https://devzone.nordicsemi.com/f/nordic-q-a/11868/co-channel-collisionHello, I am designing a custom protocol using the radio as a peripheral. The protocol has the chance for two nodes to transmit at the same time on the same channel. My understanding is that if one is much quieter than the other (e.g. because it isen-USTelligent Community 13Tue, 16 Feb 2016 21:07:40 GMThttps://devzone.nordicsemi.com/thread/44959?ContentTypeID=1Tue, 16 Feb 2016 21:07:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:176f8e53-a2d2-4360-914b-67ca382b0179&#216;yvind Karlsen<p>Hi,</p> <p>These questions are somewhat hard to answer without knowledge about what your protocol is designed to do.</p> <p>Essentially the unwanted transmitter on the same channel will increase the noise level significantly, you normally guard against this behaviour by only reusing frequencies after a certain number of cells. This is commonly illustrated by the figure below (this is extremely common in cellular networks).</p> <p><img src="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/cel_2D00_cluster.gif" alt="image description" /></p> <p>The radio uses the preamble to lock the receiver on the signal and starts comparing bits at the end of the preamble. It&#39;s pretty much the same as what&#39;s known as synch words.</p> <p>This preamble is always one byte long, 8 bits.</p> <p>Best regards,</p> <p>Øyvind</p><div style="clear:both;"></div>