US 7,508,751 B2
Method and apparatus for transmitting uplink fast feedback information in an OFDMA communication system
Myung-Kwang Byun, Suwon-si (Korea, Republic of); Jae-Ho Jeon, Seongnam-si (Korea, Republic of); Seung-Joo Maeng, Seongnam-si (Korea, Republic of); Jeong-Heon Kim, Anyang-si (Korea, Republic of); Hee-Sang Seo, Seoul (Korea, Republic of); and Jeong-Tae Oh, Yongin-si (Korea, Republic of)
Assigned to Samsung Electronics Co., Ltd., (Korea, Republic of)
Filed on Jun. 01, 2005, as Appl. No. 11/142,708.
Claims priority of application No. 10-2004-0039850 (KR), filed on Jun. 01, 2004.
Prior Publication US 2005/0265227 A1, Dec. 01, 2005
Int. Cl. H04J 11/00 (2006.01); H04L 27/00 (2006.01); H04B 7/00 (2006.01)
U.S. Cl. 370—210  [370/208; 375/259; 455/501] 2 Claims
OG exemplary drawing
 
1. A method for transmitting uplink fast feedback information using a fast feedback channel in a communication system utilizing an orthogonal frequency division multiple access (OFDMA) scheme, the method comprising the steps of:
selecting information data for the uplink fast feedback information;
determining a codeword from a pre-determined codeword set corresponding to the selected information data;
choosing transmission symbols by performing orthogonal modulation according to the determined codeword based on a predetermined modulation pattern;
mapping the chosen transmission symbols into sub-carriers;
performing an inverse fast Fourier transform (IFFT) on the mapped symbols; and
transmitting the IFFT processed mapped symbols,
wherein the determined codeword indicates a set of orthogonal vectors to be used for the orthogonal modulation, and the predetermined modulation pattern is represented by P0, P1, P2, and P3, each of which indicates a quadrature phase shift keying (OPSK) modulation symbol that are expressed by:

OG Complex Work Unit Drawing
wherein the set of orthogonal vectors includes 6 orthogonal vectors from among a predetermined orthogonal vector set, the predetermined orthogonal vector set is represented by:
 
  Subcarrier modulation per codeword
VECTOR INDEX subcarrier 0, subcarrier 1, . . . , subcarrier 7
 
0 P0, P1, P2, P3, P0, P1, P2, P3
1 P0, P3, P2, P1, P0, P3, P2, P1
2 P0, P0, P1, P1, P2, P2, P3, P3
3 P0, P0, P3, P3, P2, P2, P1, P1
4 P0, P0, P0, P0, P0, P0, P0, P0
5 P0, P2, P0, P2, P0, P2, P0, P2
6 P0, P2, P0, P2, P2, P0, P2, P0
7 P0, P2, P2, P0, P2, P0, P0, P2
 
where each of the P0, P1, P2, and P3 is the OPSK modulation symbol, and
wherein the pre-determined codeword set is defined by:
 
Codeword 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
 
A0 0 1 2 3 4 5 6 7 2 3 0 1 6 7 4 5
A1 0 1 2 3 4 5 6 7 4 5 6 7 0 1 2 3
A2 0 1 2 3 4 5 6 7 3 2 1 0 7 6 5 4
A3 0 1 2 3 4 5 6 7 6 7 4 5 2 3 0 1
A4 0 1 2 3 4 5 6 7 7 6 5 4 3 2 1 0
A5 0 1 2 3 4 5 6 7 5 4 7 6 1 0 3 2
 
Codeword 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
 
A0 4 5 6 7 0 1 2 3 3 2 1 0 7 6 5 4
A1 3 2 1 0 7 6 5 4 6 7 4 5 2 3 0 1
A2 6 7 4 5 2 3 0 1 7 6 5 4 3 2 1 0
A3 7 6 5 4 3 2 1 0 5 4 7 6 1 0 3 2
A4 5 4 7 6 1 0 3 2 1 0 3 2 5 4 7 6
A5 1 0 3 2 5 4 7 6 2 3 0 1 6 7 4 5
 
Codeword 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
 
A0 6 7 4 5 2 3 0 1 7 6 5 4 3 2 1 0
A1 7 6 5 4 3 2 1 0 5 4 7 6 1 0 3 2
A2 5 4 7 6 1 0 3 2 1 0 3 2 5 4 7 6
A3 1 0 3 2 5 4 7 6 2 3 0 1 6 7 4 5
A4 2 3 0 1 6 7 4 5 4 5 6 7 0 1 2 3
A5 4 5 6 7 0 1 2 3 3 2 1 0 7 6 5 4
 
Codeword 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
 
A0 5 4 7 6 1 0 3 2 1 0 3 2 5 4 7 6
A1 1 0 3 2 5 4 7 6 2 3 0 1 6 7 4 5
A2 2 3 0 1 6 7 4 5 4 5 6 7 0 1 2 3
A3 4 5 6 7 0 1 2 3 3 2 1 0 7 6 5 4
A4 3 2 1 0 7 6 5 4 6 7 4 5 2 3 0 1
A5 6 7 4 5 2 3 0 1 7 6 5 4 3 2 1 0
 
where a total number of the codewords is 64 expressed by 6 bits, the codewords being designed such that a minimum Hamming distance between the codewords is at least equal to 5, and each of the A0, A1, A2, A3, A4, and A5 represents a vector index in the predetermined orthogonal vector set.