DSP

Multisim results
Hi all, I designed an amplifier circuit for very low currents and so it has to be extremely accurate. I considered the offset currents and voltages of the opamp and from the calculations it seems like the circuit is going to be 0.8% accurate worst case value considering all the temparature effects. I use Multisi... 20 Oct 2006 07:43

Anybody knows from where can i buy TMS320C6455 DSK ?
Hi everybody TI's store doesn't sell the TMS320C6455 DSK neither the distributor. Aybody knows for where i can buy the DSK? Thanks Ayman Shalaby ... 19 Oct 2006 08:07

OFDM Trasmitter
Hi, I am trying to design an OFDM trasmitter. My current structure is as follows: IFFT -> Cyclic Prefix insertion on I and Q -> x4 interpolation filter on I and Q -> I/Q quadrature modulator -> output to DAC. My question is related to the interpolation filters. The convolution between the input to the fi... 19 Oct 2006 08:07

Filter Method for Simulation of Wireless Channel
Hi guys, havent posted here in a while, but I've been reading plenty... I am simulating a frequency selective Rayleigh fading channel and I'm looking at the Filter method (M. Patzold, "Mobile Fading Channels", Wiley 2002). I've read most of the comp.dsp posts on Rayleigh fading as well as quite a number of papers... 18 Oct 2006 09:30

Simulation of symbol synchronization in a OFDM receiver
Dear all I am doing a block for a OFDM receiver that receives as input the ofdm received signal and gives as output a rectangular signal (for synchronization) in which each pulse represents a peak in the autocorrelation function realised over the ofdm received signal. How can i define a threshold to detect this p... 16 Oct 2006 04:56

Derivative of 2d function with fftw
I wont to calulate the derivative of the function f(x,y)=sin(x)*cos(y) in [0,6.28]x[0,6.28] (or any other function). I make the fft of f I make the product of the coefficient for the frequency,and calculate the inverse fft but there are strange oscillation in the derivative in the contour of the domain. I thi... 21 Oct 2006 15:36

16-QAM Monte Carlo computer simulation
Hi, i need to do a symbol error rate calculation base on the 16-QAM Monte Carlo simulation and also the 16 QAM theoritical formula.My question is, how to i change the following PSK Monte Carlo simulation code into the QAM Monte Carlo simulation code? since we know the QAM is the PSK + PAM. Thanks for any help. % ... 13 Oct 2006 07:48

.m file for S-Random Interleaver design
Hi I need an efficient .m file for designing S-Random Interleavers. I wrote one, but it did not converge for L=1024 & S=15. Thanks ... 11 Oct 2006 09:02

Channel models for HIPERLAN/2 ETSI/BRAN Doc.
Dear All, Can somebody help me in finding the following documents? 1. J. Medbo and P. Schramm, "Channel models for HIPERLAN/2," ETSI/BRAN document no. 3ERI085B. 2. J. Medbo and J-E. Berg, "Measured radiowave propagation characteristics at 5 GHz for typical HIPERLAN/2 scenarios," ETSI/BRAN document no. 3ER... 11 Oct 2006 07:59

Small periodic errors in DPLL's VCO voltage
Hi folks, i have come across a strange phenomenon that i am fighting with since days now and the time has come that i am completely out of any ideas. That is why i am asking you. I sample fixed frequency sinusoidal audio signals of abt. (but not exactly) 100 Hz with a semi-professional 24 bit sound card and a ... 12 Oct 2006 13:25