Adaptive WCDMA (P14)

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Adaptive WCDMA (P14)

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MMSE multiuser detectors 14.1 MINIMUM MEAN-SQUARE ERROR (MMSE) LINEAR MULTIUSER DETECTION If the amplitude of the user’s k signal in equation (13.7) is Ak , then the vector of matched filter outputs y in equation (13.10) can be represented as y = RAb + n where A is a diagonal matrix with elements Ak A = diag||Ak || (14.2) (14.1) If the multiuser detector transfer function is denoted as M, then the minimum mean-square error (MMSE) detector is defined as M ∈ R K×K min E ||b − My||2 (14.3) One can show that the MMSE linear detector outputs the following decisions [1–3]: ˆ bk = sgn 1...

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