Patent ID: 7486740

Claim:
A method of calibrating transmitter units and receiver units at a wireless entity in a multiple-input multiple-output (MIMO) communication system, comprising: obtaining a plurality of first overall gains for a first receiver unit and a plurality of transmitter units, one first overall gain for each transmitter unit, each first overall gain indicative of a combined response for the first receiver unit and the associated transmitter unit, each first overall gain proportional to a ratio of the signal level of a baseband signal sent by the associated transmitter unit to the first receiver unit, to the signal level of the baseband signal received by the first receiver unit from the associated transmitter unit, wherein the first receiver unit is one of a plurality of receiver units; obtaining a plurality of second overall gains for a first transmitter unit and the plurality of receiver units, one second overall gain for each receiver unit, each second overall gain indicative of a combined response for the first transmitter unit and the associated receiver unit, each second overall gain proportional to a ratio of the signal level of a baseband signal received by the associated receiver unit from the first transmitter unit, to the signal level of the baseband signal sent by the first transmitter unit to the associated receiver unit; determining a gain of each of the plurality of transmitter units based on the plurality of first overall gains; and determining a gain of each of the plurality of receiver units based on the plurality of second overall gains.