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MIMO system

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MIMO system connection framework


Based on usrp-lwx310 and ubx-lw 160m, we successfully built a 4x4 MIMO system (theoretically, the MIMO system can be expanded to 128 × 128). The system connection diagram is shown in the following figure:

System implementation principle


The system implementation principle is shown in the figure below:

1.      The host computer carries out source coding, channel coding and digital modulation;

2.      The upper computer transmits the data to two usrp-lw x310 through Gigabit switch for further processing: first, conduct digital up conversion, and then convert digital signal into analog signal through DAC transformation;

3.      The baseband signal is converted to the specified frequency by the sub board through up conversion, and then the signal is sent out by the antenna;

4.      The antenna at the receiving end receives the signal in the electromagnetic environment;

5.      The daughter board of the receiving end carries out down conversion of the electrical signal, and the processed signal is converted to analog-to-digital in usrp-lw x310, and then sent to FPGA for digital down conversion, and then the processed data is transmitted to the upper computer through the switch for further processing;

6.      The upper computer performs digital modulation, channel decoding and source coding

     


 

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