Enabling MIMO in UMTS will not give you much gain, as due to the coding/modulation scheme of UMTS, it is not very suitable for MIMO use. If you need to decide between MIMO or another carrier, I would suggest add a second carrier to your system. The fact the 2x2 MIMO theoretical maximum is 28Mbits, and the non-MIMO is 21.6 on UMTS it already gives you an impression of how little gain it will have.
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