Thank Marcus.
"packet decoding" recovers message from received packet
and i got false from crc.py
def check_crc32(s):
if len(s) < 4:
return (False, '')
msg = s[:-4]
#print "msg = '%s'" % (msg,)
actual = digital.crc32(msg)
(expected,) = struct.unpack(">I", s[-4:])
#print "actual =", hex(actual), "expected =", hex(expected)
* print actual == expected*
return (actual == expected, msg)
2016-02-21 20:52 GMT+09:00 Marcus Müller <[email protected]>:
> Dear Sang Hyuk Kim,
>
> what "packet decoding" are you specifically talking about, and could you
> show us the code you've modified?
>
> Best regards,
> Marcus
>
>
> On 21.02.2016 12:32, SangHyuk Kim wrote:
>
> Hi, I transmit simple text file using two USRP N210
>
> Tx)
> file source -> packet encoding -> mod(GMSK) -> usrp sink
>
> Rx)
> usrp source -> demod(GMSK) -> packet decoding -> file sink
>
>
> To make corrupt packet, I tried to modify part of crc check
>
> I guess if the crc of received packet doesn't match with original one,
> receiver would discard the packet.
>
> However, I found receiver accepts every packet even if crc check returns
> 'false'.
> (I expected receiver accepts packet only pass crc check by 'true')
>
> Why it always return false and how can I corrupt packet with other ways ?
>
>
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