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Topic: AWGN

	AWGN Channel :: Blocks (Communications Blockset)
		The AWGN Channel block adds white Gaussian noise to a real or complex input signal.
		If the variance is a vector whose length is the number of channels in the input signal, then each element represents the variance of the corresponding signal channel.
		The variance of each of the quadrature components of the complex noise is half of the calculated or specified value.
	www.mathworks.com /access/helpdesk/help/toolbox/commblks/ref/awgnchannel.html (0 words)

	AWGN - The real meaning from Timesharetalk wikipedia
		In communications, the additive white Gaussian noise (AWGN) channel model is one in which the only impairment is the linear addition of wideband or white noise with a constant spectral density (expressed as watts per hertz of bandwidth) and a Gaussian distribution of amplitude.
		It is not a good model for most terrestrial links because of multipath, terrain blocking, interference, etc. However for terrestrial path modeling, AWGN is commonly used to simulate background noise of the channel under study, in addition to multipath, terrain blocking, interference, ground clutter and self interference that modern radio systems encounter in terrestrial operation.
		In serial data communications, the AWGN mathematical model is used to model the timing error caused by random jitter (RJ).
	www.timesharetalk.co.uk /wiki.asp?k=AWGN (283 words)

	CommsDesign - Symbol error math decoded
		They may be different for an acceptable frame recovery for a layer two function in a switch or router, or perhaps just to an adjacent decoder whose job is to correct a reasonable number of transmitted symbols by implementing sophisticated error correction.
		AWGN is the fundamental thermal noise associated with real channels.
		Another way of saying this is that the variance of AWGN is the power of the noise.
	www.commsdesign.com /showArticle.jhtml?articleID=192500090 (1433 words)

	MP Digest (Site not responding. Last check: 2007-10-29)
		AWGN can be generated by several sources, but avalanche diodes are the most common source used in electronic system testing.
		When AWGN is injected into the input of a receiver, it can quickly evaluate receiver performance and other parameters.
		AWGN can be used to simulate a complicated modulation signal, to purposely corrupt an existing signal, as a reference signal in other applications, and as economical source of broadband power.
	www.mpdigest.com /Articles/2006/mar2006/opinion/Default.htm (0 words)

	Additive white Gaussian noise - Wikipedia, the free encyclopedia
		Wideband Gaussian noise comes from many natural sources, such as the thermal vibrations of atoms in antennas (referred to as thermal noise or Johnson-Nyquist noise), shot noise, fl body radiation from the earth and other warm objects, and from celestial sources such as the sun.
		It is not a good model for most terrestrial links because of multipath, terrain blocking, interference, etc. However for terrestrial path modeling, AWGN is commonly used to simulate background noise of the channel under study, in addition to multipath, terrain blocking, interference, ground clutter and self interference that modern radio systems encounter in terrestrial operation.
		In serial data communications, the AWGN mathematical model is used to model the timing error caused by random jitter (RJ).
	en.wikipedia.org /wiki/Additive_white_Gaussian_noise (270 words)

	AWGN \| \| Dictionary & Translation by Babylon
		AWGN in 13 languages, encyclopedia term for AWGN.
		In communications, the additive white Gaussian noise (AWGN) channel model is one in which the only impairment is the linear addition of wideband or white noise with a constant spectral density (expressed as watts per hertz of bandwidth) and a Gaussian distribution of amplitude.
		AWGN to English AWGN to German AWGN to Turkish
	www.babylon.com /definition/AWGN/All (0 words)

	AWGN Channel (Communications Blockset) (Site not responding. Last check: 2007-10-29)
		The AWGN Channel block adds white Gaussian noise to a real or complex input signal.
		If the variance is a vector whose length is the number of channels in the input signal, then each element represents the variance of the corresponding signal channel.
		The variance of each of the quadrature components of the complex noise is half of the calculated or specified value.
	attila.sdsu.edu /matlab/toolbox/commblks/ref/awgnchannel.html (0 words)

	Demonstration
		It is important to mention that these various noise power values were sent from the supervisor to the AWGN module via the system task demonstrating the aspect of re-configurability.
		It is in fact due to the fact that the noise realization used for the Rayleigh case differs from the one used for the AWGN case.
		In the case of 2-path Rayleigh fading with AWGN, the performance are plotted above the performance of the AWGN case presented in the previous figure.
	www.csem.ch /slats/demonstration.html (565 words)

	AWGN Channel Model
		The Figures bellow illustrate the effect of the AWGN channel on PSK signalling.
		The distribution of the received symbols is gaussian centered at the expected symbol.
		The effect of increasing the number of symbols in the PSK constellation is also evident here: with more symbols, the decoding thresholds shrink, and the same effect of additive noise generates more errors in higher-order PSK signalling.
	portfolio.washington.edu /toliy/constellations/107150.html (159 words)

	MAX2392 Meets TD-SCDMA UE Phase Noise Requirements - Maxim/Dallas
		Recognizing that the only contributing factors for the UE are system AWGN and Tx/Rx phase noise, a statistical analysis based on superposition of these two factors is provided to set a limit on UE transceiver phase noise.
		As we know, both the AWGN and LO phase noise are random processes, and they are not correlative.
		Here we assume that the estimate error is equal to the error of transmitted signal's frequency, and AWGN is a random process, the estimate error also follows a Gaussian distribution.
	www.maxim-ic.com /appnotes.cfm?an_pk=3036 (994 words)

	Cell Power and AWGN Power
		In the lab application, the total RF power consists of Cell 1 power, Cell 2 power and the AWGN power if their states are on.
		For the lab application, an external AWGN value is displayed when the test set is configured to generate faded forward channel signals with AWGN enabled.
		AWGN power must not be more than 10 dB above or 20 dB below cell power when both power states are set to ON.
	wireless.agilent.com /rfcomms/refdocs/wcdma/wcdma_gen_bse_dl_pwr_lvls.php (0 words)

	ECS EPrints Service - Space-Time IQ-interleaved TCM and TTCM for AWGN and Rayleigh Fading Channels (Site not responding. Last check: 2007-10-29)
		Space-Time IQ-interleaved TCM and TTCM for AWGN and Rayleigh Fading Channels
		Ng, S. and Hanzo, L. Space-Time IQ-interleaved TCM and TTCM for AWGN and Rayleigh Fading Channels.
		EPrints is free software developed by the University of Southampton to facilitate Open Access to research.
	eprints.ecs.soton.ac.uk /8273 (0 words)

	A Tutorial on Convolutional Coding with Viterbi Decoding
		Convolutional encoding with Viterbi decoding is a FEC technique that is particularly suited to a channel in which the transmitted signal is corrupted mainly by additive white gaussian noise (AWGN).
		You can think of AWGN as noise whose voltage distribution over time has characteristics that can be described using a Gaussian, or normal, statistical distribution, i.e.
		Many radio channels are AWGN channels, but many, particularly terrestrial radio channels also have other impairments, such as multipath, selective fading, interference, and atmospheric (lightning) noise.
	home.netcom.com /~chip.f/viterbi/tutorial.html (2090 words)

	AWGN Channel (Communications Blockset) (Site not responding. Last check: 2007-10-29)
		An AWGN channel adds white Gaussian noise to the signal that passes through it.
		The AWGN Channel block can process either sample-based or frame-based data, and it lets you specify the variance of the noise in one of four ways:
		An example using the AWGN Channel block is in Getting Started with the Communications Blockset.
	www.ece.umr.edu /computing/unix/software/matlab/toolbox/commblks/tutor3-2.html (0 words)

	[No title] (Site not responding. Last check: 2007-10-29)
		These results are instrumental in predicting the performance of systems which operate in the presence of multiple narrow-band interference, comparing the relative merits of alternative algorithms for arbitrary interference spectrum, and determining hardware requirements necessary to support a given level of system performance.
		ANALYSIS OF EXCISION WITH WINDOWING AND OVERLAPPING IN AWGN AND TONES The analytical technique proposed in chapters 2 and 3 allows the performance of spectrum mapping algorithms to be compared when applied in conjunction with widely known properties of windows [33].
		This chapter expands the scope of the analytical technique to derive performance for a general class of windows, and proposes a linearized model of excision that allows the loss for the overlap-and-add architecture to be derived.
	cobweb.ecn.purdue.edu /~andy/THESIS2003.DOC (0 words)

	Print Version-Software adds AWGN simulation to mobile carrier-noise test (Site not responding. Last check: 2007-10-29)
		Letting you test mobile handsets for real-world noise conditions, test equipment maker Aeroflex is now including an AWGN (additive white Gaussian noise) source to its existing IQCreator software.
		The addition of the AWGN feature transforms two of the company's RF signal generator into noise generators.
		A precise and repeatable in-channel AWGN is important when determining a mobile receiver's sensitivity threshold.
	www.eetasia.com /ARTP_8800375343_480100.HTM (312 words)

	EETimes.com - Confidence in Waterfall Curves guides noise analysis in wireless system test
		For that reason, wireless systems typically require an evaluation of BER in response to varying levels of simulated background noise, where the noise is expressed in terms of Eb/No, or bit signal-to-noise ratio.
		The AWGN will cause bit errors on the data stream that can mathematically be represented as a Gaussian probability distribution.
		Applying AWGN to wireless devices will lead to test results that are normally represented as BER vs. Eb/No curves, commonly referred to as waterfall curves.
	www.eetimes.com /story/OEG20030710S0042 (1547 words)

	Content
		Additive White Gaussian Noise (AWGN): the marginal distribution of AWGN process is Gaussian with zero mean; the auto-correlation is a delta function; the power spectral density is a constant over the range of frequency from 0 to infinity (i.e., white property).
		Additive colored Gaussian noise: different from AWGN, the power spectral density is not flat over the range of frequency from 0 to infinity; the auto-correlation is not a delta function.
		The assumption of using VA is that transmitted symbols are i.i.d.
	www.cs.cmu.edu /~dpwu/books/EE/communications/commTheory.html (5473 words)

	The Channel
		This model extends the AWGN model simply by assuming that the stochastic process is not white, meaning that the noise distribution in this very moment might depend on its past behavior.
		Note that in this situation we have to carefully design the constellation so that the result after the whitening filter will be as our desired constellation.
		This Model extends the AWGN model simply by assuming that the channel has a deterministic effect.
	www2.rad.com /networks/2006/physical/channel.htm (719 words)

	MATLAB Central - Newsreader - please help me with awgn (Site not responding. Last check: 2007-10-29)
		I would like to plot the BER vs. Eb/No for 16QAM in AWGN channels.
		An AWGN function/block simply generates a normal random variable and
		Also type "doc awgn" at the MATLAB prompt to see all the different
	newsreader.mathworks.com /WebX?14@0.7WMsanAbbB6.0@.ef1a916 (0 words)

	CiteULike: jimh's awgn (Site not responding. Last check: 2007-10-29)
		Recent papers added to jimh's library classified by the tag awgn.
		posted to awgn coding layered rate-compatible superposition by jimh as
		awgn coding layered lt raptor rate-compatible rateless superposition
	www.citeulike.org /user/jimh/tag/awgn (72 words)

	AWGN Channel :: Channels (Communications Toolbox)
		An AWGN channel adds white Gaussian noise to the signal that passes through it.
		Describing the Noise Level of an AWGN Channel
		The relative power of noise in an AWGN channel is typically described by quantities such as
	www.mathworks.com /access/helpdesk/help/toolbox/comm/ug/a1069451448b1.html (0 words)

	[No title]
		IQCreator's AWGN feature is suitable for generating flexible and precise standalone AWGN power and repeatable signal-to-noise ratios (carrier noise or C/N).
		A precise and repeatable in-channel AWGN is especially important when determining a mobile receiver's sensitivity threshold.
		IQCreator's AWGN feature can also add noise in defined bandwidths, as a single interferer on one carrier signal or within multi-carrier applications.
	www.wirelessdesignasia.com /print.asp?id=313 (310 words)

	A Comparison of SNR Estimation Techniquesfor the AWGN Channel
		However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
		The SNR estimators are investigated by the computer simulation of baseband binary phase-shift keying (PSK) signals in real additive white Gaussian noise (AWGN) and baseband 8-PSK signals in complex AWGN.
		In addition to comparing the relative performances, the absolute levels of performance are also established; the simulated performances are compared to a published Cramér-Rao bound (CRB) for real AWGN and a CRB for complex AWGN that is derived here.
	www.comsoc.org /comm/private/2000/oct/1681_48comm10-pauluzzi.html (0 words)

	Citations: Lattice codes can achieve capacity on the AWGN channel - Urbanke, Rimoldi (ResearchIndex)
		Lattice codes can also be generated by the MLC approach, if the individual codes are subcodes of each other.
		Already de Buda [31] stated that lattice codes can approach the channel capacity of the AWGN channel.
		Although in multistage decoding (MSD) the code constraints at higher levels are not taken into account while decoding lower levels, suboptimum MSD suffices to achieve....
	citeseer.ist.psu.edu /context/381664/12615 (0 words)

	Noise Generator, C/N and Eb/No Generator AWGN Test Equipment from Micronetics
		Noise Generator, C/N and Eb/No Generator AWGN Test Equipment from Micronetics
		Drawing from more than 25 years of experience in the design and manufacture of additive white Gaussian noise (AWGN) products, and the fact that we received the original patent for the development of noise technology, Micronetics Test Solutions brings you the most accurate and stable noise generators and E
		These noise and interference test sets are designed to simulate real-world signal distortions from AWGN and multi-path.
	www.micronetics.com /noise/generator.html (0 words)

	AWGN Channel (Communications Blockset)
		You can specify the variance of the noise generated by the AWGN Channel block using one of four modes:
		Signal to noise ratio (Es/No), where the block calculates the variance from these quantities that you specify in the block mask:
		For complex input signals, the AWGN Channel block relates E
	www.technion.ac.il /guides/matlab/toolbox/commblks/ref/awgnchannel.html (0 words)

	Agilent \| N5182A-403 Calibrated Noise (AWGN)
		This real-time mode of operation generates truly uncorrelated noise with a noise bandwidth that can be continuously varied up to 100 MHz.
		The calibrated noise option is recommended for flexible stand-alone AWGN generation, and for setting signal-to-noise ratios directly in the Agilent MXG or with select Signal Studio software.
		The uncorrelated nature of the test stimulus is ideal for generating noise interference and is especially important for determining receiver performance.
	www.home.agilent.com /agilent/product.jspx?cc=US&lc=eng&ckey=794319&nid=-536906716.536910871.00&id=794319 (264 words)

	List of Figures
		Results for the synthetic circles image with AWGN
		Result for simple13pt filter trained and tested on synthetic/circles with AWGN,
		Result for simple13pt filter trained on synthetic/circles with AWGN
	osl.iu.edu /~tveldhui/papers/MAScThesis/node3.html (0 words)

	Press Release - Auust 16, 2005
		Stevenage, England-August 16, 2005 — To test mobile handsets for real-world noise conditions, Aeroflex is now including an AWGN (Additive White Gaussian Noise) source with its IQCreator software.
		IQCreator is a free Windows-based software application that enables a user to set up a wireless carrier modulation scheme and then create an arbitrary waveform file for use with the Aeroflex IFR 3410 and Aeroflex 3020 PXI series RF signal generators.
		IQCreator's AWGN feature is ideal for generating flexible and precise standalone AWGN power and repeatable signal-to-noise ratios (carrier noise or C/N).
	www.aeroflex.com /aboutus/pressroom/newsrelease/2005/081605.htm (0 words)

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