Anritsu 3GPP, Руководство по измерениям

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6-5 TD-LTE Over-the-Air (OTA) Measurements TD-LTE Signal Analyzer
6-18 PN: 10580-00234 Rev. Y 3GPP MG
Tx Test
Tx Test measurements are optimized for remote radio heads and MIMO systems. The first
table in Tx Test replicates the Scanner table measurements, except the measurement scans
the presence of up to 3 cell IDs. The second table shows the RS power across all detected
antennas (transmitters) for the strongest Cell ID. This is displayed as average power and
delta power for the detected transmitters, along with a small bar graph that shows the
relative RS powers for each Tx. The PBCH Modulation Results table can also be turned on.
Mapping (Coverage Mapping)
Coverage Mapping allows users to measure and map Sync Signal Power, Reference Signal
Received Power (RSRP), Reference Signal Receive Quality (RSRQ) and SINR. It is the same
measurement as in Scanner which scans for the presence of up to 6 cell IDs but only displays
the presence of up to 3 cell IDs. For full details regarding Coverage Mapping setup and
testing, refer to
Chapter 7, “LTE and TD-LTE Coverage Mapping” .
Carrier Aggregation
This measurement displays a table of up to five Component Carriers (CC) used in Carrier
Aggregation and their measured signal components.
Frequency
This is the set center frequency.
Bandwidth (BW)
This is the set bandwidth of the Component Carrier.
Cyclic Prefix (CP)
The length of Cyclic Prefix can be specified as either Normal or Extended.
MIMO
Multiple input, multiple output technology, or spatial multiplexing, uses two or more
simultaneous RF transmission paths to improve signal performance. In 2x2 MIMO, for
example, the overall bitrate increases through transmission of different data streams from
two TX antennas to two RX antennas on the same frequency and time, but different reference
signals. Your Anritsu test instrument supports 2x2 and 4x4 MIMO configurations. Note that
4x4 MIMO may not be available if your instrument is loaded with older firmware. Refer to
your instrument User Guide for instructions on updating firmware.
The MIMO status indicators show which transmitters are active in a MIMO configuration.
Active transmitters display as a green dot, inactive as gray. They correspond to the antenna
icons shown at the bottom left of the screen for each Component Carrier scanned.
Reference Signal (RS) Power
Reference Signal power is displayed in dBm or Watts. The reference signal is used for
downlink channel estimation.
RS Delta Power
RS Delta Power shows the maximum relative power difference in dB between the RS powers
of the MIMO signals and can be used to check correct MIMO configuration.
Sync Signal (SS) Power