AN-30 System User Manual
modulation scheme for uplink and downlink. In this manner, the network can be balanced
for the optimum spectral efficiency, no matter what propagation conditions prevail.
Higher order modulation schemes (i.e., 64 QAM) are typically deployed at reduced
ranges while lower order modulation schemes (i.e., BPSK) are implemented at long
distances.
A sample link budget is shown in Figure 22 for the AN-30 system operating in 64 QAM,
3/4 code rating, providing a net burst throughput of 54 Megabits per second (Mbps). This
provides an average throughput of 43 Mbps to the Ethernet port. The calculation is
performed for LOS, however the graph (shown in Figure 23 below) also covers the
OLOS and NLOS conditions.
Figure 22: Link Budget For 64 QAM ¾ Code Rate
A fade margin graph for this link budget is given in Figure 23 below for four conditions:
LOS (a - blue line), OLOS with the first Fresnel zone obstructed (b - red line), NLOS
scattered trees and buildings (c - green line) and heavily treed residential NLOS (d -
magenta line).
Page 70 of 80
Redline Communications
…..solving the first mile challenge
