Specifications

ETSI
Final draft ETSI EN 300 328 V1.8.1 (2012
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04)
76
EXAMPLE 2: However, if the product has transmit power levels different for IEEE 802.11™ [i.3] vs. HT20
operation, then worst-case modulation type should be identified and used for testing the e.i.r.p. and
e.i.r.p. density which need to be repeated for both IEEE 802.11™ [i.3] and HT20 operation.
e.i.r.p. and e.i.r.p. density conformance tests should be repeated using the worst-case
IEEE 802.11™ [i.3] and HT20 modes, respectively. In this case three sets of e.i.r.p. and e.i.r.p.
density conformance testing should be performed:
- Worst-case IEEE 802.11™ [i.3] modulation.
- Worst-case HT20 modulation.
- Worst-case HT40 modulation.
NOTE: In some operating modes, the CSD feature may be disabled. Comparison testing between CSD enabled
and CSD disabled will determine the worse-case configuration, and this configuration will then be used
during the conformance testing.
D.3 Possible Operating Modes
Listed below are the most common operating states of multiple transmit/receive chains within Smart Antenna Systems:
• Beamforming feature implemented and enabled or disabled.
• All available transmit and receive chains enabled.
• A subset of the present transmit/receive chains temporarily disabled during normal operation (i.e. dynamically,
based on link conditions or power requirements). In this case, a vendor may implement higher transmit power
settings (dynamically) for the active transmit chains.
• Although not commonly expected, it is possible that an equipment may utilize different transmit power
settings between one or more of the present transmit chains.
D.3.1 Guidance for Testing
e.i.r.p. and e.i.r.p. density tests should be repeated using the worst-case Modulations described above and in the
following operating states when supported by the equipment:
• Where one or more of the transmit chains is manually or automatically disabled during normal operation and
different target RF output power levels are used depending on the number of active transmit chains, then
e.i.r.p. and e.i.r.p. density conformance testing should be performed using each configuration:
- For example, an equipment with three transmit chains may support an operating mode using three
transmit chains at one power level and another operating mode in which one transmit chain is using a
higher power level while the other transmit chains are disabled. e.i.r.p. and e.i.r.p. density conformance
testing should be repeated (using the worst-case modulation types described above) for both of the above
mentioned (three-transmit and single-transmit) operating modes.
- For example, an equipment with three transmit chains which does not change its (per transmit chain) RF
output power based on the number of active chains, need not undergo repeat testing for all the transmit
chains.
• Where a beamforming feature is implemented, conformance testing should be performed as indicated for an
equipment with a beamforming feature:
- Where the beamforming feature may be disabled manually or automatically, conformance testing does
not need to be repeated if the (per transmit chain) RF output power settings remain unchanged.
- Where the beamforming feature may be disabled manually or automatically, conformance testing needs
to be repeated if different (per transmit chain) RF output power settings will be used.