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Lower bound on mean squared channel estimation error for multiuser receiver

: Boche, H.; Stanczak, S.


Skellern, D. ; IEEE Circuits and Systems Society:
ISCAS 2001, IEEE International Symposium on Circuits and Systems. Conference proceedings. Vol.2 : 06 - 09 May 2001, Sydney Convention and Exhibition Centre, Darling Harbour, Sydney, Australia
Piscataway, NJ: IEEE, 2001
ISBN: 0-7803-6685-9
International Symposium on Circuits and Systems (ISCAS) <34, 2001, Sydney>
Conference Paper
Fraunhofer HHI ()
error; multipath channels; multiuser channels; parameter estimation; radio receiver; radio reception; lower bound; mean squared channel estimation error; multiuser receiver; pilot-based multiuser channel estimation system; multipath radio environment; n-periodic pilot sequence; optimal linear estimator

We investigate pilot-based multiuser channel estimation systems for a multipath radio environment, in which each user sends an individual N-periodic pilot sequence to the common receiver so as to estimate its N uncorrelated multipath components. For the case that all paths having the same average power output, we derive the optimal linear estimator in the absence of any prior knowledge about any distribution and give a lower bound on the maximum mean squared estimation error that grows linearly with the number of users. We also specify necessary and sufficient condition to attain this bound.