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Quantify the amount of the feedback resource required to maintain at least a given throughput performance gap between zero-forcing with perfect feedback and with limited feedback, i.e.,
:<math>\Delta R = R_{ZF} - R_{FB} \leq log_2 g</math> mn.
Jindal showed that the required feedback bits of a [[Spatial Correlation|spatially uncorrelated]] channel should be scaled according to SNR of the downlink channel, which is given by<ref name="Jindal_ZF"/>:
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