Product Info

WipLL Radio Technology - Physical Layer System Description
2-26 Airspan Networks Inc. 25030311-08
2.6.2.2.2. Link Budget Results
Based on the previous formulas mentioned in the above sections, the following link
budget results can be obtained for 99.9% availability:
Range (in km) Modulation Rate
(Mbps)
2.4
GHz
2
MMDS
(2.5
GHz)
3.5 GHz 5.8
GHz
900
MHz
700
MHz
8 FSK 3 or 4 8 8 7 6 8 15
4 FSK 2 11 11 10 8 11 22
2 FSK 1 or 1.33 14 14 13 11 15 28
Note: Link budget is calculated for the standard integrated WipLL antennas.
Where required, the range can be increased by the implementation of external
antennas.
2.6.3. Interference Analysis
Interference analysis should be based on parameters defined in Section 2.6.1, “Main
Technical Parameters” to determine the downlink and uplink carrier-to-interference
ratio (C/I). The C/I is a key factor in determining the supported modulation for each
link. Thresholds for C/I for the different modulations are mentioned in Section 2.6.1,
“Main Technical Parameters”.
Interference analysis depends on the duplex scheme implemented in the system.
Since WipLL supports both FDD and TDD, different considerations should be
applied.
2
Although the transmitter is capable of transmitting 27 dBm, in most cases the EiRP
in the ISM band is limited by local regulations. For example, ETSI limits the EiRP
to 20 dBm, FCC to 36 dBm, and TELEC to 27 dBm. The link budget calculated
here assumes no limit.