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| title | Figure - Radio frontend settings |
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Air frame
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| title | Air frame settings description |
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| | Parameter | Description |
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| Channel width | Channel width, shoud be the same on both Master and Slave units. | | Frame length | 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 the larger payload is lost and system performance is decreased significantly. If smaller frames will be dropped the smaller payload is lost. | | Guard interval | Guard interval is intended for intersymbol interference elimination. One of the intersymbol interference reasons 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 significant intersymbol interference. | | Uplink/Downlink ratio | Allows to configure quotes for uplink and downlink directions. Available values depend from: - Channel width.
- Frame period.
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| title | Figure - Air frame settings |
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Automatic modulation and transmit power control
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| title | AMC and ATPC settings description |
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| | Parameter | Description |
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| AMC strategy | There are folowing AMC strategies 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 control transmitter output power automatically based on target RSSI value. If actual RSSI level is lower then unit increases transmitter output power of the remote 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.
| | Target RSSI | RSSI value which will be used by ATPC as target. |
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| title | Figure - AMC and ATPC settings |
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Frequency channel grids
Each available channel width is connected with appropriate channel grid. Grid is used for automatic center frequency selection function and contains a list of frequencies that may be selected. In the example below you may see that wireless unit with enabled "Automatic center frequency selection" may change center frequency to the following values (MHz): 5100, 5120, 5140, 5300, 5390, 5410.
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| 5100-5140/20, 5300, 5390-5410/20 |
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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.
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| title | Figure - Frequency channel grids |
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