Anritsu launches portable W-CDMA area tester

date: August 16, 2001

Anritsu has launched the ML8720B, a portable W-CDMA tester for the evaluation of radio propagation characteristics in the area surrounding 3G mobile base stations. The new unit will find applications in installation, commissioning, investigation and maintenance.

The ML8720B`s measurement functions include received signal code power (RSCP), the ratio of desired receive power per chip to receive power density in the band (Ec/No), and signal interference ratio (SIR), all of which are used to evaluate the strength of the radio signal received from each base station; and the delay profile, which is used to evaluate the delay characteristics of the signal caused by multi-path propagation. RSCP, Ec/No and SIR can all be measured at 30cm intervals while travelling at 100km/h in a monitoring vehicle, to provide fast and accurate area analysis. In addition a time/distance variation display is also available to show how the received signal level is changing with respect to relative position. This is ideal for investigating soft-handoff operations.

The measured data can be correlated with GPS positioning data and saved to a memory card. Also, the measured data and positioning information can be downloaded in real time to an external PC via the RS-232 interface. It can then be used in conjunction with other software, such as mapping systems, to allow evaluation linked to area maps.

The ML8720B has two measurement modes: unspecified and specified base station. The Common Pilot Indication Channel (CPICH) is measured in both modes. In unspecified base station measurement mode, measurement is performed without knowing the base-station scrambling code, so any base station in the area will be measured; in specified base-station measurement mode, the scrambling code is known, so measurements are performed on a specified base station. When used in combination with the optional diversity function, even higher-accuracy measurements, such as CPICH transmit diversity format and receive antenna diversity, can be performed.

In addition to stand-alone measurement using a single unit, several ML8720Bs can be connected as one master and several slaves, permitting parallel master/slave measurements. Separate measurement channels can be specified for each ML8720B to greatly reduce the initial code detection time. Weighing at 4kg, the ML8720B is easily portable, making it suitable for a wide range of measurement tasks that are difficult or impossible for current desktop testers. The unit`s lithium-ion battery pack provides more than three hours of operation, and spare battery packs are available to increase this time if needed. Large amounts of measured data can be saved to flash memory cards with up to 256Mbyte capacity. The 8.4 inch colour LCD is easy to view under any lighting conditions.

http://www.eu.anritsu.com/

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