[USRP-users] 答复: frequency shift of B210

john liu johncorad1988 at gmail.com
Tue Jul 25 21:04:43 EDT 2017


Hi all,
Any suggestions is welcome.

best regards
Jong

On Mon, Jul 24, 2017 at 5:35 PM, john liu <johncorad1988 at gmail.com> wrote:

> 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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