44402 (681 words)

	Working Dogs Book Store - Search-free acquisition of pseudonoise codes: Semi-annual progress report (Communication and ...
		Working Dogs Book Store - Search-free acquisition of pseudonoise codes: Semi-annual progress report (Communication and signal processing research) (Kurt L Kosbar)
		Search-free acquisition of pseudonoise codes: Semi-annual progress report (Communication and signal processing research) (Kurt L Kosbar)
		Search-free acquisition of pseudonoise codes: Semi-annual progress report (Communication and signal processing research)
	www.workingdogs.com /bookstore/us/product/B0006RM226.htm (95 words)

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