Software turns generators to TD-SCDMA

Two new software options from Rohde and Schwarz allow the R and S SMU200A, SMATE200A and SMJ100A signal generators to be used for TD-SCDMA testing.

Two new software options from Rohde and Schwarz allow the R and S SMU200A, SMATE200A and SMJ100A signal generators to be used for TD-SCDMA testing.

The standard is primarily used in China and Korea and by chip manufacturers in the USA.

TD-SCDMA uses a bitrate of 1.28Mbit/s and a bandwidth of 1.6MHz.

Together the two new options make it possible to generate test signals in real time for the 3GPP TDD LCR (low bitrate mode) version specified in accordance with 3GPP for transport and physical layers.

3GPP standard-compliant tests can thus be performed on modules, power amplifiers, digital baseband receiver chips as well as on RF receivers for mobile phones and basestations.

Both the 3GPP and the China Wireless Telecommunication Standard Group (CWTS) have specified TD-SCDMA.

Systems based on TD-SCDMA operate on the same frequencies in the uplink and downlink (time division duplex method).

To avoid interference, the basestation and the mobile phone must not transmit at the same time.

The basestation features a downlink pilot (Dw PTS) for co-ordinating the signals: The first timeslot is always reserved for the downlink, the second for the uplink.

The other timeslots are administered by the network - as a function of the data volume to be transmitted - by shifting the switching point for the uplink and downlink.

R and S SMx-K50 uses the integrated arbitrary waveform generator to simulate up to four TD-SCDMA cells in the uplink and the downlink.

The switching point for the uplink and downlink can be flexibly set.

In the physical layer, the user can generate all channels defined in the standard.

In addition, the slot format, spreading factor, spread code and useful data can be specified for each code channel.

In combination with the R and S SMx-K51 option, the functionality is expanded: Users can thus generate PCCPCH and some DPCH signals in real-time.

The signal generators also offer channel coding for all reference measurement channels (RMC, 12.2 to 2048Kbit/s) defined in the standard and for the BCH.

Furthermore, HSDPA channels can be simulated and the channels for HSDPA RMCs (H-RMC 526 and 730Kbit/s) can be coded.

The new options run on the three signal generators of the R and S SMx family.

The R and S SMU200A, with optionally up to two paths and integrated fading simulator, is ideal for development, while the R and S SMATE200A as an automatic test equipment (ATE) version with very fast setting times is designed for production.

The R and S SMJ100A, featuring good signal quality and a flexible baseband, is a general-purpose instrument that can be used in development as well as production.

The TD-SCDMA package from Rohde and Schwarz is rounded out by tried-and-tested spectrum analysis solutions.

The R and S FS-K76 and FS-K77 options for the R and S FSQ, FSU and FSP spectrum analysers allow users to define the code domain power for different channels.

Their functionality includes the most important measurements on user equipment such as code domain power versus time, transmission power, adjacent channel power and frequency output mask.

The new R and S SMx-K50 and SMx-K51 software options are now available from Rohde and Schwarz.

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