A plurality of transmitting antennas and receiving antennas are used respectively at the transmitting end and the receiving end, so that the signal is transmitted and received through a plurality of antennas at the transmitting end and the receiving end, and a plurality of channels are formed between the sending and receiving for data transmission, and multiple channels occupy only one wireless channel.
MIMO (Multiple Input Multiple Output) technology refers to the use of multiple transmitting antennas and receiving antennas at the transmitting end and receiving end respectively, so that signals are transmitted and received through multiple antennas at the transmitting end and receiving end, and multiple channels are formed between transceiver and receiver for data transmission.
The essence of MIMO technology is to use multiple antennas to provide diversity gain (spatial diversity) and multiplexing gain (spatial multiplexing), the former to ensure the transmission reliability of the system, the latter to improve the transmission rate of the system. The essence of spatial diversity is to provide multiple independent fading copies of information symbols to the receiver to reduce the probability of signal deep fading, so as to achieve the purpose of improving system performance and improving transmission reliability and robustness. For MIMO systems, fading is independent between each pair of transceiver antennas, so MIMO channels can be regarded as multiple parallel spatial subchannels. Spatial multiplexing is to transmit different data on these independent parallel paths, thus greatly improving the channel capacity. Theoretically, the channel capacity of MIMO system can increase linearly with the increase of the number of transmitting and receiving antennas.
