Mimo systems with independent oscillators and phase noise mitigation method thereof

A MIMO (multi-input multi-output) system in which each antenna has an independent oscillator, comprising:

• multiple receiving antennas;
• multiple oscillators connected to the multiple receiving antennas, respectively;
• a memory configured to store a program for mitigating phase noises of a receiving terminal and a transmission terminal from a signal received through a receiving antenna and an oscillator;
• and
• a processor configured to execute the program,
• wherein upon execution of the program, the processor estimates multiple parameters for a phase noise of a transmission terminal and a phase noise of a receiving terminal on the basis of a result of mathematical modeling of signals transmitted and received through the MIMO system and mitigates phase noises of the transmission terminal and the receiving terminal which are estimated from the signal received through the receiving antenna and the oscillator, and
• the estimation of multiple parameters is performed by repeatedly and alternately computing relations for the phase noises of the transmission terminal and the receiving terminal, and if an error value obtained from a result of the repeated computations is greater than an error value obtained from a previous repetition step, stopping the repeated computations and outputting data calculated in the previous repetition step.