Re: [Discuss-gnuradio] benchmark_tx and rx : too many FALSE packet

[SangHyuk Kim]

Dear, Nikos.

I want to check both of them.

Thanks!

2016-03-14 10:45 GMT+09:00 Nikos Balkanas <address@hidden>:

Hi Kim,

I can only test the benchmark_rx.py with my X300 (don't have transmitters connected)

I can find 2 benchmark_rx.py in my gnuradio-3.7.9.1:

The first is under examples/ofdm and the other under examples/narrowband

Which one do you need tested?

BR,

Nikos

On Mon, Mar 14, 2016 at 2:04 AM, SangHyuk Kim <address@hidden> wrote:

Could anyone try to this example commend ?

example code location = gnuradio/gr-digital/example/narrowband

Tx)

./benchmark_tx.py -f 1.5G -m qam -S 8

Rx)

./benchmark_rx.py -f 1.5G -m qam -S 8

Thanks.

2016-03-13 18:57 GMT+09:00 SangHyuk Kim <address@hidden>:

Dear Nikos.

the value 'ok' returns 'FALSE' as results of crc_check.

so, I think packet was corrupted.

It happened only some modulation using high bits per symbol (QAM, PSK)

Thanks

2016-03-13 18:41 GMT+09:00 Nikos Balkanas <address@hidden>:

Have you inspected the packets and verified them to be corrupt?

BR

Nikos​

On Sun, Mar 13, 2016 at 10:22 AM, SangHyuk Kim <address@hidden> wrote:

Hi all.

I'm using benchmark_tx(rx).py example

I experimented variety modulation schemes and GMSK, BPSK, QPSK modulation worked well

However, when I used QAM modulation, most of received packet were corrupted (FALSE)

ENV)

both TX and RX uses USRP N210 with ANT500 and CBX 40MHz

distance between TX and RX is shorter than 3m

TX)

./benchmark_tx.py -f 1.5G -m qam -S 8 --tx-gain=30

RX)

./benchmark_rx.py -f 1.5G -m qam -S 8

RESULTS ON RX)

ok = FALSE  pktno = 1  n_rcvd = 1  n_right = 0
ok = FALSE  pktno = 2  n_rcvd = 2  n_right = 0
ok = FALSE  pktno = 3  n_rcvd = 3  n_right = 0
...

ok = TRUE  pktno = N  n_rcvd = N  n_right = 1
...

Is this normal case of qam modulation ?

How can I get more TRUE packet using QAM modulation ?

Thanks.

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