Infinet Wireless: Technical Documentation
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The "Radio Settings" contains radio settings, which should be configured to establish wireless connection.

Radio settings are divided into following categories:

Radio frontend

ParameterDescription
Unit role

One of the link units must be set to Master and the other one to Slave.

At the link setup phase the following parameters must be set to the same value on Master unit and Slave unit:

  • Center frequency - it may be set by two ways:
    • Manually via "Downlink center frequency" and "Uplink center frequency" parameters. In this case wireless link will be setup at once.
    • Automatically with "Automatic selection of center frequency" function. In this case frequency channel grids must be set on both units. At the initial phase Master unit will select its center frequency automatically from grid, after that Slave unit will scan frequencies from its grid and wireless link will be setup when Slave find the center frequency which Master operates on.
  • Channel width - should be set manually on both units.

When a wireless link is established Slave unit will continuously inherit radio frontend parameters from Master unit excluding frequency channel grids. So, if you change some values on Master they will be set on Slave automatically.

Automatic selection of center frequency

There are several approaches to define center frequencies in Quanta 5:

  • Frequency selection off - center frequency will be set manually.
  • Instant DFS and radar detection - center frequency will be set automatically according to frequency channel grids. In this mode Master unit will switch to the different frequency if high level interference or radar will be detected. Slave unit will switch too at the same time.
  • Instant DFS - center frequency will be set automatically according to frequency channel grids. In this mode Master unit will switch to the different frequency only if high level interference will be detected with no matter the type of interference source. Slave unit will be switched too at the same time.
Independent UL/DL center frequencies

Units may transmit on diffrerent center frequencies.

  • Enabled - uplink and downlink frequencies can be set to different values.
  • Disabled - uplink and downlink frequencies will be the same.
Power limit

Power limit parameter limits the transmitter power, there are two modes:

  • Transmitter output power - limits the power of transmitter to the set value.
  • EIRP - limits the total system power calculated as:
Tx Power + Antenna gain + Cable loss
Radio frontend settings description

Figure - Radio frontend settings

Air frame

ParameterDescription
Channel width

Channel width, shoud be the same on both Master and Slave units.

Frame period

Frame period affects the following wireless link metrics:

  • The greater frame period the more payload will be transmitted in one frame. Greater values increase latency.
  • The lower frame period the less payload will be transmitted in one frame. Lower values decrease latency.

Please note that frame period value is strongly depends on interference conditions. If larger frames will be dropped then larger payload is lost and system performance is decreased significantly. If smaller frames will be dropped then smaller payload is lost and system performance is decreased not so significantly.

Guard interval

Guard interval is intended for intersymbol interference elimination. One of the causes of intersymbol interference is multipath propagation in which a wireless signal from a transmitter reaches the receiver via multiple paths. Guard interval affects payload size. So it should be increased only in case of intersymbol interference.

Uplink/Downlink ratio

Allows to configure quotes for uplink and downlink directions. Available values depend from:

  • Channel width.
  • Frame period.
Air frame settings description

Figure - Air frame settings

Automatic modulation and transmit power control

ParameterDescription
AMC strategy

There are folowing AMC strategies are available:

  • Normal - represents a balance between the error rate and throughput values.
  • Conservative - assumes using higher CINR thresholds in order to minimize the error rate.
  • Agressive - lowers the thresholds in order to use higher modulation levels and thus increase the throughput.
Automatic transmit power control

ATPC allows to automatically control transmitter output power. Each unit has its own target RSSI level value calculated automatically. If actual RSSI level is lower then unit increases transmitter output power of the ewmote unit and vice versa. ATPC could not set value that may exceed the "Power limit" value.

  • The Master unit manages the transmit power of Slave unit.
  • The Slave unit manages the transmit power of Master unit.
AMC and ATPC settings description

Figure - AMC and ATPC settings

Frequency channel grids

Each available channel width connected with appropriate channel grid. Grid is used for automatic selection of center frequency function and contains a list of frequencies can be switched to. In the example below you may see that wireless unit with enabled "Automatic selection of center frequency" may change center frequency to the following values (MHz): 5100, 5120, 5140, 5300, 5390, 5410.

5100-5140/20, 5300, 5390-5410/20

Each element of list may be set as follows:

  • 5300 - exact value;
  • 5100-5140/20, 5390-5410/20 - range of values with 20 MHz step, step always must correspond to channel width.


Figure - Frequency channel grids
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