Solectek SkyWay-Excel Series User Manual page 25

Modulation Used to establish the transmit modulation and FEC rate of the OFDM/MIMO radio.
The higher the modulation setting (or "density"), the higher the link data rate, but the lower the
receive sensitivity.
From lowest to highest data rates, the available modulation/FEC settings are:
BPSK- ½
•
QPSK- ½
•
QPSK- ¾
•
QAM16- ½
•
QAM16- ¾
•
QAM64- ⅔
•
QAM64- ¾
•
AUTO
•
From the above screen on the Master unit, Tx/Rx modulations for each client can be set
individually. The values can be a specific modulation type or AUTO, using the ACM feature
shown below.
Adaptive Coding and Modulation (ACM) The AUTO setting above will enable the ACM
function in the network. This feature allows the system to determine the best TX modulation and
MIMO settings based on current RF conditions. At power-up (or reset), the ACM function will
begin operation at the most robust modulation and MIMO settings (BPSK-1/2, 1 stream). If link
conditions warrant, higher order settings will be tested and selected for use.
The ACM function operates continuously, i.e. – if RF link conditions change, then the
modulation and MIMO settings will respond in order to maximize link capability without
compromising reliability.
The system relies upon user traffic to determine the optimal modulation settings. When ACM is
enabled, user traffic must be available in order to bring link performance up to its maximum
capability.
Modulation
QAM64
QAM16
QPSK, BPSK
Max Output Power
17 dBm
20 dBm
23 dBm
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