US 7,606,320 B2
Apparatus and method for space-frequency block coding/decoding in a communication system
Chan-Byoung Chae, Seoul (Korea, Republic of); Hong-Sil Jeong, Seoul (Korea, Republic of); Young-Kwon Cho, Suwon-si (Korea, Republic of); Dong-Seek Park, Yongin-si (Korea, Republic of); and Katz Marcos Daniel, Suwon-si (Korea, Republic of)
Assigned to Samsung Electronics Co., Ltd., (Korea, Republic of)
Filed on Jun. 20, 2005, as Appl. No. 11/156,689.
Claims priority of application No. 10-2004-0045526 (KR), filed on Jun. 18, 2004.
Prior Publication US 2005/0281350 A1, Dec. 22, 2005
Int. Cl. H04B 7/02 (2006.01)
U.S. Cl. 375—267  [375/299; 375/341; 375/347; 375/349; 375/135; 375/136; 375/146; 375/147] 23 Claims
OG exemplary drawing
 
1. A transmitter using a plurality of (Nt) transmit antennas in a communication system, comprising:
a pre-coder for pre-coding an input symbol sequence using a pre-coding matrix, the pre-coding matrix being produced by puncturing a unitary matrix in a predetermined method; and
a space-frequency coder for generating a plurality of vectors by grouping the symbols of the pre-coded symbol sequence by twos, space-frequency mapping each of the vectors by encoding each of the vectors in an Alamouti coding scheme, and providing each of the space-frequency mapped symbols to a predetermined Orthogonal Frequency Division Multiplexing (OFDM) modulator;
wherein if a number of the transmit antennas is an even number (Nt=even number), the pre-coding matrix is

OG Complex Work Unit Drawing
where ai=exp(2π(i1/4)/Nt), i=,0, 1,2, . . . ,Nt/2−1, andwherein the pre-coding matrix is produced by puncturing predetermined

OG Complex Work Unit Drawing
columns in an Nt×Nt Vandermonde matrix, sequentially grouping the rows of the punctured matrix by twos, and shifting one row of each group.