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Janne Aitta
22.01.2006
TEST SPECIFICATION
WLAN TX CPK
OFDM modulation scheme
Owner (Function):
Responsible person:
Approver:
Filename:
MP / HW / NCW
Janne Aitta
WLAN_TX_CPK_OFDM.doc
Change History
Version
Status
Date
Responsible person
Comments
0. Test Classification
01.
Proposal
22-Jan-2006
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Feature Group = NCW features
Feature = WLAN
Sub-Feature = TX
HW Test Type = Performance
Execution -Type = ATE
1. PURPOSE
Purpose of WLAN Cpk test is to get statistically significant amount of data to
1) evaluate the performance of the transceiver conform to requirements
2) find out design parameters that may cause problem in mass production.
Conformance is required for WLAN qualification of the product.
The following parameters are to be measured:
Transmit output power
Transmit spectrum mask
Symbol clock and Transmit center frequency tolerance
Transmit power-on and power-down ramp
Transmit modulation accuracy, EVM
Transmit center frequency leakage
Transmit spectral flatness
Maximum spectral power density
Frequency range
6dB bandwidth
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2. ORIGINAL REQUIREMENT & REFERENCES
2.1
Transmit output power
The typical conducted transmit output power requirement for different data rates is shown in table
2.1.
Datarate [Mb/s]
6, 9, 12, 18,
24, 36, 48, 54
Power [dBm]
Tolerance [dB]
13
+/-1
Table 2.1 Transmit output power for different datarates
Note:
The equivalent isotropic radiated power shall be equal to or less than 20dBm (100 mW) e.i.r.p.
The e.i.r.p. shall be calculated as follows:
P=A+G
Where
P = equivalent isotropic radiated power
A = measured conducted output power
G = measured antenna gain (given by the manufacturer)
2.2
Transmit spectrum mask
The transmitted spectrum shall have a 0 dBr (dB relative to the maximum spectral density of the
signal) bandwidth not exceeding 18 MHz, –20 dBr at 11 MHz frequency offset, –28 dBr at 20 MHz
frequency offset and –40 dBr at 30 MHz frequency offset and above. The transmitted spectral
density of the transmitted signal shall fall within the spectral mask, as shown in Figure 2-1. The
measurements shall be made using a 100 kHz resolution bandwidth and a 30 kHz video
bandwidth.
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Figure 2-1 Transmit spectrum mask
2.3
Symbol clock and Transmit center frequency tolerance
The transmitted center frequency tolerance shall be ±25 ppm maximum. It is determined by
measuring symbol clock frequency error.
2.4
Transmit power-on and power-down ramp
The transmit power-on ramp for 10% to 90% of maximum power shall be no greater than 2 us.
The transmit power-on ramp is shown in Figure 2-2.
The transmit power-down ramp for 90% to 10% maximum power shall be no greater than 2 us.
The transmit power-down ramp is shown in Figure 2-3.
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Figure 2-2 Transmit power-on ramp
Figure 2-3 Transmit power-down ramp
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Transmit modulation accuracy, EVM
The relative constellation RMS error, averaged over subcarriers, OFDM frames, and packets,
shall not exceed a data-rate dependent value according to Table 2.2.
Datarate
[Mb/s]
6
9
12
18
24
36
48
54
EVM
[dB]
-5
-8
-10
-13
-16
-19
-22
-25
Table 2.2 Allowed relative constellation error versus data rate
2.6
Transmit center frequency leakage
Certain transmitter implementations may cause leakage of the center frequency component. Such
leakage (which manifests itself in a receiver as energy in the center frequency component) shall
not exceed -15 dB relative to overall transmitted power or, equivalently, +2 dB relative to the
average energy of the rest of the subcarriers. The data for this test shall be derived from the
channel estimation phase. Transmit center frequency leakage is determined by measuring IQ
offset.
2.7
Transmit spectral flatness
The average energy of the constellations in each of the spectral lines –16…–1 and +1…+16 will
deviate no more than ± 2 dB from their average energy. The average energy of the constellations
in each of the spectral lines –26…–17 and +17…+26 will deviate no more than +2/–4 dB from the
average energy of spectral lines –16…–1 and +1…+16. The data for this test shall be derived
from the channel estimation step.
2.8
Maximum spectral power density
The maximum spectral power density is defined as the highest level of power in Watts per Hertz
generated by the transmitter within the power envelope.
The maximum spectrum power density is limited to 10dBm (10 mW) per MHz e.i.r.p
The e.i.r.p. shall be calculated as follows:
PD = A + G
Where
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PD = the maximum spectral power density e.i.r.p.
A = measured conducted maximum spectral power density
G = measured antenna gain (given by the manufacturer)
2.9
Frequency range
The frequency range of the equipment is determined by the lowest and highest frequencies
occupied by the power envelope.
fH is the highest frequency of the power envelope: it is the frequency furthest above the frequency
of maximum power where the output power drops below the level of -80 dBm/Hz e.i.r.p. spectral
power density (-30 dBm if measured in a 100 kHz bandwidth).
fL is the lowest frequency of the power envelope; it is the frequency furthest below the frequency
of maximum power where the output power drops below the level equivalent to -80 dBm/Hz e.i.r.p.
spectral power density (or -30 dBm if measured in a 100 kHz bandwidth).
The frequency range is determined by the lowest value of fL and the highest value of fH resulting
from the adjustment of the equipment to the lowest and highest operating frequencies.
The frequency range shall lie within the band 2,4 GHz to 2,4835 GHz (fL > 2,4 GHz and fH <
2,4835 GHz).
2.10
6dB bandwidth
The minimum 6 dB bandwidth shall be at least 500 kHz.
3. EQUIPMENT
Dongle Nokia PKD-1RD
Power supply for Mobile (0 - 500V; 3A) Agilent E36xx or RS NGMO2
WLAN test equipment Agilent N4010A
Temperatur chamber VT 4002
Shielded Box MSE Box V3 , Manufacturer: Delta
FBUS cable DAU9-T
Battery dummy (JIG)
4. VARIABLE CONDITIONS AND PARAMETERS
4.1
Imported Test Director Parameters and Fields:
4.1.1 Parameters
N/A
4.1.2 Fields
<<Network>>
<<Phone_Mode>>
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<<HWID>>
<<PSN>>
<<SW Version>>
4.2
Exported Test Director Parameters and Fields
4.2.1 Parameters
N/A
4.2.2 Fields
<<Temperature>>
<<Samples>>
(recommendet temp. values)
(recommended no. of samples to test)
5. FIXED CONDITIONS AND PARAMETERS
Amount of phones
to be measured:
Depending on build. >10 if Cpk calculation will be made.
Supply Voltage:
Channels:
Power levels:
Temperatures:
3.3V, 3.8V, 4.3V
Low, mid, high (1, 7, 13)
As defined in test cases
-10, +25, +55
6. DESCRIPTION OF TEST
Test procedure depends on the test system implementation. See next chapter.
7. TEST AUTOMATION
Test automation is recommended. The actual test system to be used is not specified here while
not harmonized in Nokia. Therefore it is only presumed the test is performed by means of some
kind of automated test system. Cpk value calculation is not mandatory.
8.
TEST LIMITS
See Section 2
9. JUSTIFICATION FOR TEST LIMITS
Limits are taken from the current WLAN specification (IEEE802.11a-1999, IEEE802.11g-2003),
ETSI specification (EN 300 328 V1.6.1) and FCC specification (FCC 15.247).
10.
APPROVAL CRITERIA
The test is passed if the results are within the defined limits fulfilling specified distribution
model.
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10.1
Test Case Version Info: v01.
10.2
Generic configuration information to be reported (defined test director fields):
(If test director fields exist, filling these values here is optional. Filling them to testdirector is
mandatory.)
HWID
SNR
____
____
Phone
Mode
____
Vbat
____
Network:
Band
____
SW
______
10.3
Other configuration information to be reported (test case specific):
10.4
Data to be stored:
Example results for Cpk measurement data is represented in the excel sheet below:
WLAN_TX_Cpk_data
_OFDM.xls
Example results for Cpk value table is represented in the excel sheet below:
WLAN_TX_Cpk_valu
e_OFDM.xls