StreamCaster MIMO Radio User Manual
4/30/19
10017C000
Silvus Technologies Confidential
Page
77
•
Maximum Ground Speed
: This setting improves performance in high mobility scenarios where
the wireless channel may change rapidly. Setting this value to an unnecessarily high value may
have an impact as high as 25 percent on overall achievable throughput.
•
Burst Time
: The burst time determines the maximum amount of time each node is allowed to
transmit at once. A larger burst time will provide higher throughput at the cost of higher latency.
On the other hand, a smaller burst time will provide less latency at the cost of less throughput.
•
RTS Retries:
A node wishing to send data initiates the process by sending a request to send
message (RTS). The destination node replies with a clear to send (CTS) message. Any other node
that receives the RTS or CTS message will refrain from sending data for a given time. In larger
networks, there is a higher probability of collisions occurring when an RTS is sent out. This field
defines the number of retries before a packet is dropped. A lower value will result in faster
handoffs in mobile situations.
•
MCS
: Choose the modulation and coding scheme (MCS). If this is set as AUTO, the radio will
dynamically cycle between a subset of the modes depending on the quality of the link. This is
the recommended setting for most users and will provide the maximum data rate that the link
can support. The EXTENDED AUTO mode includes 64QAM rate modes on top of those included
in the AUTO mode.
below show the estimated UDP data rate and sensitivity for each MCS. This table
assumes a 20MHz bandwidth, 5000 meter link distance and 1600 byte fragmentation threshold.
•
Transmit Channels:
Allows user to Enable or Disable each channel on the radio for TX.
•
Receive Channels:
Allows user to Enable or Disable each channel on the radio for RX.
•
GI Mode:
This feature can be used to improve performance in environments where long delay
spread is present and causing intersymbol interference
(
https://en.wikipedia.org/wiki/Intersymbol_interference
). This setting allows the radio to vary
its Guard Interval (
https://en.wikipedia.org/wiki/Guard_interval
) to allow for longer delay
spread. When set to ‘Extended Auto –
GI’, the radio will choose between the regular GI, and the
user specified longer GI (Cyclic Prefix Length in the next setting) depending on channel
conditions.
•
Beamforming (SC4200/SC4400 Only):
Enable or disable TX Beamforming (Up to 2X increase in
range when enabled)
