R&S®SMIQ Vector Signal Generator
Digital signals of your choice
Special applications
- Bit error rate measurement (BER test)
- Power control tests
- Base station conformance testing (FDD) to 3GPP TS 25.141
- Mobile station receiver test to 3GPP TS25.101
- Maximum input power
- Adjacent channel selectivity
- Blocking characteristics
- Spurious response
- Intermodulation characteristics
- Spurious EMISSIONS
- Simulation in real life conditions with fading and noise
By using option R&S SMIQB21, bit error tests can be made with the R&S SMIQ. Therefore, the demodulated signal from the device under test is fed back to the R&S SMIQ.
R&S SMIQB45 and R&S SMIQB48 can be used to perform power control tests. The transmit power control is based on the closed loop principle. During a connection, the mobile measures the received power and the signal to interference ratio (SIR). To maintain a certain SIR, the mobile transmits power control bits to instruct the base station to increase or decrease the power.
The base station has to demodulate a dedicated channel transmitted by the signal generator in defined conditions. The block error rate (BLER) of the demodulated channel is measured. The specification does not define background signal scenarios. However, the R&S SMIQ can add a background signal to the desired signal if necessary, consisting of up to 50 additional mobiles.
The receiver tests for mobiles are similar to the base station tests, except that the signal parameters are different and that the tester must now generate downlink signals. For the desired 3GPP signal, downlink reference measurement channels are defined in the standard, similar to the uplink case. In some tests, the standard explicitly specifies an OCNS background for the desired signal. The different tests are:
With the fading options R&S SMIQB14/B15, fading scenarios with 12 propagation paths are possible. With both options, two correlated faded RF channels can also be generated.
With the option R&S SMIQB49 the three recommended fading scenarios - multipath, moving propagation and birth-death mode - are directly implemented, so that they are only one step away. The second step to a realistic scenario is the generation of noise and insertion of distortion with the option R&S SMIQB17. With these real life conditions, many tests can be made in a laboratory which would normally require expensive field tests.
Due to its versatility and signal quality, the R&S SMIQ is the ideal RF source for different applications.
