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Krylov Subspace Method Based Low-Complexity MIMO Multi-User Receiver for Time-Variant Channels

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2 Author(s)
Dumard, C. ; Forschungzentrum Telekommunikation Wie, Vienna ; Zemen, T.

We consider the uplink of a time-variant multiple-input-multiple-output (MIMO) multi-user (MU) multi-carrier (MC) code division multiple access (CDMA) system. The linear minimum mean square error (LMMSE) filters for channel estimation and multi-user detection at the receiver side require too high complexity to be implementable in a system operating in time-variant channels. We develop a low-complexity implementation of an LMMSE filter based on the Krylov subspace method. We are able to reduce the computational complexity by one order of magnitude. Furthermore, in a system with K users having N T transmit antennas, parallelization of the computations of the multi-user detector into KNT branches is achieved as well as considerable storage reduction. We discuss more specifically a fully loaded system (the number of subcarriers N is equal to the number of users K) with NT = 2 transmit antennas per user, NR = 4 receive antennas and K = N = 64

Published in:

Personal, Indoor and Mobile Radio Communications, 2006 IEEE 17th International Symposium on

Date of Conference:

11-14 Sept. 2006