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Re: BER expressions

In article , kongekung@hotmail.com (Konge Kung) wrote: > Hi > > I'm looking for some on-line resources/articles (IEEE?) > where I can find expressions for average bit error probabilities; > assuming a single transmitting antenna and L receivers under > a general M-QAM constellati...

Re: Kurtosis of constant signal

"Clay S. Turner" wrote in message news: ... > Hello Theo, > > For constant data, Pearson's Kurtosis = 1, and Fisher's Kurtosis = -2. > Whenever you see a zero over zero kind of thing, think about two things. One > is this going to be a meaningful result? and try to apply L'Hospital's ...

Re: 1/f noise generation

Jerry Avins wrote: > Andor wrote: > > > > Yu Xiaodong wrote: > > > Hi All, > > > > > > Is there anyone know how to generate 1/f noise for simulating the phase > > > noise. > > > > How do you define 1/f noise? How is does DC behave in this noise? > > > > Regards...

Re: Cramer rao bound on estimating amplitude of the signal using complex demodulation

praveenkumar1979@rediffmail.com (praveen) writes: > I am finding the amplitude of the signal using complex demodulation > (quadrature demodulation). I wanted to know maximum accuracy to > which the amplitude of the one of the frequency contained in phase > modulated signal(which is the inp...

generation of AWGN

hallo How can I generate a gaussian noise with : variance = SF/(2*EbN0); SF : spreading factor EbN0 : Eb/N0 Thanks a lot maca ...

Shannon's channel capacity with arbitrary noise!!

Hi all, It is not very common to discuss Shannon's channel capacity with an arbitrary noise. I guess we are more familiar with Shannon's channel capacity perturbed by white Gaussian noise. I also think there had been lot of discussions with Shannon's limit,Shannon capacity etc. previously. M...

Re: Rigorous definition of the Spectral Density of a random signal?

Carlos Moreno wrote: > They do not give a definition of what the > PSD is, but just spit a bunch of blah-blah about what I > would call "the consequences from an intuitive point of > view of what PSD is" :-\ You see how one can get pretty > frustrated :-( Yes. Look at Priestly; it f...

Re: Frequency Resolution of the DFT

Jerry Avins wrote: > > Frequency is the reciprocal of period. The frequency resolution of a > Fourier transform is the reciprocal of the time encompassed by the > samples fed to it. (When sampling for one second, frequencies of one Hz > can be resolved. When sampling for a minute, 1/60th ...

Re: LMS identifying Non-Min Phase systems

"Tom" wrote in message news:3FAD5D72.4C52C3@nOpam.com... > > > Vladimir Vassilevsky wrote: > > > Tom wrote: > > > > > > > create a reasonable amount of fixed delay in the > > > > Primary channel to make sure the primary signal will never arrive before > > > > the...

Re: GSM Training sequence

Hi Santosh, Assuming that I have perfect synchronization, I tried LMS and Least Squares to estimate the CIR. Also assuming that the channel lenght is 5. If I consider 16-bits for channel extimation, ML ie reducing to Least Squares for Gaussian noise gives me better estimate than LMS. Howeve...

Re: Linear Time-Varying System Identification

"Rune Allnor" wrote in message news:f56893ae.0311250132.6948a8c7@posting.google.com... > I would suggest sending a repeated pattern continuously for a long time, This is a quite good idea - in some cases, PN seqeunce is used as a input pattern in the transmitter to estimate the ch...

rayleigh channel modelling

Hi, I'm trying to simulate a rayleigh fading channel but have run into some problems. I asked about this a week ago and got some great replies with some excellent references and I've made progress since them, but I've still got more questions - mainly on how I relate theory to practice. So ...

Re: Query : Kurtosis

Thanks again, I have Gaussian noise but performing non-linear operations, so I am not sure what happend to the noise pdf. The paper 'The Meaning of Kurtosis:Darlington Rexamined': J.J.J.A Moors in 'The American Statistician, Vol.40, No.4(Nov.,1986),283-284' suggests that the kurtosis K > = ...

Re: Can achieve the Shannon capacity wihout coding?

On Thu, 18 Dec 2003, Rune Allnor wrote: > At the considerable risk of revealing my utter ignorance of > communications theory -- isn't the presence of a coding scheme, > however trivial, a condition for achieving communications? > > Suppose you monitor some channel. Unless you have acces...

Which noise?

Dear chaps, I have a problem. I have a signal recorded from a ultrasonic transducer of a chemical reaction. It is rich of noise, expecially the white one. I tried to filter with normal filter (butterworth band pass), but I did not obtained a lot of success. So, I thought was better delete the...

noise..how to regulate it?

Dear chaps, I have a problem. I have a signal recorded from a ultrasonic transducer of a chemical reaction. It is rich of noise, expecially the white one. I tried to filter with normal filter (butterworth band pass), but I did not obtained a lot of success. So, I thought was better delete the...

How to tell which channel the signal is transmitting

Hi Suppose I have a signal S=[s0 s1]^T both s0 and s1 are from the set of signal constellation C, the constellation C is known however S is not known. Now send the signal through some channel, we only know the channel model can be either H0 or H1 The receive signal could be expressed as Y...

Power and variance of Gaussian White Noise

hi there this is a newbie working on a signal denoising problem. i want to jam a given signal with a white noise pulsed jammer such that the effective jammer to signal ratio is some known value, say 30 db for example. to generate the wgn, i specify the variance in simulink for the gaussian...

Other Modulation Problem

A baseband signal m(t) that has a Gaussian (amplitude) distribution frequency modulates a transmitter. Assume that the modulation has a zero-mean value and a peak value of Vp = 4*(sigma). The FM signal is transmitted over an additive white Gaussian noise channel. Let Beta = 3 and B = 15KHz. Find...

An Academic Detection Question

This has been a question I've had for a long time. I have simplified it to its basic components. You have a signal x(t) composed as x(t) = u(t-t0) + n(t), where u(t) is the unit step function, t0 is unknown, and n(t) is stationary white Gaussian noise. You need to be able to detect the...

Re: FSK Demod using Quadrature Receiver with matched filters

GSB wrote: > I tried this stuff using Simulink, but was told to use M-file for more > control and accuracy. I had thought asking for help would be a fair > trade since I gave the FSK code out for free in exchange for some > advice. I suspect there are a few people copying the code for thei...

freq and phase estimation

What is the most effective way to adaptive estimate freqs and phases of the mixture (superposition) of the signals: s_i(t) = cos(2*pi*f_i*t+p_i)+n_i(t) , where i=1,2, ..., N and n_i is additive gaussian noise. Michal ...

simultaneous frequence and phase estimation

I am looking for methods which are able to simultaneously estimate the frequency (f_i) and phase (p_i) of the mixture (superposition) the simple "sinusoidal" signals with additive noise: s_i(t) = A_i*cos(2*pi*f_i*t+p_i)+n_i(t) , where i=1,2, ..., N and n_i is additive gaussian noise. Mi...

Implementation of OQPSK-demodulator in matlab

Hello I have made a program in matlab that can demodulate an OQPSK-modulated signal with noise (additive white gaussian noise). The carrier is phase-shifted with an arbitrary constant between 0 and 2*pi. Here is what I do to demodulate the signal: When the signal is received at time t=0 I...

question about white gaussian noise

does additive white gaussian noise only change the amplitude of a signal or does it change both amplitude and phase? ...

Re: key difference between CTC and CC schemes

On Mon, 18 Feb 2008 10:13:00 -0800 (PST), "PARTICLEREDDY (STRAYDOG)" wrote: > hi all, > years back i was asked about this question in interviews as > what is the key difference between CTC (CONVOLUTIONAL TURBO CODING) > and CC (CONVOLUTIONAL CODING) schemes. what i could answer at ...

Noise and Signal Subspace

I have a file with the values associated to the electric field for 32 different frequencies at a fixed point. Due to the RootMUSIC requierements, white gaussian noise is added to original vector, obtaining the noisy_matrix. After that I calculate the covariance matrix and then I get its eigenva...

How to set the parameter value for Rayleigh fading Simulation

When calcualate BER for certain modulation scheme, under Rayleigh fading, exact theoretical valuse is available from books and publications. But how to do set Rayleigh parameters in the simulation? For example, received signal is r(t) = Alpha * exp(-j*Phi) * s(t) + z(t) ( By Proakis 's...

Re: Decimation/interpolation

Regarding your concern over which is better 1 and 3, or 2 and 5, and you note on the difference between interpolating with the two sets: Don't lose sight of the fact that this "pick the odd points or pick the even points--I don't care" decimation works precisely because the signal is assume...

Re: Dither audio signal to 24 bits

"Stephan M. Bernsee" wrote in message news:42c34ef.0407100344.55129137@posting.google.com... > Well, but if you think about it - if you assume heavy processing after > the "final master", *any* such quality consideration becomes obsolete. If you'll think about it some more, signal modula...

Re: Matched Filter threshold

patrick.melet@dmradiocom.fr (Patrick) wrote in message news: ... > hi, > > I'm designing a CDMA-DSSS transceiver. > > At the receiver, the matched filter (MF) have peak at the output, so I > have to compare it to a threshold... > > How to compute the value of this threshold ? > ...

Re: Signal detection problem

Sounds like a DC shift in stationary white Gaussian noise. I think for a long term integrator and a short term integrator, the F-Ratio test is appropriate with the number of degrees of freedom equal to the the number of samples in the filters. A sliding boxcar filter would be nice from an an...

BER dependence on SINR

Hello, In case of r(t) = s(t) + i(t) + n(t) where r(t) - received signal s(t) - desired signal i(t) - interference signal n(t) - additive Gaussian noise then does the BER depend on Signal-to-{Interference + Noise} Ratio (SINR) directly For e.g. if s(t) is Binary...

Re: tone start/stop detection algorithms?

I am assuming the problem is as follows: x[n] = s[n] + w[n] s[n] = A*cos(2*pi*f_0/f_s*n + phi) * (u[n - n_0] - u[n - n_1]) where x[n] is the data you have s[n] is the signal you wish to detect w[n] is white Gaussian noise A is the unknown amplitude (a nuisance parameter) f_0 is the unk...

Re: Impact of complex limiter on BPSK BER

John Sampson wrote: > I am working on a fixed-point DSP-based coherent BPSK modem. In order > to improve the computational dynamic range of the clock recovery and > carrier tracking algorithms, I put a complex limiter on the complex > baseband. It comes after the signal has been filtered w...

Re: how to estimate the additive noise and get rid of additive noise in image?

If the noise isn't simply additive white gaussian noise, but actually exhibits some systematic behavior, there might be a way out if you can find a way to model the statistics of your noise. Now, that's gonna require some hardcore signal processing, and I'm not sure that's your game of choic...

Re: HTML posts are wasteful.

Thanks Jerry. I will make sure to post in text format next time Regards Nirav "Jerry Avins" wrote in message news:r7ednQn4S539gBPenZ2dnUVZ_sudnZ2d@rcn.net... > Nirav Shah wrote this mostly content-free HTML post: > > > This is a multi-part message in MIME format. > > ---...

capacity of multi-antenna channel - channel matrix unknown at receiver

Consider the memoryless, discrete time, matrix channels with additive Gaussian noise of the form Y = HX + Z, where H is the channel matrix, X is the original signals, and Y is the received signals. There is a growing body of literature discussing the capacity of such channel when H is known at...

Re: AES timing attacks

Jerry Avins wrote: > Tim Wescott wrote: > > ... > > > > I suspect that N may be quite large, > > > Amen to that! > > > > and the attack could easily be > > defeated by wrapping your cryptographic algorithm by a process that > > schedules the outgoing message so the ...

does WGN(white Gaussian noise) imple zero mean?

Hi all, I read through several books but did not get clarification on whether WGN(white Gaussian noise process) imply zero mean or not... Another confusion I have is that the definition of WGN is it has flat power spectrum density, let's say S(f)=1, then Rx(t)=delta(t) is its autocorrela...