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MMSE limitations for subband adaptive equalisers

Mohamad, H. and Weiss, S. and Rupp, M. (2002) MMSE limitations for subband adaptive equalisers. In: Signal systems and computers 2002. IEEE, New York, pp. 1233-1237. ISBN 0780375769

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We investigate limitations of the minimum mean square error (MMSE) solution for subband adaptive equalisers due to aliasing and error in power complementarity. By deriving the Wiener solution for the subband equaliser and comparing it against simulations, we verify that aliasing caused in the subband decimation can be considered equivalent to channel noise. We discuss how these limitations can be mitigated by careful system design.