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