Simulation of the transmission path between the base stations
Application
In mobile communication equipment such as mobile phone, the information should be transferred without breaking off when the transmission path is switched from a base station to next base station (called handover).
This handover test can be simulated using two or more units of MAT800 or MAT810.
Solution
- Since mobile phone goes away from the base station A, the receiving level becomes low gradually, and conversely it becomes high gradually in the base station B. Moreover, there may be an obstacle blocking the radio wave in the middle.
This simulation is shown in the figure above “Signal generation”. - High-speed programmable attenuators MAT800/810 are electronic type. Since any spike and chattering are not generated when switching, it is the optimum instrument for simulating the change of radio wave in the air.
- The difference and feature from conventional attenuator are shown in the table below.
[Difference and feature from conventional attenuator]
| Item | Traditional attenuator | MAT800/810 | Remarks |
|---|---|---|---|
| Swiching method | Mechanical | Electronic | |
| Swiching speed | 0 to 20ms/point | 2μs/point | Great improvement of time resolution |
| Attenuation step | 1dB | 0.05dB | Great improvement of amplitude resolution |
| Spike at swiching |  Large spike |
 No spike |
The spike causes the communication error |
| Proguram memory | Nothing | 128ｋword built-in program memory | The air state is stored |
| Program memory | Nothing |
|
Various memory readout function |
| Software for maiking | Nothing | Making attenuation progrum can be done as easily as maiking arbitrary waveform. | Standard accessory of MAT800/810 |
System configuration
| MAT800 x 2 units | |
|---|---|
| Base station simulator | x 2 |
| High-speed programmable attenuator ［MAT800/model D］ | x 2 |
| Software for making attenuation program ［MAS800] | x 2 |
| SMA => N coaxial cable 1.5m ［MC204-MA306］ | 4 |
| Biconical Antenna ［MBA301］／accessories | 4 |
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