Multiuser downlink beamforming‌ Sample Clauses

Multiuser downlink beamforming‌. Consider a base station (BS) equipped with an array of M antenna elements transmit- ting to U single-antenna users. The signal received by any user i, i.e., yi, i ∈ {1, · · · , U}, is given by yi = hiwisi + j=Σ1,j/=i hiwjsj + ni (2.42) U where hi ∈ C1×M is the MISO vector channel between user i and the BS, wi ∈ CM×1 represents the beamforming vector for user i, si is the intended symbol for user i and finally ni is the zero mean circularly symmetric complex Gaussian (ZMCSCG) random variable, i.e., ni ∼ N(0, σ2), modeling the additive white Gaussian noise at the receiving point of user i. Without loss of generality, assuming that E |si|2 = 1, ∀i.
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