Re: [Discuss-gnuradio] how to deal with "underride"

[zhengxiangwei]

I compared the difference when using GMSK and PSK in simple_trx.grc which use radio_hier.grc.

When use GMSK, 

it calls

gr_fir_fff: using SSE

When use PSK,

it calls 

gr_fir_ccf: using SSE

gr_fir_ccc: using SSE

Also I compare with benchmark_tx,

when use PSK

it calls gr_fir_ccf: using SSE

when use gmsk

it calls

gr_fir_fff: using SSE

I know c, f means different data type: complex and float.

Is it the reason why PSK fail to work? which calls additional  "gr_fir_ccc: using SSE"?

If it is not the reason, I will dive into framer, which may also cause failure in TX.

Thank you. 

 =================================
Xiangwei Zheng
Research Assistant
ECE Department, Virginia Tech
Office: Durham Hall 365
Tel: 540-553-6235

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From: address@hidden
To: address@hidden
Date: Mon, 10 Dec 2012 05:49:08 +0000
Subject: [Discuss-gnuradio] how to deal with "underride"

Dear all,

           I am wondering how to deal with "underride" of usrp2.

           I am using simple-MAC of pre-cog.

           I replace GMSK mod and demod block with PSK mod and demod in radio_hier.grc. Then the terminal show "UUUUUUUU pkt failed arq" when every transmission.

           My setting is gnuradio-3.6.2,USRP N210

           Any advice is welcome.

 =================================
Xiangwei Zheng
Research Assistant
ECE Department, Virginia Tech
Office: Durham Hall 365
Tel: 540-553-6235

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