ACIR and ACR Calculator : ACLR and ACS Formulas

This page provides information about the ACIR (Adjacent Channel Interference Ratio) and ACR (Adjacent Channel Ratio) calculator. It also covers the formulas for ACLR (Adjacent Channel Leakage Ratio) and ACS (Adjacent Channel Selectivity).

What is ACIR and ACR?

The ACIR is a metric used to analyze potential co-existence issues between different radio systems operating in adjacent frequency channels. The ACR is the ratio of the power of a desired signal to the power of an interfering signal in an adjacent channel.

EXAMPLE:

• INPUTS:

  • ACLR (dB) = 60
  • ACS (dB) = 40
  • (C/I)Required (dB) = 20

• OUTPUTS:

  • ACIR (dB) = 39.96 dB
  • ACR (dB) = 60 dB

Formulas for ACLR, ACS, ACIR and ACR

following is the formula for ACIR, which combines the performance of both the transmitter and the receiver.

Input Parameters Required for calculator

1. ACLR (Adjacent Channel Leakage Ratio): This is a transmitter metric. It measures how much of the transmitter’s power “leaks” from its intended channel into the adjacent channel. A higher ACLR value (in dB) is better, as it indicates less leakage.

2. ACS (Adjacent Channel Selectivity): This is a receiver metric. It measures the receiver’s ability to process a desired signal in its own channel while rejecting interference coming from an adjacent channel. A higher ACS value (in dB) is better, indicating superior interference rejection.