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hello all,
In defining the the Electric field or the potential difference why is the term "Unit positive charge" used?
i.e. The electric field is the electrostatic force on a unit positive charge. and
The work done in moving a unit positive charge from one point to another in static field is...
if the channel behaviour is different for selected frequencies i.e it enhances certain frequency and attenuates other, it is referred to as a freq.selective channel.
in a lay man language the dips in the channel response at some frequencies will cause it to be frequency selective.
Hello all,
Can anyone please tell how generate random data in matlab with a specific data rate..!!
or a binary data stream with say sampling frequency of 20MHz..???
:?:
Re: Snr vs BER plot
@Communications_Engineer
how to model a frequency flat fading channel on matlab, which requires the Bandwidth of signal > bandwidth of channel and the delay spread> symbol period..??
if the bandwidth of singal is 20MHz..
hello,
I am studying about Power over Ethernet.
Can anybody please explain as why the ethernet cables are transformer coupled at each ends??
The POE configuration is shown in the image below..
Re: Snr vs BER plot
ok.
can u please tell me whether the BER curve for 4QAM modulation with ofdm and without ofdm over awgn channel should be
1. same or
2. slightly better..!
Re: Snr vs BER plot
so u mean to say dat
ifft->conv with channel--> awgn-->CP removal-->fft.
h=[0.2 0.4 0.7 0.8] % 4-tap rayleigh channel
=> CP should be removed in time domain itself.. rite!!
Re: Snr vs BER plot
hello Communication_Engineer
for ofdm matlab simulations, at the receciver end when to do the equalization, is it after the Cyclic prefix removal or before that...??:?:
Re: Snr vs BER plot
ya u two r rite... i dono wer I am mistakening..
I added awgn to the ofdm signal which is made up of 58 ofdm symbols=ofdm_strm
xt=ofdm_strm;
xt=awgn(xt,n);
then I did the reverse process of removal of CP, fft and then demodulation.
then I converted bak the decimal values...
hi..
can nyone pls show me snr vs ber plot for OFDM in awgn channel for 4-QAM.
modulation.
I got the plot but I fear its wrong, m getting prob. of error = 10^-3 at 24db..!!
plz gv a rply...:|
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