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Channel simulator for mobile systems

a simulator and mobile system technology, applied in the field of channel simulators for mobile systems, can solve the problems of not being able to, realistically, and modelled in the correct way of frequency correlation characteristics

Inactive Publication Date: 2009-11-17
HANGER SOLUTIONS LLC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017]An example of such an advantage is the possibility to vary the time delay of the taps, which gives a unique uninterruptible channel, in contrast to present static technology. This gives a realistic picture of the slowly varying broadband channel qualities. By the invention it consequently will be possible to estimate performance of frequency hopping systems.
[0018]Present channel simulation technology gives the channel a constant attenuation per tap, leaving the rapid fading out of account. By the invention is made possible continuously varying tap attenuation, which imitates the shadow fading qualities of the channel.

Problems solved by technology

The fixed taps according to COST 207 constitute a static model, which results in that the characteristics with regard to the frequency correlation is not modelled in a correct way.
With that it is not possible to, in a realistic way, test frequency hopping with channel simulators which use such a fixed “tapped delay line”-structure.

Method used

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Embodiment Construction

[0024]In the following description is referred to FIG. 1. FIG. 1 illustrates two delay modules B which emulate either two taps with the same delay span, or two taps where the delay modules B are connected in series to attain increased time delay in one of the taps. The amplifiers at the input of the delay modules B compensate for attenuation in these. The number of necessary outputs from the delay modules is rather large.

[0025]It should be realized that just any number of delay modules can be utilized in the channel simulator.

[0026]The invention consists of a channel simulator for mobile communications systems (for instance GSM) which in a flexible and realistic way both emulates the time dispersive qualities and the broadband frequency correlation qualities of the radio channel.

[0027]The invention is characterized in a plurality of flexible delay modules B, where each module emulates one tap. The number of taps can, for instance, correspond to that of the COST 207-model (6 or 12). ...

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Abstract

A device and a method at a mobile communication system which provide a flexible and realistic way of emulating the time dispersive qualities and the broadband frequency correlation qualities of a radio channel. The device includes two or more flexible delay modules, and each module is arranged to emulate a tap and a continuously varying tap attenuation can be attained to describe the variation of the radio channel over the time. The modules may be realized in SAW-technology, and continuously varying tap attenuation may be achieved by the utilization of PIN-diode attenuators.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a device and a method for channel simulation in a mobile communications system.[0003]2. Discussion of the Background[0004]At technical tests of mobile radio equipment, channel simulators (channel modulators) are used to emulate a realistic mobile radio channel under controlled forms. By means of a channel simulator, radio network functions such as handover, power control, and frequency hopping can be tested before they are used on a larger scale in the network.[0005]The radio network function frequency hopping can be used in mobile communications systems in order to improve transmission performance by diversity gains for two differents disturbance causes. One quality of frequency hopping is interference diversity which may result in improvements in loaded networks. The other quality is generally called frequency diversity, and emanates from that the fading of the radio channel is not con...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04W40/00H04B17/00
CPCH04B17/0087
Inventor WIDELL, SVANTEWINROTH, MATS OLOF
Owner HANGER SOLUTIONS LLC
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