US 12,476,872 B1
Physical layer transceiver with collision avoidance in high noise and interference environment
Shaoan Dai, San Jose, CA (US); Wensheng Sun, San Jose, CA (US); and Xing Wu, Palo Alto, CA (US)
Assigned to MARVELL ASIA PTE LTD, Singapore (SG)
Filed by Marvell Asia Pte Ltd, Singapore (SG)
Filed on Feb. 22, 2022, as Appl. No. 17/677,865.
Claims priority of provisional application 63/304,338, filed on Jan. 28, 2022.
Claims priority of provisional application 63/152,237, filed on Feb. 22, 2021.
Int. Cl. H04L 41/0896 (2022.01)
CPC H04L 41/0896 (2013.01) 20 Claims
OG exemplary drawing
 
1. A method for using a physical layer transceiver of an automobile to avoid data signal collision on a high noise or interference automotive multi-drop communication link, the method comprising:
receiving a signal at a first physical layer transceiver (PHY) device via a multi-drop communication link in a high noise or interference automotive environment, wherein the signal comprises noise or interference, present on the link, caused by the automotive environment regardless of whether data is being transmitted on the link;
determining whether a data transmission from a second PHY device is present within the noise or interference by:
separating the received signal into a first spectral component centered around a first frequency corresponding to a first logic level and into a second spectral component centered around a second frequency corresponding to a second logic level;
analyzing the first and second spectral components to determine whether both the first and second logic levels are detected in the first and second spectral components within a threshold period of time of one another; and
determining, based on the analyzing, whether the second PHY device is concurrently transmitting data on the link; and
in response to determining that a data transmission is not present within the noise or interference, permitting the first PHY device to transmit data via the link, and
in response to determining that a data transmission is present within the noise or interference, preventing the first PHY device from transmitting data via the link.