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_______ is an additional open-loop MIMO technique considered by the WiMAX vendors.

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_______ is an additional open-loop MIMO technique considered by the WiMAX vendors.

(a) STTD

(b) SM

(c) Collaborative Uplink MIMO

(d) MU-MIMO

I have been asked this question by my school principal while I was bunking the class.

This intriguing question originated from Multiple Input Multiple Output (MIMO) in section 4G of Wireless/Mobile

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The correct option is (c) Collaborative Uplink MIMO

To explain: Collaborative MIMO is an open-loop MIMO technique considered by the WiMAX vendors to surge the spectral efficiency and capacity of the uplink communications path. It is compared with the regular spatial multiplexing, wherein data streams are transmitted multiplying from multiple antennas on the same device.

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