is there someone having 2812's UCOS SOURCE CODE?

Digital Signal Processing

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  • 1. Error-rate 2-PAM Vs. 4-PAM
    Hello, just got a small question about how to calculate the error-rate for th two different cases. I'm working on a school project where I'm testin 2-PAM vs. 4-PAM over an AWGN-channel with a fixed SNRdB = 10dB in bot cases. After running several tests in both C (ansi) and Matlab, it seems lik that the 4-pam system got something between 50-100 times the error-rate o the 2-pam system. But how do i prove this mathematically? Since the SNRdB is fixed to 10dB, and the symbol variance to 1, I get tha the decision levels for the 4-PAM case are -2*k, 0 and +2*k, where k 1/sqrt(5). But how do I do the rest? I assume I have to calculate the areas of th tales on the Gaussian curves for each case, but when I do that I dont ge any answer that makes me any smarter, at least not any answer backing u the numbers I get when I run the code for the system in each case. Anyone who could help me into the correct direction here? - drgz
  • 2. Confusion about FFT resolution - PLEASE HELP
    Could some DSP guru please clarify the following ? I have a simple audio application, in which at records time about 20000 bytes from the received audio signal. I am using PCM encoding with sampling frequency 16000, 16 bits, mono channel, little endian and signed. I wish to do FFT with the collected data. Since I collect bytes, I iterate through the buffer, collecting two bytes at a time, and with simple processing convert these byte pairs to shorts. I collect altogether 1024 shorts, by processing the first 2048 bytes of the raw data. From basic DSP principles we know that if 'N' data samples have been collected at a sampling frequency of 'fs' Hz, then the FFT resolution is: fs/N. So, in my case, is the resolution 16000/20000 or 16000/1024 ? I am confused. Please let me know.
  • 3. digital communcation book
    i know there are many books related to digital communcations but i want to ask please which is the best book that may be such a key to enable me to understanding the concept of digital communation well and then stret for looking for digital com in advanced

is there someone having 2812's UCOS SOURCE CODE?

Postby Wenhui Pan » Wed, 15 Dec 2004 19:29:33 GMT



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