MASI system concept

MASI is our Multiple Antenna System for ISM-Band Transmission.
One motivation to built a MIMO hardware demonstrator is that the assumptions made about real channels may be incorrect, and the behavior of MIMO systems should be investigated under realistic conditions. Therefore it is sufficient to transmit and receive over a real channel and process the received data offline at the workstation environment. This basic idea roots in our single antenna system.

• transmission frequency in 2.4 GHz ISM-band
  (5 MHz channel stepsize / 8 frequencies possible)
• transmission power: +17 dBm (50 mW)
• direct conversion transmitter and receiver (AD 8346/8347)
• analog I/Q-bandwidth: +-16 MHz (depending on receive filters)
• 12 bit D/A converter (AD 9765)
• sampling frequencies: 10 MHz, 40 MHz, 50 MHz, PLL and external input
• maximum memory depth 512k (Tx) resp. 1024k (Rx) I/Q-samples
• PC connection (data and control) using the USB interface, supports Windows and Linux
• external connectors for the 2.4 GHz carrier frequency and 10MHz reference frequency
• control software for data transfers and settings (used memory depth, sampling frequency, automation of multiple measurements)
• binary file for each channel: alternating I/Q-samples as 16 bit integers

          --> easy interfacing with Matlab or other tools

Some more detailed information can be found in a set of slides documenting some of our first activities with MASI.

We invite you...

We invite you and your institute to evaluate your MIMO (and SISO)-algorithms using our testbed.
You can send us your transmission file consisting of binary I/Q samples after digital impulse shaping, and we transmit it using our system....

Feel free to contact us for further information: Henning Paul.

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