Redundant filterbank precoders and equalizers. II. Blind channelestimation, synchronization, and direct equalization
Scaglione, A.; Giannakis, G.B.; Barbarossa, S.
Signal Processing, IEEE Transactions on
Volume 47, Issue 7, Jul 1999 Page(s):2007 - 2022
Digital Object Identifier 10.1109/78.771048
Summary:For pt.I see ibid., vol.47, no.7, p.1988-2006 (1999). Transmitter
redundancy introduced using finite impulse response (FIR) filterbank
precoders offers a unifying framework for single- and multiuser
transmissions. With minimal rate reduction, FIR filterbank transmitters
with trailing zeros allow for perfect (in the absence of noise)
equalization of FIR channels with FIR zero-forcing equalizer
filterbanks, irrespective of the input color and the channel zero
locations. Exploiting this simple form of redundancy, blind channel
estimators, block synchronizers, and direct self-recovering equalizing
filterbanks are derived in this paper. The resulting algorithms are
computationally simple, require small data sizes, can be implemented
online, and remain consistent (after appropriate modifications), even at
low SNR colored noise. Simulations illustrate applications to blind
equalization of downlink CDMA transmissions, multicarrier modulations
through channels with deep fades, and superior performance relative to
CMA and existing output diversity techniques relying on multiple
antennas and fractional sampling
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