User's Guide Part 1

PureWave Quantum 6600 User Guide v2.1
Page 22
Note that some regulations refer to peak power, which in a WiMAX system is normally as much as 10dB
higher than average power. In the case of the PureWave Quantum products the peak power can be
assumed to be 9dB higher than average. Therefore, Peak EIRP should be computed as follows:
Peak EIRP per Ant (in dBm) = Ave EIRP per Ant + 9dB.
Total Peak EIRP (in dBm) = Total Ave EIRP + 9dB.
For the above example, Peak EIRP per Ant = 46dBm + 9dB = 54dBm and Total Peak EIRP = 53.78dBm +
9dB = 62.78dBm. These equations are summarized in Table 5.
Table 5: EIRP Calculations
Note that some regulations are specified for particular channel bandwidths and/or
antenna beamwidth and in such cases the allowable power should be scaled accordingly.
As with the previous calculations, each case is often unique. Although the PureView NMS
provides guidance and limits where known regional regulations apply, it is ultimately the
responsibility of the spectrum holder to assure that appropriate limits are set.
EIRP Metric
Formula
Ave EIRP per Ant (in dBm)
= Ave Tx Pwr per Ant + Ant Gain – Cable and Connector Loss
Total Ave EIRP (in dBm)
= Ave EIRP per Ant + 10log(Number of Antennas)
Peak EIRP per ant (in dBm)
= Ave EIRP per Ant + 9dB
Total Peak EIRP (in dBm)
= Total Ave EIRP + 9dB