|Subject:||Re: [Discuss-gnuradio] how to deal with "underride"|
|Date:||Thu, 13 Dec 2012 11:16:01 -0500|
I think frequency offset may not be the reason.The attachment is the oscilloscope picture. The first one use DBPSK modulation, which can be received by simple_trx.py. The second one use GMSK modulation, which can be successfully received by simple_trx.py.I wonder is there any reason may cause simple_trx.py fail to work using DBPSK.Thank you.
Date: Wed, 12 Dec 2012 12:07:31 -0500
Subject: Re: [Discuss-gnuradio] how to deal with "underride"
On Wed, Dec 12, 2012 at 11:49 AM, zhengxiangwei <address@hidden> wrote:
I compared the difference when using GMSK and PSK in simple_trx.grc which use radio_hier.grc.When use GMSK,it callsgr_fir_fff: using SSEWhen use PSK,it callsgr_fir_ccf: using SSEgr_fir_ccc: using SSEAlso I compare with benchmark_tx,when use PSKit calls gr_fir_ccf: using SSEwhen use gmskit callsgr_fir_fff: using SSEI 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 ZhengNo, this is not the reason. This is probably a channel filter used in PSK signals and not in the GMSK signals.Most likely the reason is frequency offset or too much or too little power.Tom
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