FREQUENCY RESPONSE CALIBRATION OF SYNCHRONIZED MIMO MEASUREMENT RECEIVERS WITH LOCAL AND REMOTE TRANSMITTERS

摘要

Techniques are disclosed related to calibrating and operating a multiple input multiple output (MIMO) radio system. Some embodiments comprise a method wherein a single calibration signal is used to calibrate a MIMO radio system by performing each of time synchronization, phase synchronization, and frequency response correction for multiple receivers. A dual mode calibration may be employed to calibrate a remote transmitter (RT). During a first, Sparse Full System Calibration (SFSC) mode, the RT may be physically connected to the MIMO radio system. In some embodiments, first and second equalizers may be derived for each of the RT and a local transmitter (LT), respectively. During a subsequent, Real-time Calibration (RTC) mode, the RT may be located remotely from the MIMO radio system, and third equalizers may be derived for the LT. The RT may then be calibrated based on an equalizer derived from each of the first, second, and third equalizers.