Data Burst Info (802.16 OFDMA)
(Data Burst Analysis mode only)
trace data shows summary data for the active Data Bursts for the Zone that is currently being analyzed. The trace only reflects information for the data bursts that are analyzed. When or Definition Source mode is used, the set of bursts to be analyzed is user-selectable, see the Zone Definition tab for more information about selecting data bursts for analysis. When Auto-detect Definition Source mode is used, all detected bursts are analyzed. The trace provides the following results
Zone Information:
- Permutation Zone Type: The first entry shows the measurement permutation zone type.
- PermBase: The measurement Permutation Base number.
Data Burst Information:
- DataBurst name of the data burst (data region) being analyzed.
- ModFmt data burst modulation format. For uplink zones, includes annotation of collaborative spatial multiplexing pilot pattern (if applicable.)
- Size(slots) number of slots that define the bursts data region.
- Boost(dB): the RMS per-data-subcarrier power of each downlink burst relative to the nonboosted power reference.
- DPwr(dB): When is selected, is the absolute RMS per-data-subcarrier power of each data burst (in dBm deciBels referenced to a milliWatt: dB relative to 1 milliwatt dissipated in the nominal input impedance of the analyzer).
- DTotPwr(dB): When is cleared, is the absolute RMS power of the data subcarriers associated with the data burst, averaged over the zone length.
- PPwr(dBm): When is selected, is absolute RMS per-pilot-subcarrier power of each data burst (in dBm).
- PTotPwr(dBm): When is cleared, PTotPwr(dB) is the absolute RMS power of the pilot-subcarriers associated with the data burst, averaged over the zone length (in dBm).
- Pwr(dBm): the absolute average per-subcarrier nonboosted power level.
- TotalPwr(dBm)the total power of a data burst per slot. When the data burst has an equal number of active subchannels in each slot, is equal to the following equations:
:
TotalPwr(dBm) = DPwr(dBm) + 10*Log(NumBurstDataSubcarriers)
:
TotalPwr(dBm) = 10*Log((NumBurstDataSubcarriers / NumBurstSubcarriers) *
(10^(DPwr(dBm)/10)) + (NumBurstPilotSubcarriers / NumBurstSubcarriers) *
(10^(DPwr(dBm)/10))):
TotalDataPwr(dBm) = DPwr(dBm) + 10*Log(NumBurstDataSubcarriers)
:
TotalPilotPwr(dBm) = PPwr(dBm) + 10*Log(NumBurstPilotSubcarriers)
where:
- NumBurstDataSubcarriers Number of active data subcarriers in the data burst.
- NumBurstSubcarriers Number of active subcarriers in the data burst (both pilot and data subcarriers.)
- NumBurstPilotSubcarriers Number of active pilot subcarriers in the data burst.
- RCE Relative Constellation Error is the RMS level of the Error Vector Magnitude, averaged over all subcarriers and all detected OFDM symbols.(dB) The RMS level of the Error Vector Magnitude, averaged over all subcarriers and all detected OFDMA symbols for the defined data burst.
- DataRCE(dB): The same as RCE(dB), but excludes the pilot
subcarriers. DataRCE(dB) is necessary since measuring data bursts with few allocated
subchannels leads to an RCE dominated by pilot subcarrier RCE. DataRCE(dB) does not include
"common" pilots that are not specifically associated with the data burst.
The DataRCE(dB) and RCE(dB) results will be identical for zone types where the pilot subcarriers are not associated with specific subchannels (i.e. DL Down Link (forward link: from base station to cell phone)-PUSC partial usage of subchannels: Some of the subchannels are allocated to the transmitter., DL-FUSC full usage of subchannels: All of the subchannels are allocated to the transmitter., DL-OFUSC). In all other zone types, where the data burst-are associated with specific subchannels (i.e. all Uplink zone types, and DL-AMC Adaptive Modulation and Coding)associated pilot subcarriers, the RCE and DataRCE results are unique. The RCE(dB) result will include pilot subcarriers that are not included in the DataRCE(dB).
When the VSA is set to Zone Definition mode; the auto-detected FFB burst is analyzed as a data burst.
Uplink CDMA Burst Data Results
For analysis, defined or auto-detected 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. regions are analyzed and the following information is provided on the trace:
- CDMA: Number of active CDMA codes detected
- Code power Pwr(dBm): Total measured power of all active subcarriers of the CDMA code
- Code len: Number of contiguous active OFDM Orthogonal Frequency Division Multiplexing: OFDM employs multiple overlapping radio frequency carriers, each operating at a carefully chosen frequency that is Orthogonal to the others, to produce a transmission scheme that supports higher bit rates due to parallel channel operation. OFDM is an alternative tranmission scheme to DSSS and FHSS. symbols occupied by this CDMA code
- Code Subch: Index of the first subchannel occupied by this CDMA code
- Code Sym: Index of the first symbol occupied by this CDMA code
CDMA region analysis is only performed in UL Up Link (reverse link: from cell phone to base station)-PUSC zone types. In UL-AMC and UL-OPUSC, CDMA regions are not analyzed.
Additional signal qualty metrics
For additional EVM Error vector magnitude (EVM): A quality metric in digital communication systems. See the EVM metric in the Error Summary Table topic in each demodulator for more information on how EVM is calculated for that modulation format. and RCE metrics see the following summary tables:
Frame Summary Table
Available Summary Data Table
See Also
