Electronic Measuring Electronics Catalog 2013 - page 441

441
Transmitter Spectral Flatness
IEEE Std 802.11n-2009 (20.3.21.2)
Definition
Graphical display of RF sub-carrier power level
Display includes limit lines (as per 20.3.21.2)
Overall Pass/ Fail status indicated
For measurement failure, a numeric measurement result of the failing subcarrier(s) is reported
Unit of Measurement
dBr
Transmitter Modulation Accuracy
IEEE Std 802.11n-2009 (20.3.21.7.3/20.3.21.7.4)
Definition
Peak and Average EVM. Measurement averaged over a fully coded HT OFDM packet with minimum payload
length of 16 symbols (64 μs)
Measurement Accuracy
2.4 GHz frequency band
20 MHz channel b/w: (72.2 Mbps, +18 to –45 dBm)
<2% residual RMS EVM
40 MHz channel b/w: (150 Mbps, +16 to –45 dBm)
<2% residual RMS EVM
5 GHz frequency band
20 MHz channel b/w: (72.2 Mbps, +18 to –45 dBm)
<2.3% residual RMS EVM (typical <2%)
40 MHz channel b/w: (150 Mbps, +16 to –45 dBm)
<2.3% residual RMS EVM (typical <2%)
Modulation Settings
PPDU Format: HT-Mixed Mode, HT-Greenfield
PPDU Type: 20 MHz, 40 MHz, 40 MHz Upper, 40 MHz Lower, 40 MHz Duplicate
Modulation & Coding Scheme: MCS Index 0 to 7 and MCS 32 (Duplicate)
Guard Interval
HT-Mixed Mode: Long (800 ns), Short (400 ns)
HT-Greenfield: Long (800 ns) only
Data Output Format
Peak and Average EVM pilots only, dB or percentage
Peak and Average EVM on each sub carrier (frequency domain), % vs sub-carrier –26 to +26
EVM vs Symbol (time domain), % vs symbol number, 1 to specified analysis length
Measurement Configuration
Analysis Length
16 to 500 symbols (default 40 symbols)
OFDM Pilot Tracking
User selection of Phase tracking only or Phase and Amplitude tracking (default Phase tracking only)
Channel Estimation
User selection of Long Training Sequence or Full Packet (default Long Training Sequence)
Receiver Minimum Input Sensitivity
IEEE Std 802.11n-2009 (20.3.22.1)
Definition
Packet Error Rate (PER) at defined power level
Power Range
–20 to –100 dBm at MT8860C test port
Mode
Direct: MT8860C transmits defined number of packets
Data Packet Structure
Complies with 802.11 specifications for MAC header formatting, scrambling, encoding, interleaving and calculation
of the appropriate CRC/FCS checksum
Number of Transmitted Packets
1 to 10,000 (default 500)
Payload Length
50 to 1772 bytes
Data Rates
20 MHz channel b/w: 6.5, 7.2, 13, 14.4, 19.5, 21.7, 26, 28.9, 39, 43.3, 52, 57.8, 58.5, 65, 72.2 Mbps
40 MHz channel b/w: 6, 6.7, 13.5, 15, 27, 30, 40.5, 54, 60, 81, 90, 108, 120, 121.5, 135, 150 Mbps
Direct Mode Settings
Inter-packet Spacing
10 µs to 1000 µs
DUT MAC Address range
Valid Unicast MAC address only. Broadcast and Multicast MAC addresses not supported.
Receiver Adjacent Channel Rejection
Receiver Non-adjacent Channel
Rejection
IEEE Std 802.11n-2009 (20.3.22.2)
IEEE Std 802.11n-2009 (20.3.22.3)
Definition
Adjacent Channel measurements made with external modulation signal source (e.g., MG3700A) using external
interferer port
Receiver Maximum Input Level
IEEE Std 802.11n-2009 (20.3.22.4)
Definition
Receiver PER specification as for 20.3.22.1 (above)
Additional TX Measurements
CCDF
CCDF defined as percentage of samples against dB, where percentage of samples is normalized to the average
power in the gate, and dB is defined as the relative value of samples greater than the average
Measurement Scales
Y-axis, Log scale, fixed values of 100, 10, 1, 0.1, 0.01%
X-axis, dB scale, fixed values of 0 to 12 dB
Occupied Bandwidth (OBW)
Measures the frequency range within which the specified percentage power is contained
Occupied Bandwidth Percentage
1 to 99%
Power Spectral Density (PSD)
As per ETSI EN 300-328 (4.3.2/5.7.3). The maximum power measured in a 1 MHz bandwidth within the occupied
bandwidth of the signal
TX Measurement Controls
Averaging
1 to 1,000 (default 1)
Triggers
4 trigger sources are available; Free Run, RF, Video and External
In Network Mode operation, the RF trigger (rising edge) must be selected
Free Run
Continuous unsynchronised
RF Edge
RF triggering on rising or falling edge, detected at RF input
User set level
RF Edge Dynamic Range
+18 to –40 dBm average power with Input Level Range set to AUTO
Video
Video triggering on rising or falling edge, detected at IF
Continued on next page
i...,431,432,433,434,435,436,437,438,439,440 442,443,444,445,446,447,448,449,450,451,...840
Powered by FlippingBook