Hi:
Now I run the example(tx_ofdm and rx_ofdm) through two usrps.(The version
of my gnuradio is 3.7.4).
1.But in the receive part I receive two many things like this:
INFO: Detected an invalid packet at item 139632
INFO: Parser returned #f
INFO: Detected an invalid packet at item 139680
Hi xianda,
I found out that using a factor of 0.05 in the multiply const works best
for me, with USRPs about 50 - 100 cm appart and rx and tx gains set to 0.
Try using a sample rate of 200k and you shouldn't get that sample rate
error again.
Regards,
Jawad
Hi Jawad:
Thank you so much for your kindly reply.
But the first problem still exist.Can you send me your test document and I
test.Thank you.
And the second problem is solved.Can you tell me why 200k is ok while 100k
failed?(they are all 10M/(even number)).Thank you.
Best regards,
xianda
At
On 26.05.2014 13:03, xianda wrote:
Hi:
Now I run the example(tx_ofdm and rx_ofdm) through two usrps.(The
version of my gnuradio is 3.7.4).
1.But in the receive part I receive two many things like this:
INFO: Detected an invalid packet at item 139632
INFO: Parser returned #f
Xianda,
Hi Jawad:
Thank you so much for your help.Now it can run.Thanks.
Best regards
At 2014-05-26 20:44:13,Jawad Seddar jawad.sed...@gmail.com wrote:
First of all, I removed the OFDM receiver part from tx_ofdm and replaced it by
a USRP sink and added a tag debugger to know when the data was generated
Hi Martin:
Thank you so much for your help.It can run.Thanks.
Best regards
xianda
At 2014-05-26 20:40:08,Martin Braun martin.br...@ettus.com wrote:
On 26.05.2014 13:03, xianda wrote:
Hi:
Now I run the example(tx_ofdm and rx_ofdm) through two usrps.(The
version of my gnuradio
On 05/23/2014 02:29 AM, xianda wrote:
Hi:
Thank you so much.
1.But from chunks to symbols I see you use the bpsk and qpsk
both.Right?What is the relationship between 800 bits and 17
symbols?Namely,how to calculate the 17 symbols?
17*64=1088.Can you explain?
1 OFDM symbol @ BPSK
On 05/23/2014 11:33 AM, xianda wrote:
Hi Martin:
Thank you for your reply.
But,
1.I see the virual Source(Stream ID:Payload Bits)-Chunks
to Symbols(Symbol Table(-0.707...))(modulate:qpsk)?When I input 800 bits
to the Packet Header Generator,then
Hi everyone:
I have already understand most part of the tx_ofdm.grc.But
the some digital i can't calculate accurately.
1.stream_to_tagged_stream: Packet length=96 bytes.?
2.And ofdm_carrier_allocator:FFT_length=64(but 48 occupied
IIRC, the tx and rx files are just a very general implementation of the OFDM
model.
Here's my understanding:
- Packet length refers to the data necessary to produce n symbols (48 data
carriers, 2 symbols = 96).
- The number of total carriers in the systems equals the FFT length.
In this case,
On 05/22/2014 10:12 PM, eontool wrote:
IIRC, the tx and rx files are just a very general implementation of the OFDM
model.
Here's my understanding:
- Packet length refers to the data necessary to produce n symbols (48 data
carriers, 2 symbols = 96).
Er, no. This is the number of bytes
Hi:
Thank you so much.
1.But from chunks to symbols I see you use the bpsk and qpsk
both.Right?What is the relationship between 800 bits and 17 symbols?Namely,how
to calculate the 17 symbols?
17*64=1088.Can you explain?
2.I have looked at your ppt about the ofdm.You say now have
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