RF Basics, RF for Non RF Engineers - Wangwenxue/BLE-Study-WIKI GitHub Wiki

1.Voltage Ratio aV = 20 log (P2/P1) [aV] = dB

Power Ratio aP = 10 log (P2/P1) [aP] = dB

Voltage Level V‘ = 20 log (V/1µV) [V‘] = dBµV

Power Level P‘ = 10 log (P/1mW) [P‘] = dBm 0dbm=1mW

Double the power = 3 dB increase 10log(2)=3dB

Double the power = 3 dB increase

针对NRF51832 Programmable: +4 to -20dBm in 4dB step，以4db step也就是以2.5倍power调整。10log（2.5）=3.98

  1. Co-channel interference（CCI）同信道

adjacent channel rejection (ACR) 邻近信道

Co-channel interference or CCI is crosstalk from two different radio transmitters using the same frequency.

Adjacent channel rejection (ACR) is an important parameter for any radio receiver. It is a measure of how well a receiver performs on its frequency channel when there is an interfering system in the vicinity operating on a nearby channel.