Motorola Canopy Backhaul Module Guía de usuario descargar pdf (Pagina 82)

45 Mbps Backhaul User Guide

Issue 3, December 2004 Page 81 of 113

The receive sensitivities and system gains for each mode are as follows:

Mode

RX Sensitivity

TX Power

System Gain

BPSK 1/2

-95.5 dBm

24 dBm

166.5 dB

QPSK 1/2

-92.8 dBm

23 dBm

162.8 dB

QPSK 2/3

-90.7 dBm

23 dBm

160.7 dB

16QAM 1/2

-88.1 dBm

21 dBm

156.1 dB

16QAM 3/4

-83.6 dBm

21 dBm

151.6 dB

64QAM 2/3

-80.2 dBm

19 dBm

146.2 dB

64QAM 3/4

-78.3 dBm

19 dBm

144.3 dB

64QAM 7/8

-73.6 dBm

19 dBm

139.6 dB

The values quoted here are static sensitivity measurements. When AMOD is in operation, margins are applied

to the up and down shifts between modes to ensure seamless changes without loss of data. The margins applied

are dynamic and selected dependant on the prevailing link conditions.

The margins applied are as follows:

Fading

Mode Up Shift

Mode Down shift

Slow

1.5 dB

Fast

6 dB

3 dB

For example: In a fast fading environment an up shift from 16QAM _ to 64QAM 2/3 will occur at –74.2 dBm (-

80.2 dBm + 6 dB) and the down shift from 64QAM 2/3 to 16QAM _ will occur at –77.2 dBm (-80.2 dBm + 3

dB).

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Motorola Canopy Backhaul Module Guía de usuario Pagina 82

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