Indian Patents. 257699:A TRANSMITTER IN A COMMUNICATION SYSTEM FOR SPACE-TIME FREQUENCY BLOCK CODING SELECTED BY USING A PERMUTATION MATRIX

Title of Invention	A TRANSMITTER IN A COMMUNICATION SYSTEM FOR SPACE-TIME FREQUENCY BLOCK CODING SELECTED BY USING A PERMUTATION MATRIX
Abstract	A space-time-frequency block coding apparatus and method in a transmitter with three transmit (Tx) antennas are provided. An input symbol sequence is transmitted through three Tx antennas according to a permutation method using a selected transmission matrix in order to improve the performance of an STFBC.

Full Text	WE CLAIM 1. A transmitter with three transmit antennas in a communication system using a space-time-frequency block coding scheme, the transmitter comprising: a pre-coder for pre-coding a symbol vector of an input symbol sequence by multiplying the symbol vector by ejθ, θ being a phase rotation angle, reconstructing the symbol vector multiplied with ejθ and outputting pre- coded symbols c1, c2, c3, and c4, given as, c1=x1+jy3 c2=x2+jy4 c3=x3+jy1 c4=x4+jy2 where ck represents a kth pre-coded symbol, xk represents a real term of kth symbol within the symbol vector multiplied with ejθ, and jyk represents an imaginary term of kth symbol within the symbol vector multiplied with ejθ; and a space-time-frequency block code (STFBC) mapper for selecting an STFBC using a permutation matrix in which the following matrices A, B and C are arranged in a predetermined order, mapping the pre-coded symbols to the transmit antennas according to the selected STFBC, and transmitting the mapped symbols through the transmit antennas, 1 where a row represents symbols for a corresponding antenna and a column represents symbols mapped with a subcarrier. 2. The transmitter as claimed in claim 1, wherein the STFBC mapper includes a mapper for mapping the pre-coded symbols to the transmit antennas according to the selected STFBC and transmitting the mapped symbols through the transmit antennas. 3. The transmitter as claimed in claim 1, wherein the permutation matrix is given by Ak:k=mod(floor((index of logical data subcarrier-1)/ 2), 3)+1 where Ak(A1=A, A2=B, A3=C) is an antenna grouping pattern for subcarriers, index of logical data subcarrier ranges from 1 to the total number of subcarriers. 4. The transmitter as claimed in claim 1, wherein the permutation matrix is where a row represents symbols for a corresponding antenna and a column represents symbols mapped with a subcarrier. 5. The transmitter as claimed in claim 2, wherein the permutation matrix is where a row represents symbols for a corresponding antenna and a column represents symbols mapped with a subcarrier. 6. A transmitter with three transmit antennas in a communication system using a space-time-frequency block coding scheme, the transmitter comprising: a pre-coder for pre-coding a symbol vector of an input symbol sequence by multiplying the symbol vector by ejθ, θ being a phase rotation angle, reconstructing the symbol vector multiplied with ejθ and outputtihg pre- coded symbols c1, c2, c3, and c4, given as, c1=x1+jy3 c2=x2+jy4 c3=x3+jy1 c4=x4+jy2 where ck represents a kth pre-coded symbol, xk represents a real term of kth symbol within the symbol vector multiplied with x, and jyk represents an imaginary term of kth symbol within the symbol vector multiplied with ejθ; and a space-time-frequency block code (STFBC) mapper for selecting an STFBC using a permutation matrix calculated by Ak:k=mod(floor((index of logical data subcarrier-1)/ 2), 3)+1 mapping the pre-coded symbols to the transmit antennas according to the selected STFBC, and transmitting the mapped symbols through the transmit antennas, where AK(A1=A, A2=B, A3=C) is an antenna grouping pattern for subcarriers, index of logical data subcarrier ranges from 1 to the total number of subcarriers, and the matrices A, B and C are where a row represents symbols for corresponding antenna and a column represents symbols mapped with a subcarrier. 7. The transmitter as claimed in claim 6, wherein the STFBC mapper includes a mapper for mapping the pre-coded symbols to the transmit antennas according to the selected STFBC, and transmitting the mapped symbols through the transmit antennas. 8. The transmitter as claimed in claim 6, wherein the permutation matrix is where a row represents symbols for a corresponding antenna and a column represents symbols mapped with a subcarrier. 9. The transmitter as claimed in claim 7, wherein the permutation matrix is where a row represents symbols for a corresponding antenna and a column represents symbols mapped with a subcarrier. 10.A transmitter with three transmit antennas in a communication system using a space-time-frequency block coding scheme, the transmitter comprising: a pre-coder for pre-coding a symbol vector of an input symbol sequence and outputting pre-coded symbols; and a space-time-frequency block code (STFBC) mapper for selecting an STFBC using a permutation matrix calculated by Ak:k=mod(floor((index of logical data subcarrier-1)/ 2), 3)+1 mapping the pre-coded symbols to the transmit antennas according to the selected STFBC, and transmitting the mapped symbols through the transmit antennas, where Ak(A1=A, A2=B, A3=C) is an antenna grouping pattern for subcarriers, index of logical data subcarrier ranges from 1 to the total number of subcarriers, and the matrices A, B and C are where a row represents symbols for a corresponding antenna and a column represents symbols mapped with a subcarrier. 11. The transmitter as claimed in claim 10, wherein the STFBC mapper includes a mapper for mapping the pre-coded symbols to the transmit antennas according to the selected STFBC, and transmitting the mapped symbols through the transmit antennas. 12.The transmitter as claimed in claim 10, wherein the permutation matrix is where a row represents symbols for a corresponding antenna and a column represents symbols mapped with a subcarrier. 13.The transmitter as claimed in claim 11, wherein the permutation matrix is where a row represents symbols for a corresponding antenna and a column represents symbols mapped with a subcarrier. 14. A method of transmitting a space-time-frequency block code (STFBC) in a transmitter with three transmit antennas, the method comprising the steps of: pre-coding a symbol vector of an input symbol sequence by multiplying the symbol vector by ejθ, θ being a phase rotation angle; reconstructing the symbol vector multiplied with ejθ and outputting pre- coded symbols c1, c2, c3, and c4, given as, c1=x1+jy3 c2=x2+jy4 c3=x3+jy1 c4=x4+jy2 where ck represents a kth pre-coded symbol, xk represents a real term of kth symbol within the symbol vector multiplied with ejθ, and jyk represents an imaginary term of kth symbol within the symbol vector multiplied with ejθ; selecting an STFBC using a permutation matrix in which the following matrices A, B and C are arranged in a predetermined order; mapping the pre-coded symbols to the transmit antennas according to the selected STFBC; and transmitting the mapped symbols through the transmit antennas, where a row represents symbols for a corresponding antenna and a column represents symbols mapped with a subcarrier. 15.The method as claimed in claim 14, wherein the permutation matrix is given by Ak:k=mod(floor((index of logical data subcarrier-1)/ 2), 3)+1 where Ak(A1=A, A2=B, A3=C) is an antenna grouping pattern for subcarriers, index of logical data subcarrier ranges from 1 to the total number of subcarriers. 16.The method as claimed in claim 14, wherein the permutation matrix is where a row represents symbols for corresponding antenna and a column represents symbols mapped with a subcarrier. 17.A method of transmitting a space-time-frequency block code (STFBC) in a transmitter with three transmit antennas, the method comprising the steps of: pre-coding a symbol vector of an input symbol sequence by multiplying the symbol vector by ejθ, θ being a phase rotation angle; reconstructing the symbol vector multiplied with ejθ and outputting pre- coded symbols c1, c2, c3, and c4, given as, c1=x1+jy3 c2=x2+jy4 c3=x3+jy1 c4=x4+jy2 where ck represents a kth pre-coded symbol, xk represents a real term of kth symbol within the symbol vector multiplied with ejθ, and jyk represents an imaginary term of kth symbol within the symbol vector multiplied with ejθ; selecting an STFBC using a permutation matrix calculated; Ak:k=mod(floor((index of logical data subcarrier-1)/ 2), 3)+1 mapping the pre-coded symbols to the transmit antennas according to the selected STFBC; and transmitting the mapped symbols through the transmit antennas, where Ak(A1=A, A2=B, A3=C) is an antenna grouping pattern for subcarriers, index of logical data subcarrier ranges from 1 to the total number of subcarriers, and the matrices A, B and C are where a row represents symbols for a corresponding antenna and a column represents symbols mapped with a subcarrier. 18.The method as claimed in claim 17, wherein the permutation matrix is where a row represents symbols for corresponding antenna and a column represents symbols mapped with a subcarrier. 19. A method of transmitting a space-time-frequency block code (STFBC) in a transmitter with three transmit antennas, the method comprising the steps of: where a row represents symbols for a corresponding antenna and a column represents symbols mapped with a subcarrier, 18.The method as claimed in claim 17, wherein the permutation matrix is where a row represents symbols for corresponding antenna and a column represents symbols mapped with a subcarrier. 19.A method of transmitting a space-time-frequency block code (STFBC) in a transmitter with three transmit antennas, the method comprising the pre-coding a symbol vector of an input symbol sequence and outputting pre-coded symbols; selecting an STFBC using a permutation matrix calculated by; Ak:k=mod(floor((index of logical data subcarrier-1)/ 2), 3)+1 mapping the pre-coded symbols to the transmit antennas according to the selected STFBC; and transmitting the mapped symbols through the transmit antennas, where Ak(A1=A, A2=B, A3=C) is an antenna grouping pattern for subcarriers, index of logical data subcarrier ranges from 1 to the total number of subcarriers, and the matrices A, B and C are where a row represents symbols for a corresponding antenna and a column represents symbols mapped with a subcarrier. 20.The method as claimed in claim 19, wherein the permutation matrix is where a row represents symbols for a corresponding antenna and a column represents symbols mapped with a subcarrier. ABSTRACT TITLE "A TRANSMITTER IN A COMMUNICATION SYSTEM FOR SPACE- TIME- FREQUENCY BLOCK CODING SELECTED BY USING A PERMUTATION MATRIX" A space-time-frequency block coding apparatus and method in a transmitter with three transmit (Tx) antennas are provided. An input symbol sequence is transmitted through three Tx antennas according to a permutation method using a selected transmission matrix in order to improve the performance of an STFBC.

Full Text

WE CLAIM
1. A transmitter with three transmit antennas in a communication system
using a space-time-frequency block coding scheme, the transmitter
comprising:
a pre-coder for pre-coding a symbol vector of an input symbol sequence
by multiplying the symbol vector by ejθ, θ being a phase rotation angle,
reconstructing the symbol vector multiplied with ejθ and outputting pre-
coded symbols c1, c2, c3, and c4, given as,
c1=x1+jy3
c2=x2+jy4
c3=x3+jy1
c4=x4+jy2
where ck represents a kth pre-coded symbol, xk represents a real term of
kth symbol within the symbol vector multiplied with ejθ, and jyk represents
an imaginary term of kth symbol within the symbol vector multiplied with
ejθ; and
a space-time-frequency block code (STFBC) mapper for selecting an
STFBC using a permutation matrix in which the following matrices A, B
and C are arranged in a predetermined order, mapping the pre-coded
symbols to the transmit antennas according to the selected STFBC, and
transmitting the mapped symbols through the transmit antennas,

1
where a row represents symbols for a corresponding antenna and a
column represents symbols mapped with a subcarrier.
2. The transmitter as claimed in claim 1, wherein the STFBC mapper includes
a mapper for mapping the pre-coded symbols to the transmit antennas
according to the selected STFBC and transmitting the mapped symbols
through the transmit antennas.
3. The transmitter as claimed in claim 1, wherein the permutation matrix is
given by
Ak:k=mod(floor((index of logical data subcarrier-1)/
2), 3)+1

where Ak(A1=A, A2=B, A3=C) is an antenna grouping pattern for
subcarriers, index of logical data subcarrier ranges from 1 to the total
number of subcarriers.
4. The transmitter as claimed in claim 1, wherein the permutation matrix is

where a row represents symbols for a corresponding antenna and a
column represents symbols mapped with a subcarrier.
5. The transmitter as claimed in claim 2, wherein the permutation matrix is

where a row represents symbols for a corresponding antenna and a
column represents symbols mapped with a subcarrier.
6. A transmitter with three transmit antennas in a communication system
using a space-time-frequency block coding scheme, the transmitter
comprising:
a pre-coder for pre-coding a symbol vector of an input symbol sequence

by multiplying the symbol vector by ejθ, θ being a phase rotation angle,
reconstructing the symbol vector multiplied with ejθ and outputtihg pre-
coded symbols c1, c2, c3, and c4, given as,
c1=x1+jy3
c2=x2+jy4
c3=x3+jy1
c4=x4+jy2
where ck represents a kth pre-coded symbol, xk represents a real term of
kth symbol within the symbol vector multiplied with x, and jyk represents
an imaginary term of kth symbol within the symbol vector multiplied with
ejθ; and
a space-time-frequency block code (STFBC) mapper for selecting an
STFBC using a permutation matrix calculated by
Ak:k=mod(floor((index of logical data subcarrier-1)/
2), 3)+1
mapping the pre-coded symbols to the transmit antennas according to the
selected STFBC, and transmitting the mapped symbols through the
transmit antennas,
where AK(A1=A, A2=B, A3=C) is an antenna grouping pattern for
subcarriers, index of logical data subcarrier ranges from 1 to the total

number of subcarriers, and the matrices A, B and C are

where a row represents symbols for corresponding antenna and a column
represents symbols mapped with a subcarrier.
7. The transmitter as claimed in claim 6, wherein the STFBC mapper includes
a mapper for mapping the pre-coded symbols to the transmit antennas
according to the selected STFBC, and transmitting the mapped symbols
through the transmit antennas.
8. The transmitter as claimed in claim 6, wherein the permutation matrix is

where a row represents symbols for a corresponding antenna and a
column represents symbols mapped with a subcarrier.
9. The transmitter as claimed in claim 7, wherein the permutation matrix is

where a row represents symbols for a corresponding antenna and a
column represents symbols mapped with a subcarrier.
10.A transmitter with three transmit antennas in a communication system
using a space-time-frequency block coding scheme, the transmitter
comprising:
a pre-coder for pre-coding a symbol vector of an input symbol sequence
and outputting pre-coded symbols; and
a space-time-frequency block code (STFBC) mapper for selecting an
STFBC using a permutation matrix calculated by
Ak:k=mod(floor((index of logical data subcarrier-1)/
2), 3)+1
mapping the pre-coded symbols to the transmit antennas according to the
selected STFBC, and transmitting the mapped symbols through the
transmit antennas,

where Ak(A1=A, A2=B, A3=C) is an antenna grouping pattern for
subcarriers, index of logical data subcarrier ranges from 1 to the total
number of subcarriers, and the matrices A, B and C are

where a row represents symbols for a corresponding antenna and a
column represents symbols mapped with a subcarrier.
11. The transmitter as claimed in claim 10, wherein the STFBC mapper
includes a mapper for mapping the pre-coded symbols to the transmit
antennas according to the selected STFBC, and transmitting the mapped
symbols through the transmit antennas.
12.The transmitter as claimed in claim 10, wherein the permutation matrix is

where a row represents symbols for a corresponding antenna and a
column represents symbols mapped with a subcarrier.
13.The transmitter as claimed in claim 11, wherein the permutation matrix is

where a row represents symbols for a corresponding antenna and a
column represents symbols mapped with a subcarrier.
14. A method of transmitting a space-time-frequency block code (STFBC) in a
transmitter with three transmit antennas, the method comprising the
steps of:
pre-coding a symbol vector of an input symbol sequence by multiplying
the symbol vector by ejθ, θ being a phase rotation angle;
reconstructing the symbol vector multiplied with ejθ and outputting pre-
coded symbols c1, c2, c3, and c4, given as,

c1=x1+jy3
c2=x2+jy4
c3=x3+jy1
c4=x4+jy2
where ck represents a kth pre-coded symbol, xk represents a real term of
kth symbol within the symbol vector multiplied with ejθ, and jyk represents
an imaginary term of kth symbol within the symbol vector multiplied with
ejθ;
selecting an STFBC using a permutation matrix in which the following
matrices A, B and C are arranged in a predetermined order;
mapping the pre-coded symbols to the transmit antennas according to the
selected STFBC; and
transmitting the mapped symbols through the transmit antennas,

where a row represents symbols for a corresponding antenna and a
column represents symbols mapped with a subcarrier.
15.The method as claimed in claim 14, wherein the permutation matrix is
given by
Ak:k=mod(floor((index of logical data subcarrier-1)/
2), 3)+1
where Ak(A1=A, A2=B, A3=C) is an antenna grouping pattern for
subcarriers, index of logical data subcarrier ranges from 1 to the total
number of subcarriers.
16.The method as claimed in claim 14, wherein the permutation matrix is

where a row represents symbols for corresponding antenna and a column
represents symbols mapped with a subcarrier.
17.A method of transmitting a space-time-frequency block code (STFBC) in a
transmitter with three transmit antennas, the method comprising the
steps of:
pre-coding a symbol vector of an input symbol sequence by multiplying

the symbol vector by ejθ, θ being a phase rotation angle;
reconstructing the symbol vector multiplied with ejθ and outputting pre-
coded symbols c1, c2, c3, and c4, given as,
c1=x1+jy3
c2=x2+jy4
c3=x3+jy1
c4=x4+jy2
where ck represents a kth pre-coded symbol, xk represents a real term of
kth symbol within the symbol vector multiplied with ejθ, and jyk represents
an imaginary term of kth symbol within the symbol vector multiplied with
ejθ;
selecting an STFBC using a permutation matrix calculated;
Ak:k=mod(floor((index of logical data subcarrier-1)/
2), 3)+1
mapping the pre-coded symbols to the transmit antennas according to the
selected STFBC; and transmitting the mapped symbols through the
transmit antennas,
where Ak(A1=A, A2=B, A3=C) is an antenna grouping pattern for
subcarriers, index of logical data subcarrier ranges from 1 to the total
number of subcarriers, and the matrices A, B and C are

where a row represents symbols for a corresponding antenna and a
column represents symbols mapped with a subcarrier.
18.The method as claimed in claim 17, wherein the permutation matrix is

where a row represents symbols for corresponding antenna and a column
represents symbols mapped with a subcarrier.
19. A method of transmitting a space-time-frequency block code (STFBC) in a
transmitter with three transmit antennas, the method comprising the
steps of:

where a row represents symbols for a corresponding antenna and a
column represents symbols mapped with a subcarrier,
18.The method as claimed in claim 17, wherein the permutation matrix is

where a row represents symbols for corresponding antenna and a column
represents symbols mapped with a subcarrier.
19.A method of transmitting a space-time-frequency block code (STFBC) in a
transmitter with three transmit antennas, the method comprising the

pre-coding a symbol vector of an input symbol sequence and outputting
pre-coded symbols;
selecting an STFBC using a permutation matrix calculated by;
Ak:k=mod(floor((index of logical data subcarrier-1)/
2), 3)+1
mapping the pre-coded symbols to the transmit antennas according to the
selected STFBC; and
transmitting the mapped symbols through the transmit antennas,
where Ak(A1=A, A2=B, A3=C) is an antenna grouping pattern for
subcarriers, index of logical data subcarrier ranges from 1 to the total
number of subcarriers, and the matrices A, B and C are

where a row represents symbols for a corresponding antenna and a
column represents symbols mapped with a subcarrier.
20.The method as claimed in claim 19, wherein the permutation matrix is

where a row represents symbols for a corresponding antenna and a
column represents symbols mapped with a subcarrier.

ABSTRACT

TITLE "A TRANSMITTER IN A COMMUNICATION SYSTEM FOR SPACE-
TIME- FREQUENCY BLOCK CODING SELECTED BY USING A
PERMUTATION MATRIX"
A space-time-frequency block coding apparatus and method in a transmitter with
three transmit (Tx) antennas are provided. An input symbol sequence is
transmitted through three Tx antennas according to a permutation method using
a selected transmission matrix in order to improve the performance of an STFBC.

A TRANSMITTER IN A COMMUNICATION SYSTEM FOR SPACE-TIME FREQUENCY BLOCK CODING SELECTED BY USING A PERMUTATION MATRIX

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