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where <math>s_i</math> is the transmitted signal of user <math>i</math>, <math>\mathbf{n}</math> is the <math>N_r \times 1</math> noise vector, <math>\mathbf{h}_k</math> is the <math>N_r \times 1</math> channel vector.
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.,,
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