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We address the problem of designing jointly optimum linear precoder and decoder for a MIMO channel possibly with delay-spread, using a weighted minimum mean-squared error (MMSE) criterion subject to a transmit power constraint. We show that the optimum linear precoder and decoder diagonalize the MIMO channel into eigen subchannels, for any set of error weights. Furthermore, we derive the optimum linear precoder and decoder as functions of the error weights and consider specialized designs based on specific choices of error weights. We show how to obtain: (1) the maximum information rate design; (2) QoS-based design (we show how to achieve any set of relative SNRs across the subchannels); and (3) the (unweighted) MMSE and equal-error design for fixed rate systems
Published in:
Communications, IEEE Transactions on
(Volume:49
,
Issue:
12
)
Date of Publication: Dec 2001
- Page(s):
- 2198 - 2206
- ISSN :
- 0090-6778
- INSPEC Accession Number:
- 7141882
- Digital Object Identifier :
- 10.1109/26.974266
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 06 August 2002
- Issue Date :
- Dec 2001
- Sponsored by :
- IEEE Communications Society
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