DSP

physical layer A/D performance simulation
Hi, I want to simulate the physical layer for CDMA IS-95, i've wrote the bs_signal and the channel model, the rrc filter in the BS site(tx) use 8x oversampling with baseband model. The question is how to simulate the receiver-side's frequency error induced during downconverter and the A/D timing issue during A/... 15 Jan 2010 01:44

combining small FFTs to make a larger FFT
>On Jun 1, 8:06 pm, "digintu" <digi...(a)gmail.com> wrote: you're missing a step or two. if you're gonna stuff two halves of your length 128 data into two length 64 FFTs and post-process the results, you have to put the even-indexed samples in one and the odd- index samples in another. do two 64-pt FFTs, and po... 14 Jan 2010 06:50

How to effectively compute FFT from f_min to f_max, where f_min in not zero?
Thank you Michael, Rune and Kevin, to go more deeply about what is my goal: Yes, I really need a 4096 points describing 500 Hz range, exactly at range 2.5 kHz - 3 kHz. 16 seconds of data is not a problem. I can do the decimation to the approx. 4 kHz sample rate. Effectively means to compute this spectrum with small... 14 Jan 2010 05:45

What do you mean by dft modulated filter banks.
Its clear about the filter banks, but i can not understand what does the term DFT modulated means here. Can any one explain me please. ... 14 Jan 2010 14:38

STTC AND STBC
hellow every one tyo have good information about the following two subject 1_ space time trellis code (STTC) 2_ space time block code (STBC) which books you prefer thanx alot ... 13 Jan 2010 23:17

Performs IIR filtering using BF537 EZ-KIT
Hello!! I am trying to implement an bandpass butterworth IIR filter with fixed point coefficients. I have a wave file that should be filtered with this filter. I do not know how to set the filter characteristics in fdatool(matlab), so that all coefficients be in fixed point arithmetics, because I need them to progr... 13 Jan 2010 14:18

Auto-correlation of a circularly shifted sequence in frequency domain
Hello, I am trying to correlate a circularly-shifted sequence in frequency domain: i.e. I take a sequence that has been circularly shifted in time domain, do an FFT on it and try to correlate it in frequency domains. The time domain sequence is shifted by a random amount of samples. Since a circular shift in t... 13 Jan 2010 12:03

Stability from laplace transform analysis
All, Can any one pls explain me how "sigma" in s in laplace transform > 0 means un-stable system and < 0 means stable system? My understanding is completely reverse to that. BR, Dhaval ... 13 Jan 2010 08:41

Map controller output to PWM duty-cycle
Hello, I've a practical question regarding Digital Control Systems (specifically Switched mode power supply) implemented on DSP chip. Since that a controller is kind of IIR filter, I think this place is very suitable to this question. In power systems, the DC-DC converter (Buck, Boost, etc..) is normally describe... 12 Jan 2010 20:45

Generic name for time and frequency in filtering?
Is there a generic way to name what are usually the 'time' and 'frequency' domains for digital filtering? I seek a single term that can be applied for instance when the data to be filtered may be a (frequency) spectrum, or spatial positions, or angles. Chris ============================= Chris Bore BORES Si... 13 Jan 2010 15:26