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which is the full multiplexing gain of the downlink [1, 25].
Thus the CSIT of users is indispensable to achieve the full multiplexing gain [1, 3].
The optimal number of feedback bits required to achieve the full multiplexing gain is computed.
The minimal number of feedback bits required to achieve the full multiplexing gain is summarized in Theorem 1 as following.
Furthermore, the full multiplexing gain in SU-MIMO systems is only achieved at very high SNR; see [24].
Moreover, MIMO techniques have been developed to achieve the full multiplexing gain in multi-user system by using space division multiple access (SDMA) schemes [3].
Similar(28)
In K-user interference channels, IA is shown to achieve full K/2 multiplexing gain per time, frequency and antenna dimension [9].
Multiuser MIMO precoding and scheduling techniques require an accurate knowledge of the CSI at the transmitter to achieve full multiuser multiplexing gain [3, 9, 10].
Based on the closed-form rate bounds, sufficient and necessary conditions on the feedback channels to ensure nonzero and full downlink multiplexing gain are obtained.
However, it is sufficient to reconstruct the channel based on a finite number of parameters by making use of the correlation in time and frequency while conversing the full spatial multiplexing gain.
In order to achieve full downlink multiplexing gain, it is sufficient and necessary to scale the average feedback link SNR linearly with the downlink SNR for AF in both AWGN and Rayleigh fading feedback channels.
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