In this Tech Talk session, Kris Young, Field Applications Engineer for Silicon Labs, talked about the increasing challenges in wireless coexistence, its impacts on IoT application, and how Silicon Labs manage and offer built-in support for solving these challenges. Click here to watch the complete webinar and register now for future Tech Talks. Here are some key points from Kris’ session.
The Wireless Coexistence Challenge
What challenges exist in wireless coexistence? We have an ISM band at 2.4 GHz that’s very heavily used mostly because of different wireless protocols that share or coexist in the same band: Wi-Fi, Bluetooth, and IEEE 802.15.4 (Zigbee and Thread).
Although these wireless protocols have different modulation schemes, channel frequencies, and bandwidths, they all overlap when co-located, making a signal from one protocol sounds like noise interference to the other protocol. This causes problems in receiving messages between protocols because if the desired received signal is weaker than the noise, the radio is then unable to receive messages properly.
In the past, wireless devices seem to work even without specifically addressing coexistence issues. Unfortunately, ignoring the issues does not work anymore because of the following trends:
Looking further on the impacts of coexistence in IoT device development, we’ve determined two categories:
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