Auto-detect (from "----") (802.16 OFDMA)
: Cleared (See OFDMA Standard Presets Table.)
sets the VSA to Automatic Zone Definition detection mode. When Definition Source mode is selected, the VSA will automatically determine the downlink and uplink zone definitions for the current measurement and auto-configure the basic VSA setup parameters. The VSA also provides what signal data was used to auto-detect the zone definition in the "(from "----") part of the properrty. With this feature, the VSA can measure an IEEE Institute of Electrical and Electronics Engineers. A US-based membership organisation that includes engineers, scientists, and students in electronics and related fields. The IEEE developed the 802 series wired and wireless LAN standards. Visit the IEEE at http://www.ieee.org 802.16 OFDMA standard based signal without prior knowledge of the zone definition configuration. Uplink and Downlink subframe auto-detection modes are implemented differently and provide different data result capabilities.
Downlink Auto-detect Zone Definition mode:
To setup the VSA to perform Downlink Auto Zone Definition mode analysis, you must configure some fundamental IEEE 802.16 OFDMA signal format parameters, set the VSA to downlink analysis mode, and then set the VSA to Definition Source mode. Do the following steps to configure the VSA and start the analysis:
- Configure the signal format parameters:
- Specify the and parameters on the tab. Use Preset to Standard if your signal is an IEEE 802.16 OFDMA standards compliant signal to auto-configure the VSA.
- Specify the on the tab. To auto-detect the preamble index value, use the Preamble Index Detector Macro.
- Set the VSA to Downlink Subframe Type on the tab.
- Set the VSA to Definition Source mode on the tab. When is selected, the VSA will disable (grey) many of the setup parameters including the Subchannel Group Bitmask and Downlink Frame Ratio parameters on the tab.
Definition Source mode will auto-configure the downlink subframe and uplink subframe zone definitions for the current downlink measurement based on the decoded FCH, DL-MAP downlink map: A MAC message that defines burst start time for both time division multiplex and time division multiple access (TDMA) by a subscriber station (SS) on the downlink., and UL Up Link (reverse link: from cell phone to base station)-MAP messages of the downlink subframe. The downlink Definition Source mode uses the Decode DLMAP and Decode ULMAP features to determine the downlink and uplink zone definitions ( mode selects the and properties in the Decoding region on the tab). The downlink auto-configured zone definitions can be saved to a map file and recalled at a later time for additional signal analysis.
Individual bursts cannot be analyzed in the Definition Source mode. To analyze individual bursts, change the Definition Source mode to
The auto-decoded DL Down Link (forward link: from base station to cell phone)-MAP and UL-MAP information can be viewed in the DLMAP Info and ULMAP Info traces respectively.
Auto-detect Zone Definition Parameters:
- Zone Number
- Save Map File
|
: |
For multiple-zone signals, selects which zone described in the DLMAP will be analyzed. When a zone index is specified that is greater than the number of zones defined in the DL-MAP, the last zone described in the DLMAP will be used. Since the DL-MAP can change on every measurement, this will occur without limiting the parameter. The performs the same function as selecting a zone on the Active Zone dropdown list for a Map File.
|
|
|
(downlink only) When is selected, the property saves the autodecoded map file to disk. The VSA creates an auto-generated file name for the map file which is shown in the Map File - drop-down list. The default map file name will start with "auto-", followed with the date and a unique numeric identifier. The message "(from setup)" will append the name to indicate that the measurement map file is from the auto-configured setup information and that the decoded map file has not been saved. Select to save the Map File to disk, the "(from setup)" message will be removed after the file has been saved. The operation does not update and save the auto-decoded and parameters. Therefore, these parameter settings may need to be re-specified when using a recalled map file that was saved with the property. is not active untilis selected and the measurement is paused. |
Uplink Auto-detect Zone Definition mode:
To setup the VSA to perform Uplink Auto-detect Definition Source mode analysis, set the VSA to analysis (tab > Uplink in Subframe Type) and then to Auto-detect mode ( tab > Auto-Detect (from "---") in Definition Source).
The uplink signal does not provide MAP information, so the VSA statistically evaluates the subframe to determine the permutation base and burst geometry for some basic uplink permutation zone types. Zone Definition mode only supports the permutation zone type.
The VSA does provide uplink zone type and other data burst information in the trace. The VSA can auto-detect Uplink Data Bursts, FFB bursts and CDMA Code Division Multiple Access: One of several digital wireless transmission methods in which signals are encoded using a specific pseudo-random sequence, or code, to define a communication channel. A receiver, knowing the code, can use it to decode the received signal in the presence of other signals in the channel. This is one of several "spread spectrum" techniques, which allows multiple users to share the same radio frequency spectrum by assigning each active user an unique code. CDMA offers improved spectral efficiency over analog transmission in that it allows for greater frequency reuse. Other characteristics of CDMA systems reduce dropped calls, increase battery life and offer more secure transmission. See also IS-95. bursts. The FFB bursts are analyzed as a data burst and the modulation type, burst size, and power results are provided. The VSA can also detect CDMA bursts and provide the CDMA codes, power, and data region information.
See Also
Zone Definition Tab (802.16 OFDMA)
