Multi-channel, multi-standard signals to 6 GHz from R&S vector generator

April 26, 2013 // By Graham Prophet
Rohde & Schwarz has introduced the SMW200A high-end vector signal generator that creates complex multichannel scenarios: primarily for communications product development, it incorporates MIMO and fading requirements.

The R&S SMW200A high-end vector signal generator complex, digitally modulated signals of high quality. Thanks to versatile configuration options, its range of applications extends from single-path vector signal generator to multichannel MIMO receiver tester. It combines a baseband generator, RF generator and MIMO fading simulator in a single instrument. The vector signal generator covers the frequency range from 100 kHz to 3 GHz or 6 GHz and features an I/Q modulation bandwidth of 160 MHz with internal baseband. Its modulation and RF characteristics suit it to developing high-end components, modules and complete products for wideband communications systems such as LTE-Advanced and WLAN IEEE 802.11ac, and meets the needs of verification of 3G and 4G base stations as well as aerospace and defence applications.

The R&S SMW200A can be equipped with an optional second RF path for frequencies up to 6 GHz and with a maximum of two baseband and four fading simulator modules, giving two full-featured vector signal generators in a single unit. Fading scenarios such as 2x2 MIMO, 8x2 MIMO for TD-LTE and 2x2 MIMO for LTE-Advanced carrier aggregation can be simulated easily. Until now, this has required complex setups consisting of multiple instruments.

More than two RF sources are required for applications such as 3x3 MIMO for WLAN or 4x4 MIMO for LTE-FDD. In addition to the two internal RF paths provided, highly compact R&S SGS100A signal generator modules can be connected as additional RF sources and remotely controlled by the R&S SMW200A. This solution takes up only five height units for 4x4 MIMO receiver tests and provides correctly encoded baseband signals, realtime channel simulation, AWGN generation and, if required, phase-locked coupling of multiple RF paths.

Options for every important digital communications standard are available from the start: LTE, LTE-Advanced, 3GPP FDD/HSPA/HSPA+, GSM/EDGE/EDGE Evolution, TD-SCDMA, CDMA2000/1xEV-DO and WLAN IEEE 802.11a/b/g/n/ac. The standards run directly on the R&S SMW200A ‒ without having to connect an external PC, making it