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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