QPER - Characteristics

Propagation Effects Replicator (QPER)

Operation

QPER employs a completely intuitive graphical user inter-face, enabling the user to define virtual sceneries of cells and sectors, obstacles (radio shades, rooms, areas with multipath fading), and mobile trails.

Qosmotecs Air Interface Simulator (AIS) Dual 4X4 Rack

Delay, Doppler, power and phase shift are automatically adjusted in accordance with the motion and position of the terminal relative to the base station. Base station coverage patterns can be imported and simulated.

QPER enables testers to implement all channel models defined by 3GPP/3GPP2 and the WiMax Forum, plus models defined by the user, combined with virtual drive tests. Channel models are associated with Effects Areas (yellow area in the picture at right) and applied when the mobile enters such an area. A scenery may include multiple areas with individual effect settings.

Scalability, Extensibility & Flexibility

The QPER hardware consists of a set of plug-in boards plugged into a 19” carrier unit. Each channel, corresponding to either an uplink or downlink, employs an RF board, which extracts the desired band and converts it to IF, and a digital processing board that applies the channel effects on the IF signal, before it is fed back into the RF board for upconver-sion. Hence, QPER is scalable and extendable from a single channel to a system incorporating multiple 19” units.

By external wiring, 2 n x m channels can be interconnected as a fully meshed network of n terminals and m base stations with separate uplinks and downlinks.
More inherent flexibility is yielded by the signal processing algorithms being implemented the in firmware. Thus, new custom channel effects or fading models can be retrofitted to an existing QPER system.

QPER seamlessly integrates with Qosmotec’s AIS. Both tools can share a common GUI and control server, so an AIS system with numerous handover channels can be combined with a QPER system providing extra channels with full propagation effects simulation under the same GUI

Special support for MIMO testing

As an extension option, every channel with 12 (or 24) multipath tabs can be partitioned under software control into 2, 3 or 4 subchannels of the same frequency, provi-ding 6 (12), 4 (8), or 3 (6) taps each. A subchannel emu-lates one link between MIMO antenna elements of BS and mobile. This way, the number of channels can be increased fourfold. An 8 channel QPER system will enable you to simulate all 16 uplinks and 16 downlinks between 4 BS and 4 MS antenna elements.
Furthermore, individual control of phase shift on each link allows tests of smart antenna array pointing by simulating the varying phase shift of signals arriving from subscribers in different directions.

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QPER

	Description
	Characteristics
	Specifications

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QPER Brochure

PRODUCTS

	Overview
	Air Interface Simulator (AIS)
	Lab Test System (LTS)
	Lab Test System - Field Adaptation (LTS-F)
	Lab Test System - Portable (LTS-P)
	QPER
	QUANT

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