Signal Routing and System Configuration
R&S
®
SMW200A
128User Manual 1175.6632.02 ─ 16
For any allowed system configuration, the R&S SMW configures the signal flow
automatically upon just four parameters:
– Number of entities (users or cells)
– Number of Tx and Rx antennas
– The decision whether coupled or separated baseband sources are used
– Kind of generated signals, analog, digital, or multiplexed digital signals.
In this way, within one dialog you can configure complex configurations with:
– Up to 8 Tx or Rx antennas
– Up to four standalone 2x2 MIMO systems, e.g. 8x2 MIMO or LTE-A Carrier
Aggregation with 2x2 MIMO
– Up to 8 SISO systems
See also Table 3-1.
For any selected fading and baseband configuration, the dialog displays on-the-fly a
simplified preview diagram of the signal routing. The selected configuration is applied
after executing the "Apply" function; the configuration influences the signal flow up to
the I/Q stream mapper.
Refer to Chapter 3.4, "System Configuration Settings", on page 137 for detailed
description of the provided settings.
Coupled or separate baseband sources
To simplify the configuration of the baseband signal in some MIMO test scenarios, you
can enable the R&S SMW to combine the available resources into a single baseband
block. The R&S SMW then generates the required number of Tx antennas out of it.
The configuration of the various Tx antennas is performed in a common dialog.
Depending on the currently selected baseband source, in particular when using cou-
pled or coupled per entity basebands, not all digital standards are available. Coupled
mode is supported by the "EUTRA/LTE" and "IEEE802.11 WLAN" digital standards,
enabled in the "ARB" and with an external digital baseband signal.
●
Advantages of the coupled baseband sources
Using coupled baseband sources is advantageous in complex test scenarios and
enabled if a scenario requires the signal of more than one cell, Tx antenna or
entity.
In coupled mode, the instrument takes over the baseband signal configuration,
adjusts the settings of all required basebands/entities automatically, and applies
suitable trigger settings.
Coupling external digital baseband signals accelerates the configuration and pro-
vides better overview by combining the settings within one central dialog.
●
Separate baseband sources
Separate baseband sources have to be used in test scenarios involving:
– A mixture of internally generated and externally supplied baseband signals
– A mixture of internally generated signals according to different digital stand-
ards.
Possible Ways to Configure the Signal Flow
To Next Page
Loading...
