MIMO-OFDM modulation system
Based on the USRP-LW X310 and the RF daughter board UBX-LW 160M, a
4x4 MIMO-OFDM system was successfully built. The system connection
block diagram is shown in the following figure:
The system implementation principle is shown in the following
figure:
- The host computer performs data spatio-temporal coding and OFDM
modulation to generate baseband modulation data;
- The host computer passes the data through a gigabit switch to two
USRP-LW X310s for further processing: first digital upconversion,
and then through the DAC Transformation, which converts a digital
signal into an analog signal;
- The daughter board converts the baseband signal to a specified
frequency by upconversion, and then the antenna sends the signal
out;
- The antenna at the receiving end receives a signal in the
electromagnetic environment,
- The daughter board at the receiving end downconverts the electrical
signal, converts the processed signal to analog-to-digital from the
ADC in the USRP-LW X310, and then sends it to the FPGA for digital
downconversion, and then passes the processed data through the
switch Passed to the host computer for further processing;
- The host computer decompresses the signal BYDM, decodes the
spatio-temporal encoding, and recovers the baseband data
