Patent ID: 8761238

Claim:
A method for correcting a frequency offset in a distributed multiple input multiple output (MIMO) system, comprising: receiving n channels of first signals, wherein n is a positive integer; performing frequency offset correction processing on the n channels of first signals to obtain n channels of first corrected signals; acquiring n center tap coefficients of a space time equalizer that corresponds to the n channels of first corrected signals, n first output phases of a phase-locked loop phase detector that corresponds to the n channels of first corrected signals, and a second output phase of a phase-locked loop phase detector that corresponds to a superposed signal, wherein the superposed signal is a signal that is obtained after the n channels of first corrected signals are superposed one by one; acquiring n first estimated frequency offset values according to the n center tap coefficients and the n first output phases; acquiring a second estimated frequency offset value according to the second output phase; and receiving n channels of second signals, and performing frequency offset correction on the n channels of second signals according to the n first estimated frequency offset values and the second estimated frequency offset value; wherein acquiring n first estimated frequency offset values according to the n center tap coefficients and the n first output phases comprises: acquiring n first estimated sub frequency offsets according to the n center tap coefficients; acquiring n second estimated sub frequency offsets according to the n first output phases; and performing gain control and superposition and combination processing on the n first estimated sub frequency offsets and n second estimated sub frequency offsets corresponding to the n first estimated sub frequency offsets to obtain n first estimated frequency offset values.