## Near-Far Simulations in CDMA

Started by in Matlab DSP15 years ago

Hi all, I need to ask anyone who used to do the near-far simulations under Gaussian noise for CDMA system. Based on my brief understanding, in...

Hi all, I need to ask anyone who used to do the near-far simulations under Gaussian noise for CDMA system. Based on my brief understanding, in near-far simulation, we need to calculate the performance (BER) of receivers with two interferers, which are one with equal to the desired user and another one with a power which varies from certain dB below the desired up to certain dB above the desired ...

## How to generate AR and MA processes

Started by in Matlab DSP14 years ago

I am reading a book (Digital Signal Processing Handbook chapter 17) and there are some examples that talk about AR(1) and MA(3) processes. How...

I am reading a book (Digital Signal Processing Handbook chapter 17) and there are some examples that talk about AR(1) and MA(3) processes. How can I generate such processes in matlab?? The example I am reading says something like this: s1(n), s2(n) and v(n) are Gaussian zero-mean stationary and mutually uncorrelated. s1(n) is MA(3) with parameters [1, 0.2, 0.3, 0.5] and variance alp...

## Help with this matlab program

Started by in Matlab DSP18 years ago 2 replies

Hi I am trying to generate a gaussian monocycle using matlab. And i have the formula for that but the program gives me an error...

Hi I am trying to generate a gaussian monocycle using matlab. And i have the formula for that but the program gives me an error that "Subscript indices must either be real positive integers or logicals" for t=0.1e-9:0.01e-9:1e-9 s=1e-9/7; a(t)=(1-(

## filter function

Started by in Matlab DSP18 years ago

Hi All, is there any filter function in matlab that can filter the signal disturbed by awgn (additive white gaussian noise) ? ...

Hi All, is there any filter function in matlab that can filter the signal disturbed by awgn (additive white gaussian noise) ? can anyone help me... thx very much, arida

## Modeling Silence

Started by in Matlab DSP16 years ago

Hello !!! Is there any body who can guide me how to model silence in a wave file using Gaussian Mixture Models (GMM). I am using...

Hello !!! Is there any body who can guide me how to model silence in a wave file using Gaussian Mixture Models (GMM). I am using a five state (Left-to-Right) HMM but I am failing in catching silence areas in the wave file. Is there any one who can fix the problem. I am using MATLAB 7 Thanks.

## frequency domain representation of Rayleigh fading simulator in matlab

Started by in Matlab DSP19 years ago

How to generate complex gaussian random variables for each of N/2 positive frequency components od noise source In Matlab ...

How to generate complex gaussian random variables for each of N/2 positive frequency components od noise source In Matlab

## Near Far Simulations in CDMA System

Started by in Matlab DSP15 years ago

Hi all, I need to ask anyone who used to do the near-far simulations under Gaussian noise for CDMA system. Based on my brief understanding, in...

Hi all, I need to ask anyone who used to do the near-far simulations under Gaussian noise for CDMA system. Based on my brief understanding, in near-far simulation, we need to calculate the performance (BER) of receivers with two interferers, which are one with equal to the desired user and another one with a power which varies from certain dB below the desired up to certain dB above the d...

## AWGN,SNR,Eb/No

Started by in Matlab DSP18 years ago

Hi everyone, I want to simulate a W-CDMA downlink channel. To evaluate the performance I want to plot the BER over the Eb/No. ...

Hi everyone, I want to simulate a W-CDMA downlink channel. To evaluate the performance I want to plot the BER over the Eb/No. The matlab y=awgn() function adds gaussian noise to the spreaded and oversampled transmitted signal. So how can I scale the noise power for oversamplin

## Finding determinant of 200*200 matrix

Started by in Matlab DSP14 years ago 2 replies

Dera Sir, I am new to the area of statistics. I am trying to find the determinant of a 200*200 covariance matrix of a Gaussian distribution....

Dera Sir, I am new to the area of statistics. I am trying to find the determinant of a 200*200 covariance matrix of a Gaussian distribution. Due to so many multiplications of fractional numbers it gives O as the result. Can anybody tell me how to solve this particular problem. Thanking you ROSHAN JOY MARTIS

## generating waveforms

Started by in Matlab DSP14 years ago 1 reply

hi guys I'm very new to Matlab and DSP and am in a bit a nitch.I need to generate waveforms of 512 samples centred on sample 200 andI also...

hi guys I'm very new to Matlab and DSP and am in a bit a nitch.I need to generate waveforms of 512 samples centred on sample 200 andI also need to normalise the amplitude of each waveform to give it unity area The wave forms are: 1. rectangular and triangulr pulses with 45 samples wide 2. Gaussian with st of 13.5 and a hamming window at N=66 really struggling with this one problem in ...

## query related to a clustering problem

Started by in Matlab DSP13 years ago

dear all ? i am engaged in clustering the histogram data of a periodic signal with gaussian noise added,,, i am using the Hierarchical...

dear all ? i am engaged in clustering the histogram data of a periodic signal with gaussian noise added,,, i am using the Hierarchical Clustering for this purpose ? Hierarchical Clustering ( Multivariate Statistics )?? is found under Statistic Toolbox in MATLAB ,, ? while using the inconsistent function to define natural?cluster divisions ?in the data i can not understand how to use the dept...

## rice and nakagami distributions

Started by in Matlab DSP14 years ago

Hello! I have to generate two random sequences of fixed length (k). One with a rice distribution and the other with nakagami distribution( with...

Hello! I have to generate two random sequences of fixed length (k). One with a rice distribution and the other with nakagami distribution( with characteristic parameter m). I've found in literature that a rice distribution can be obtained as the square root of the sum of squares of 2 independent gaussian variate (one with non zero mean). So I suppose I can generate it in Matlab with ,for exampl...

## handling fft

Started by in Matlab DSP17 years ago

I am producing a signal modulated by a gaussian. What I do not control are the small peaks that appear in the signal. Are they a consequence...

I am producing a signal modulated by a gaussian. What I do not control are the small peaks that appear in the signal. Are they a consequence of the discretenes of fft's? N=1024; k=1:1:N; for i=1:N, phireal0(i)=10.*exp(-i^2/(N/10)^2/2); end phir0=fft(phireal0); for i=1:1:N, phir(i)=phir0(i)*exp(2*pi*j*ran

## Simulating LDPC codes

Started by in Matlab DSP16 years ago

Hi, I'm simulating various code rate LDPC codes in AWGN channel. I'm not sure how I should scale the gaussian r. v. for adding the noise...

Hi, I'm simulating various code rate LDPC codes in AWGN channel. I'm not sure how I should scale the gaussian r. v. for adding the noise when I include the rate R of the LDPC code. In theory, this should be the square root of the variance. As I have below, I'm dividing by 2*R. Is this right? Or should I be multiplying by R? sigma=sqrt((10.^(-SNRd

## Autocorrelation function of bandpass stochastic process

Started by in Matlab DSP15 years ago

I am new to band pass stochastic processes. power spectral density of a low pass gaussian stochastic process x(t) is given. How to find the...

I am new to band pass stochastic processes. power spectral density of a low pass gaussian stochastic process x(t) is given. How to find the autocorrelation function of x^2(t) { x square of t }. Can anybody tell me please.

## Inverse Filter

Started by in Matlab DSP13 years ago

Hi there, I am measuring the output of a mechanical manipulator in response to band limited gaussian white noise. This then allows me to calculate...

Hi there, I am measuring the output of a mechanical manipulator in response to band limited gaussian white noise. This then allows me to calculate the transfer function using - cross-power spectral density of the stimulus and the response divided by the auto-PSD of the stimulus. I have been able to achieve this in matlab. Now, I want to nullify the effect of the manipulator using a inverse filter ...

## block processing, filter behaviour

Started by in Matlab DSP16 years ago

Hello I have a question about filter behaviour and block processing. I have a signal x[k]=s[k]+n[k] where s is clean speech and n is ...

Hello I have a question about filter behaviour and block processing. I have a signal x[k]=s[k]+n[k] where s is clean speech and n is colored, gaussian noise. In the algorithm I am working on I do block processing. Each block xb[j]=(x[1+L*j],x[2+L*j],.....,x[L+L*j]) where xb[j] is the j'th block-input is sent thru 2 filters

## EDGE MODULATION:__ HOW TO integrate as per the following FUNCTIOn

Started by in Matlab DSP12 years ago

PLEASE HELP ME IN WRITING THE CODE FOR THE linearized GMSK pulse.. I'M NOT ABLE TO FIND THE DEFINITE INTEGRAL OF A FUNCTION ,, WHOSE UPPER...

PLEASE HELP ME IN WRITING THE CODE FOR THE linearized GMSK pulse.. I'M NOT ABLE TO FIND THE DEFINITE INTEGRAL OF A FUNCTION ,, WHOSE UPPER LIMIT IS A VARIABLE... I' HAVE TO INTEGRATE A GAUSSIAN PULSE OVER THE INTERVAL 0 TO 't' ACTUALLY I'M DESIGNING A FILTER FOR 8PSK MODULATION AND I HAVE TO DESIGN THE FILTER according to ETSI STANDARDS :: GSM 05.04 VERSION 8.1.2 rELEASE 1999 ,, ETSI ...

## UWB position location

Started by in Matlab DSP15 years ago

Dear Friends!! In these days i'm doing research on UWB indoor position location..and I'm new in this field so I need your help: I assumed...

Dear Friends!! In these days i'm doing research on UWB indoor position location..and I'm new in this field so I need your help: I assumed enviroment with 3 BSs (Base station) and one mobile in Line Of Sight, I know position of all 3 BSs and I have to calculate Mobile's position. I used 1st derivative Gaussian monocycle with 0.5nsec duration, and sampling rate is 20 GHz. In my simulation, ...

## channel

Started by in Matlab DSP16 years ago

Hi all, i m not clear about AWGN channel . most paper and book consider that channel is Gaussian and it has zero mean and N0/2 noise...

Hi all, i m not clear about AWGN channel . most paper and book consider that channel is Gaussian and it has zero mean and N0/2 noise spectral desnsity for eatch side. i just clear channel is random it has normal valriable(zero mean) and noise what is the meaning of two sided spectral density is it transmitter side as well as receiver side noise level. What is the relation between