Hi Bastian:
Thank you so much.I use the ofdm example,and I think maybe the
crc is wrong as you said,thank you.
Best regards,
zs
At 2015-01-30 00:43:12, "Bastian Bloessl" <bloe...@ccs-labs.org> wrote:
>Hi,
>
>On 01/29/2015 03:13 PM, zs wrote:
>> Can you tell me,for general,in which circumstance,the packet header maybe
>> corrupt?
>
>This is very hard to tell since I don't know what you are doing. I guess
>you use a header_formatter in your flow graph and (for whatever reason)
>its header_parse method returns false.
>
>For example with the default header it looks like this happens if the
>CRC is not correct
>
>https://github.com/gnuradio/gnuradio/blob/master/gr-digital/lib/packet_header_default.cc#L132
>
>
>>
>>
>> At 2015-01-29 20:44:13, "Bastian Bloessl" <bloe...@ccs-labs.org> wrote:
>>>Hi,
>>>
>>>On 01/29/2015 01:03 PM, zs wrote:
>>>> Detected an invalid packet at item INFO: Parser returned #f".
>>>> The answer may be "RF settings are distorting your signal" or others.I
>>>> want to ask a question.Which block in gnuradio give us this hint.Where
>>>> is the source code of the block?And have someone can help me to explain
>>>> this problem more details?Why will have this error/warning?
>>>
>>>
>>>~/src/gnuradio >> ack-grep -C 3 "an invalid packet"
>>>gr-digital/lib/packet_headerparser_b_impl.cc
>>>80- );
>>>81-
>>>82- if (!d_header_formatter->header_parser(in, tags)) {
>>>83: GR_LOG_INFO(d_logger, boost::format("Detected an invalid packet at
>>>item %1%") % nitems_read(0));
>>>84- message_port_pub(msg_port_id, pmt::PMT_F);
>>>85- } else {
>>>86- pmt::pmt_t dict(pmt::make_dict());
>>>
>>>
>>>I guess your packet header is corrupt.
>>>
>>>Best,
>>>Bastian
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