Patent ID: 8705670

Claim:
A method comprising, at a receiver: receiving a radio frequency (RF) signal via an antenna; synchronizing the received RF signal with a preamble to determine a time base providing a temporal reference for detecting data in the received RF signal; determining a first energy value of the received RF signal by averaging received signal strength indication (RSSI) values of the received RF signal over a first period of time; determining a second energy value of the received RF signal by averaging RSSI values of the received RF signal over a second period of time; determining a difference value between the first energy value and the second energy value; comparing the difference value with a predetermined energy threshold value; determining a quality value of the received RF signal by correlating binary chips in the received RF signal with binary chips of a pseudonoise (PN) sequence; comparing the quality value of the received RF signal with a predetermined quality threshold value; and if the difference value exceeds the predetermined energy threshold value or the quality value is below the predetermined quality threshold value, then erasing the time base.