R&S drive-test software gains MIMO functions

The software can measure the MIMO channel matrix for 4x2 and 2x2 systems.

-- Test & Measurement World, 1/24/2012 7:00:00 AM

Rohde & Schwarz has added MIMO-specific measurement functions to its ROMES4 drive-test software. Together with the company's TSMW network scanner, the updated software lets you quickly identify interferers that reduce MIMO performance in LTE networks.

ROMES4.65 allows network operators and infrastructure manufacturers to collect important MIMO data during a drive test-data that can be essential in determining where an investment in MIMO pays off in their coverage area and where MIMO can be implemented smoothly and efficiently. When used with the TSMW network scanner with its two integrated receivers, the software can measure the MIMO channel matrix for 4x2 and 2x2 systems.

From the matrix, the Windows-based software calculates a parameter known as the condition number, which indicates the capacity gain that can be achieved with MIMO. A GPS receiver assigns this data to the exact position and clearly displays it on a map. ROMES4.65 performs MIMO measurements on all bandwidths up to 20 MHz and detects interference over the entire bandwidth used by the LTE signal.

MIMO-specific measurements are saved in a complex channel matrix with a time component, the phase shift, and can be exported for field-to-lab applications. Using fading emulators, a complete mobile radio network can be reproduced in the lab simulating real field conditions.

In addition to LTE, the ROMES4 drive-test software supports UMTS, GSM, and CDMA standards. Flexible software licenses are available to reduce startup costs.

Rohde & Schwarz, www.rohde-schwarz.us/file_17171/ROMES4_bro_en.pdf