MIMO (Multiple-Input Multiple-Output) is a key technology for IEEE .802.11n, WiMax, and LTE utilizing multiple antennas at both the transmitter and receiver to improve wireless communication performance.
Analysis for US patents issued before May 1, 2009 and published patent applications before May 1, 2009 shows that there was a dramatic increase in patent applications recently due to active technology innovations in 4G mobile communications.
As for the issued patents, Qualcomm is the leader followed by Intel and Lucent as of April 30. 2009.
As for the published patent applications, Samsung is the leader followed by Qualcomm, InterDigital, Broadcom, and TI as of April 30. 2009.
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