Title of Invention  A TRANSMITTER IN A COMMUNICATION SYSTEM FOR SPACETIME FREQUENCY BLOCK CODING SELECTED BY USING A PERMUTATION MATRIX 

Abstract  A spacetimefrequency 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 spacetimefrequency block coding scheme, the transmitter comprising: a precoder for precoding 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 precoded 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 spacetimefrequency 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 precoded 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 precoded 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 subcarrier1)/ 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 spacetimefrequency block coding scheme, the transmitter comprising: a precoder for precoding 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 precoded 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 spacetimefrequency block code (STFBC) mapper for selecting an STFBC using a permutation matrix calculated by Ak:k=mod(floor((index of logical data subcarrier1)/ 2), 3)+1 mapping the precoded 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 precoded 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 spacetimefrequency block coding scheme, the transmitter comprising: a precoder for precoding a symbol vector of an input symbol sequence and outputting precoded symbols; and a spacetimefrequency block code (STFBC) mapper for selecting an STFBC using a permutation matrix calculated by Ak:k=mod(floor((index of logical data subcarrier1)/ 2), 3)+1 mapping the precoded 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 precoded 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 spacetimefrequency block code (STFBC) in a transmitter with three transmit antennas, the method comprising the steps of: precoding 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 precoded 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 precoded 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 subcarrier1)/ 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 spacetimefrequency block code (STFBC) in a transmitter with three transmit antennas, the method comprising the steps of: precoding 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 precoded 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 subcarrier1)/ 2), 3)+1 mapping the precoded 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 spacetimefrequency 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 spacetimefrequency block code (STFBC) in a transmitter with three transmit antennas, the method comprising the precoding a symbol vector of an input symbol sequence and outputting precoded symbols; selecting an STFBC using a permutation matrix calculated by; Ak:k=mod(floor((index of logical data subcarrier1)/ 2), 3)+1 mapping the precoded 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 spacetimefrequency 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. 

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449KOLNP2007INTERNATIONAL SEARCH REPORT & OTHERS.pdf
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Patent Number  257699  

Indian Patent Application Number  449/KOLNP/2007  
PG Journal Number  44/2013  
Publication Date  01Nov2013  
Grant Date  28Oct2013  
Date of Filing  07Feb2007  
Name of Patentee  SAMSUNG ELECTRONICS CO. LTD.  
Applicant Address  416, MAETANDONG, YEONGTONGGU, SUWONSI, GYEONGGIDO,  
Inventors:


PCT International Classification Number  H04B 7/06  
PCT International Application Number  PCT/KR2005/002679  
PCT International Filing date  20050817  
PCT Conventions:
