[USRP-users] 答复: frequency shift of B210

john liu johncorad1988 at gmail.com
Mon Jul 24 05:35:01 EDT 2017


HI,all,
Do you have any suggestions about this?
thank you.
best regards
John

On Mon, Jul 24, 2017 at 9:15 AM, 戚科峰(研三 福州) <qikefeng at ruijie.com.cn> wrote:

> Hi,Marcus,
>
>
>
> we use The B210 as a basestation and cc1120 as the tranceiver of UE.
>
> The B210 uses the Frequency offset estimation algorithm to estimate the
> frequency offset of cc1120 and records it.
>
> there are several UE in the system,UE will receive the B210'signal
> periodically and will send a signal to B210 in another period.
>
> when the phenomenon of the 3.2k frequency shift occured, all UE could not
> receive the signal of B210.when time for UE to send a signal,
>
> B210 would estimate the new frequency shift and found that the Frequency
> offset of every UE shifts 3.2k。So we think the shifting occured in B210
> instead of UE。
>
>
>
> best regards
>
>
>
>
>
> *发件人:* john liu [mailto:johncorad1988 at gmail.com]
> *发送时间:* 2017年7月21日 16:42
> *收件人:* Marcus D. Leech
> *抄送:* USRP-users at lists.ettus.com; 戚科峰(研三 福州)
> *主题:* Re: frequency shift of B210
>
>
>
> Hi,Marcus,
>
> We calculated this.
>
> The B210 not only generate a GFSK signal,but also received the signal from
> CC1120.The CC1120 and B210 both work in full duplex mode.
>
> Hi qi,
>
> Can you describe your test method?I am not clear for that.
>
>
>
> best regards
>
> John
>
>
>
>
>
> On Fri, Jul 21, 2017 at 10:47 AM, Marcus D. Leech <mleech at ripnet.com>
> wrote:
>
> On 07/20/2017 10:08 PM, john liu wrote:
>
> i am sorry.
>
> We generate a GFSK signal with B210 and  received the signal with multiple
> cc1120.When frequency shift occurred,the cc1120 can not received the
> signal.
>
> Also, another b210 has been running for several days without such a jump
> phenomenon.
>
> So, sorry to be a bother, but, where did the 3.2kHz frequency shift
> measurement come from?   The CC1120 is just a GFSK demodulating digital
> receiver.
>
>
>
>
>
> On Fri, Jul 21, 2017 at 9:37 AM, Marcus D. Leech <mleech at ripnet.com>
> wrote:
>
> No i mean what were you measuring?
>
>
>
> Were you using an external signal generator and what were its specs?
>
>
>
>
> Sent from my iPhone
>
>
> On Jul 20, 2017, at 9:09 PM, john liu <johncorad1988 at gmail.com> wrote:
>
> HI Marcus,
>
> internal with  TCXO.
>
>
>
> On Thu, Jul 20, 2017 at 11:31 PM, Marcus D. Leech <mleech at ripnet.com>
> wrote:
>
> On 07/20/2017 02:22 AM, john liu wrote:
>
>
>
> What was your tuned frequency in this case?
>
>
>
> Hi,Marcus,
>
>
>
> It is 433.05Mhz
>
> That's about 7PPM.
>
> What was your signal source?
>
>
>
>
>
> On Thu, Jul 20, 2017 at 11:46 AM, john liu <johncorad1988 at gmail.com>
> wrote:
>
> Hi all,
>
> We used B210 with TCXO,and run about 2 hours , a 3.2K frequency shift
> occurred when the temperature did not change significantly.Is it a normal?
>
> How can we improve this situation?
>
>
>
> thank you.
>
> best regards
>
> John
>
>
>
>
>
>
>
>
>
>
>
>
>
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