Channel-Eigenvector Invariant Space Time
2004
A channel-eigenvector invariant space-time constel- lation (CEI-STC) is a set of matrices such that the product of any pairwise difference matrix and its complex conjugate transpose is a scalar matrix. The pairwise error probability of a multi-antenna system equipped with the CEI-STC does not depend on the eigen- vectors of the channel matrix. It may, however, depend on the eigenvalues of the channel. The maximum cardinality of a CEI- STC whose entries are restricted to a finite set is studied. A lower bound and an upper bound on the maximum cardinality are ob- tained.
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KQI