Near-optimal low-complexity decoding of space-time codes for fixed wireless applications
AssigneeAT&T Wireless Svcs. Inc.
InventorsTitus Lo, Vahid Tarokh
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Abstract
An improved multi-antenna receiver is realized for detecting signals transmitted by a multi-antenna transmitter by summing signals received at the plurality of receiver antennas after multiplying each by a respective constant. The summed signal is applied to a maximum likelihood detector. The respective constants, λj, where j is an index designating a particular receiver antenna, are determined by evaluating the largest eigenvector of the matrix A, where Λ is a vector containing the values λj, and A is a matrix containing elements αij, which is the transfer function between the ith transmitter antenna to the jth receiver antenna. The αij terms are determined in the receiver in conventional ways.
Claims4
A receiver comprising:
- an n plurality of antennas, where n is greater than one;
- circuitry for obtaining n signals transmitted from m antennas of a transmitter, where m is greater than one;
- and
- processing means for
- developing a sum signal that corresponds to the addition of said n signals that are each pre-multiplied by a respective factor λj, where j is an index integer specifying that factor λj multiplies the signal received from antenna j of said n plurality of antennas,
- developing values for transfer functions αij, where i is an index that references said transmitting antennas, and j is an index that references said receiving antennas,
- developing said factors λj from said transfer functions, where said factors are components of a vector Λ where Λ is an eigenvector of A, and where A is a matrix containing said elements αij, and
- detecting symbols transmitted by said m transmitter antennas embedded in said sum signal.
Dependencies are inferred from the claim text.