is there someone having 2812's UCOS SOURCE CODE?

Digital Signal Processing

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  • 1. SI System urged to adopt "hella"
    Various news stories report the following: "In early 2010, Austin Sendek of UC Davis created a petition encouraging the SI system to designate "hella-" as the prefix for 10^27, following "yotta-" for 10^24." (Some sources mistakenly state that Sendek would like the nubmer 10^27 to be referred to as "a hella"; but this is not the case, and is obviously not even remotely grammatical.) Steve
  • 2. Fair comparison between time domain equalizer and OFDM
    Hi All So far I have worked on time domain equalizers such as LE and DFE. Recently I have started to work on OFDM systems. And I am trying to compare the performance for Proakis channel B which is three tap channel. First system: map the info bits to BPSK, pass the symbols through channel, add noise. The channel output I write it as y=conv(h,x)+noise, where h=[0.407 0.815 0.407] and x= +/- 1. At receiver perform LE using MMSE under the assumption that the channel is knonwn at the receiver. I get the exact BER plot given in Proakis comms edition 4. Second system: map the info bits to BPSK, perform IFFT, add cyclic prefix, pass it through channel and add noise. The channel output y=conv(h,x)+noise, where x=IFFT(X,N), X=+/- 1 and N=2048. At receiver, remove the CP, truncate the signal and performe one tap MMSE equalization i.e. \hat{X}=fft(H,N)/fft(y,N) and then take hard decision on real part. The problem is that the BER of system 2 is way off when compared to the BER of system 1. As a test case, when I removed the noise from system 2, I get 0 BER. Furthermore, when I put h=1 in system 2, I get the exact plot of BPSK on AWGN. Any idea on what I might be doign wrong? Your help is greatly appreciated. Regards Chintan
  • 3. Definition of BT in an FSK system
    BT denotes the product of the 3 dB bandwidth of the shaping pulse in an FSK system and the symbol time. My question has to do with the conventional definition of B. My first thought was to use the 3 dB bandwidth of a bandpass function obtained by translating the baseband pulse up to the FSK center frequency; or equivalently, twice the bandwidth (from 0 Hz to the 3 dB point) of the pulse viewed as a lowpass function at baseband. However, doing it this way results in a curve that disagrees with some published shaping curves; it appears people (in at least some cases) leave the factor of two out, and just look at the bandwidth of the lowpass function, from 0 Hz to the positive 3 dB point. What is the convention here? Thanks, Steve

is there someone having 2812's UCOS SOURCE CODE?

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



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