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Johan

Hi Martin,

To answer your question. Modeling the antenna should be a relatively easy task once you have measured it correctly.

The easiest would be to model the antenna of the base station. They are typically located in a relatively undisturbed environment.

More complicated is the modeling of the mobile antenna, most of us hold the mobile close to our heads with out hands... and our heads, hands and how we hold the mobile is all different.

How to model this is not easy and we did discuss this in RAN4 a long time ago.. I remember that Telia made quite a lot of work on that back then. They also had a memorable contribution on replacement antennas with LED that were sold in Japan. We all know that LEDs are non-linear elements and this causes harmonics. One of the harmonics from the GSM band ended up in the air traffic control radar systems....

Anyway to put in this sort of static model of one or more antennas should be one of the easiest tasks for any fading simulator. They simulate very complex dynamic scenarios, in real time.

For me the whole area of testing is mostly a receiver testing issue (and maybe antenna pattern)

I must also say that I tend to disagree with the statement that multiple receive antennas are more worth then multiple transmit antennas. From a system point of view it can not be the case. It is all about the correlation of the two antennas. From a design point of view it is probably easier to make single transmit systems.
Here the problem most likely lies in the fact that when we do not have a connection to the network, then the network is to blame.... not the mobile. So where is then the motivation for a mobile manufacturer to implement receive diversity? It will have a cost in power consumption and manufacturing.. Are we ready to pay for that?
(The Japanese 2G system PDC mandated receive diversity also for the mobiles)

Now all of this has not really covered MIMO testing. For me MIMO testing is when we have multiple transmitters and multiple receivers. The key issue here is how do you model the channel? The number of combinations are just endless.

Cheers
Johan

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