Method of compensating for correlation between multiple antennas
First Claim
1. A method of transmitting signals from a transmitter comprising three or more antennas in a wireless telecommunications network, comprising:
- space-time block encoding at least one data sequence;
applying to the data sequence a linear transformation dependent upon knowledge of correlation among the antennas to at least partially compensate the transmitted signals for said correlation, wherein the linear transformation depends on the eigenvalues of an antenna correlation matrix and a ratio of symbol energy to noise variance; and
transmitting the encoded and transformed data sequence.
8 Assignments
0 Petitions
Accused Products
Abstract
A method is provided of transmitting signals from two or more antennas in a wireless telecommunications network, in which at least one data sequence is space-time block encoded. Before transmitting the data sequence, a linear transformation is applied to the data sequence, the linear transformation being adapted to use knowledge of correlation among the antennas to at least partially compensate the transmitted signals for said correlation. The linear transformation depends on the eigenvalues of an antenna correlation matrix. The linear transformation further depends on a ratio of symbol energy (ES) to noise variance (σ2). The method includes transmitting the encoded and transformed data sequence.
-
Citations
15 Claims
-
1. A method of transmitting signals from a transmitter comprising three or more antennas in a wireless telecommunications network, comprising:
-
space-time block encoding at least one data sequence;
applying to the data sequence a linear transformation dependent upon knowledge of correlation among the antennas to at least partially compensate the transmitted signals for said correlation, wherein the linear transformation depends on the eigenvalues of an antenna correlation matrix and a ratio of symbol energy to noise variance; and
transmitting the encoded and transformed data sequence. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A transmitter for wireless telecommunications comprising a space time block encoder, and a linear transformation apparatus operative to transform the data sequence from or to a space-time block encoder to at least partially compensate for correlation between antennas, and the transmitter comprising two or more antennas operative to transmit the encoded and transformed data sequence, the linear transformation apparatus comprising:
-
a first processor operative to determine an antenna correlation matrix (R); and
a second processor operative to;
determine the eigenvalues of the antenna correlation matrix;
determine the ratio of symbol energy to noise variance; and
,determine a linear transformation matrix (L) to be applied dependent upon the eigenvalues and on a ratio of symbol energy to noise variance. - View Dependent Claims (8, 9, 10)
-
-
11. A receiver for mobile telecommunications comprising a space-time block decoder and a channel estimator, the antenna correlation matrix (R) being determined from the received channel estimates provided by the channel estimator, the space-time block encoder comprising a processor operative to determine a antenna correlation matrix (R), and a processor operative to:
-
determine the eigenvalues of the antenna correlation matrix;
determine the ratio of symbol energy to noise variance; and
determine a linear transformation matrix (L) that was applied dependent upon the eigenvalues and on a ratio of symbol energy to noise variance.
-
-
12. A space- time block decoder comprising a first processor operative to determine an antenna correlation matrix, and a second processor operative to:
- determine three or more eigenvalues of the antenna correlation matrix, determine the ratio of symbol energy to noise variance, determine a linear transformation matrix that was applied dependent upon the eigenvalues and on a ratio of symbol energy to noise variance.
- View Dependent Claims (13)
-
14. A linear transformation apparatus operative to transform symbols from or to a space-time block encoder to at least partially compensate for correlation between antennas of a transmitter comprising three or more antennas, comprising:
- a first processor operative to determine an antenna correlation matrix (R), and
a second processor operative to;
determine the eigenvalues of the antenna correlation matrix;
determine the ratio of symbol energy (ES) to noise variance; and
determine a linear transformation matrix (L) to be applied dependent upon the eigenvalues and on the ratio of symbol energy to noise variance.
- a first processor operative to determine an antenna correlation matrix (R), and
-
15. A method of linear transformation of symbols from or to a space-time block encoder to at least partially compensate for correlation between antennas of a transmitter comprising at least three antennas, the method comprising the steps of:
-
determining an antenna correlation matrix;
determining the eigenvalues of the antenna correlation matrix; and
determining the ratio of symbol energy to noise variance, and determining a linear transformation matrix (L) to be applied dependent upon the eigenvalues and on the ratio of symbol energy to noise variance.
-
Specification