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List: gnuradio-discuss
Subject: Re: [Discuss-gnuradio] Channel model & frequency offset
From: Benny Alexandar <ben.alex () outlook ! com>
Date: 2017-10-27 17:19:52
Message-ID: PN1PR0101MB1166F0FB87D4832CBE4C34B98B5A0 () PN1PR0101MB1166 ! INDPRD01 ! PROD ! OUTLOOK ! COM
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________________________________
From: Benny Alexandar
Sent: Friday, October 27, 2017 6:38 AM
To: discuss-gnuradio@gnu.org
Subject: RE: [Discuss-gnuradio] Channel model & frequency offset
Hi Atif,
For frequency offset , a signal with (cos ((w + delta)t) + j sin((w + delta=
)t)), where delta is the offset compared to original signal.
This can be achieved by creating a grc as attached. In this grc the signal =
source (Tx) sample rate is fixed and in the sink (Rx) which is fft, the sam=
ple rate is slightly offset to create the frequency offset.
You can add a slider for sample rate offset, and move to see the effect.
Similarly If you want to create a time offset, which is (cos (w + delta(t))=
t) + j sin(w + delta (t))t), where delta (t) is a monotonous function over =
t: in case delta (t) is positive, the frequency offset will increase over t=
ime.
-ben
---------------------------------------------------------------------
I am trying to analyze channel model effect between am transmitter and rece=
iver but whenever i change frequency offset using slider i can't be able to=
see the frequency change. In both transmitter and receiver are at the same=
frequency .
Best,
ATIF JAVED
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" \
style="font-size:11pt" color="#000000"><b>From:</b> Benny Alexandar<br> <b>Sent:</b> \
Friday, October 27, 2017 6:38 AM<br> <b>To:</b> discuss-gnuradio@gnu.org<br>
<b>Subject:</b> RE: [Discuss-gnuradio] Channel model & frequency offset</font>
<div> </div>
</div>
<div>
<div style="font-family: Calibri,Helvetica,sans-serif; font-size: 12pt; color: rgb(0, \
0, 0);"> Hi Atif,</div>
<div style="font-family: Calibri,Helvetica,sans-serif; font-size: 12pt; color: rgb(0, \
0, 0);"> <br>
</div>
<div style="font-family: Calibri,Helvetica,sans-serif; font-size: 12pt; color: rgb(0, \
0, 0);"> <br>
</div>
<div style="font-family: Calibri,Helvetica,sans-serif; font-size: 12pt; color: rgb(0, \
0, 0);"> <span>
<div><font size="3" color="black" face="Calibri,Helvetica,sans-serif"><span \
style="font-size:12pt;">For frequency offset ,</span></font><font size="3"> </font>a \
signal with (cos ((w + delta)t) + j sin((w + delta)t)), where delta is \
the offset compared to original signal.</div> <font size="3" color="black" \
face="Calibri,Helvetica,sans-serif"><span style="font-size:12pt;"> <div>This can be \
achieved by creating a grc as attached. In this grc the signal source (Tx) sample \
rate is fixed and in the sink (Rx) which is fft, the sample rate is slightly offset \
to create the frequency offset. <br>
</div>
<div>You can add a slider for sample rate offset, and move to see the effect.<br>
</div>
<div> </div>
<div>Similarly If you want to create a time offset, which is (cos (w + \
delta(t))t) + j sin(w + delta (t))t), where delta (t) is a monotonous \
function over t: in case delta (t) is positive, the frequency offset will increase \
over time. </div> </span></font></span></div>
<div style="font-family: Calibri,Helvetica,sans-serif; font-size: 12pt; color: rgb(0, \
0, 0);">
-ben<br>
</div>
<div style="font-family: Calibri,Helvetica,sans-serif; font-size: 12pt; color: rgb(0, \
0, 0);"> <br>
</div>
<div style="font-family: Calibri,Helvetica,sans-serif; font-size: 12pt; color: rgb(0, \
0, 0);">
---------------------------------------------------------------------<br>
</div>
<div style="font-family: Calibri,Helvetica,sans-serif; font-size: 12pt; color: rgb(0, \
0, 0);"> <br>
</div>
<div style="font-family: Calibri,Helvetica,sans-serif; font-size: 12pt; color: rgb(0, \
0, 0);"> <span>
<div>I am trying to analyze channel model effect between am transmitter and receiver \
but whenever i change frequency offset using slider i can't be able to see the \
frequency change. In both transmitter and receiver are at the same frequency . </div>
<div></div>
<div>Best,</div>
<div>ATIF JAVED</div>
<div><br>
</div>
</span><br>
</div>
</div>
</body>
</html>
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