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CC1125: 检测周围的干扰

jerome ebaeab
Part Number: CC1125
Other Parts Discussed in Thread: CC1175

HI TI

我们使用CC1125在869MHz的频段上；我们希望能检测到869MHz的干扰，请问CC1125能实现吗？有哪个寄存器可以获取到干扰的强度？

如果不能，那么我们有什么其他方法可以获取到周围869MHz无线电干扰情况？

谢谢

  • 0
    TI__Guru**** 252096 points

    您可以参考下该文档

    https://www.ti.com.cn/cn/lit/an/swra479a/swra479a.pdf 

    Selectivity and blocking is the radio’s ability to handle RF interference. Selectivity is the ability to handle interference from unwanted RF signals operating in the same frequency band. Blocking is the ability to handle unwanted RF signals that are operating at a different frequency several MHz away

    jerome ebaeab 说：
    有哪个寄存器可以获取到干扰的强度？

    据我所知，没有这样的寄存器

    jerome ebaeab 说：
    如果不能，那么我们有什么其他方法可以获取到周围869MHz无线电干扰情况？

    能否说一下为何要这样做？

  • 0 回复 Susan Yang
    Susan Yang 说：
    能否说一下为何要这样做？

    我们希望在有外界强烈干扰的情况下，CC1125已无法正常解析数据，这是可以给用户一个提示，来指示周围的无线电干扰；

  • 0 回复 Susan Yang

    HI 

    我在文档：swru295e  < CC112X/CC1175 Low-Power High Performance Sub-1 GHz RF Transceivers/Transmitter  User’s Guide >的6.9.1章节看到

    cs

    我理解这个就是我需要的功能，也请您帮忙看下；谢谢

  • 0 回复 jerome ebaeab
    TI__Guru**** 252096 points
    jerome ebaeab 说：
    我理解这个就是我需要的功能

    是的，我看了下确实比较符合您之前的需求。您可以在板子上测试一下。另外请注意6.9 RSSI的说明

    Carrier Sense (CS) indication will also be affected by the setting of AGC_CFG0.RSSI_VALID_CNT. After the RSSI is valid it will be continuously compared to the CS threshold set in the AGC_CS_THR register, but since the RSSI update rate is given by the RSSI_VALID_CNT register field, this will in practice limit the CS update rate as well. The exception is when the CS threshold is changed while in RX mode. The CARRIER_SENSE signal will then be updated immediately (if needed). For more info on CS, see Section 6.9.1. Figure 15 shows when CS is updated with respect to the RSSI.

  • 0 回复 Susan Yang

    HI 

    ＯＫ，另外，我们需要通过 EN 50134-3 标准中　5.5.5章节干扰检测的要求：见下图：请问这种场景下， AGC_CS_THR寄存器应该设置多少？ＴＩ有没有推荐值或经验值？

  • 0 回复 jerome ebaeab
    TI__Guru**** 252096 points

    https://e2e.ti.com/support/wireless-connectivity/sub-1-ghz-group/sub-1-ghz/f/sub-1-ghz-forum/842836/cc1120-carrier-sense-threshold-configuration-of-cc1120-if-absolute-and-relative-value?tisearch=e2e-sitesearch&keymatch=AGC_CS_THR%25252520%25252520value# 

    https://e2e.ti.com/support/wireless-connectivity/other-wireless-group/other-wireless/f/other-wireless-technologies-forum/265549/is-cc1125-s-carrier-sense-threshold-maximum-value?tisearch=e2e-sitesearch&keymatch=AGC_CS_THR%25252525252525252520%25252525252525252520value# 

    请看一下上面的讨论，目前没有推荐的值，您需要根据实际结果来自己设置