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- 1. i need books for ....

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 - 2. Meaning of DFT

Hi I am trying to understand DFT values in terms of a signal which is a sum of a DC term and cosine terms. This is explained somewhat in the book 'Understanding Digital Signal Processing' by Richard G. Lyons, but I feel there are some gaps in the explanations in chapter 3 of the book. On pg. 61 says: "When a real input signal contains a sinewave component of peak amplitude A with an integral number of cycles over N input samples, the output magnitude of the DFT for that particular sinewave is M, where M = A x N / 2" All right, my question concerns the DFT value X(N / 2) when N is even and the signal is the Nyquist cosine with phase pi/4: x(n) = cos(2pi fs/2 n/fs + pi / 4) = cos(pi n + pi / 2) = { sqrt(2)/2, -sqrt(2)/2, sqrt(2)/2, ...} Using fs = 8000, and taking DFT of 8 samples gives X(4)/N = 1.4142 = sqrt(2) The signal is interpreted as being a sinewave with amplitude sqrt(2)/2. Can someone explain why this happens? Arni - 3. benchmarking advanced interface using fftw bench

Hi, I would like to use the fftw bench program to time the following. Use plan_many_dft from Advanced interface to calculate a bunch of ffts on a contiguous array of complex numbers. Can some one help me with the options i need to pass on to fftw bench program to be able to choose plan_many option. I the readme file, suggestions for inplace and out of place 2d fft examples are shown. Apparently the program has the option to specify plan_many. but it is not clear as to how that can be specified. Thanks gvsaradhi

1.Data Recovery SOURCE CODE ( SOURCE CODES of Professional Data Recovery Software )

2.Is "hamming code" a channel or source coding?

Hi, I was asked to do some research on this "hamming code" and compare its efficiency with huffman coding? But i remember from my class and context book, hamming code is some kind of error correction channel coding scheme. As I right? if yes, how can I compare the efficiency of a channel coding to source coding? I have already thrown away all my knowledge from classroom. Thanks

Hi, I am trying to setup a 2812 to take A to D readings. I have the ADC setup for 10 readings (MAXCONV=9), cascaded sequencer, continuous run, and to branch to the ADC interrupt at the EOS (end of sequence). When the program branches to the interrupt routine, I read and store the result registers to variables. My problem is that the result registers never change their value even when I vary the applied signal between 0V and 3V. Any suggestions? Also, I have the ADC set to suspend mode0 where an emulation suspend is ignored (i.e. the ADC continues to sample even when I hit a breakpoint?). Would this have anything to do with it? Alex

4.flash and external ram timing on TI 2812

Hello ! Would someone be able to explain me how to calculate the execution time o a NOP instruction when it is executed into flash and into external ram of DSP TI 2812? Is it normal to have a time more important (2*) into ram than into flas ? Is it normal to see that a change into the configuration of XINTF doesn' change the execution time ? Thanks a lot for your answers

5.What not to do? TI - 2812 - FLASH

Hi all, This is regarding flashing a code in 2812 processor from TI. I tried flashing a sample code from spectrum digital using the SDFlash utility. I was able to flash it a couple of times, but after that it was consistently showing errors in flashing. Actually the probelm was with locking and unlocking the device using CSM. The important point to be noted as far as flashing is concerned is that the device has to be reset once ( soft reset thru the SDFlash utility ) and then flashed, but not the reverse. In case u accidently reset the device after flashing, it places 0000 in all the password locations and locks the device permanently and after that ur device cannot be debugged or reprogrammed. In case u r using an eZDSP kit from spectrum digital, u can download ur code through JTAG and continue working with onchip and off chip RAM, but secure RAM locations and FLASH memory cannot be touched. More information on the CSM can be obtained from the TI user guide SPRU078A.

6. use external memory of eZdsp 2812

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