IP Library › Granted Patent US 9,531,576
Granted Patent B2
US 9,531,576 · App. 14/527,401 · Granted Dec 27, 2016

Method and apparatus for transmitting modulation symbol using 256QAM in a wireless access system

Inventors: Bonghoe Kim (Seoul, KR); Dongyoun Seo (Seoul, KR); Joonkui Ahn (Seoul, KR)
Assignee: LG ELECTRONICS INC.
H04L27/362H04L1/0003H04L1/0009H04L5/001H04L5/0007H04L27/3416H04L27/36H04W72/042H04L1/0066H04L5/0048H04L5/0053
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Quick Facts
Patent No.
US 9,531,576
App. No.
14/527,401
Granted
Dec 27, 2016
Kind
B2
Abstract

Disclosed herein is a wireless access system and, more particularly, methods and apparatuses for designing a 256 quadrature amplitude modulation (QAM) constellation point and transmitting a modulation symbol using the same in order to support a 256QAM scheme. The method for transmitting a modulation symbol using a 256 quadrature amplitude modulation (QAM) scheme at a transmitter in a wireless access system includes modulating octuplet bits into one modulation symbol using the 256QAM scheme, mapping the modulation symbol to one of 256QAM constellation points and transmitting the mapped modulation symbol.

Claims (1571)

1. A method for transmitting a modulation symbol using a 256 quadrature amplitude modulation (QAM) scheme at a transmitter in a wireless access system, the method comprising:

modulating octuple bits into one modulation symbol using the 256QAM scheme;

mapping the modulation symbol to one of 256QAM constellation points; and

transmitting the mapped modulation symbol,

wherein the 256QAM constellation points are configured as in the following Table:

TABLE

b(i), . . . , b(i + 7)

I

Q

00000000

5

5

00000001

5

7

00000010

7

5

00000011

7

7

00000100

5

3

00000101

5

1

00000110

7

3

00000111

7

1

00001000

3

5

00001001

3

7

00001010

1

5

00001011

1

7

00001100

3

3

00001101

3

1

00001110

1

3

00001111

1

1

00010000

5

11

00010001

5

9

00010010

7

11

00010011

7

9

00010100

5

13

00010101

5

15

00010110

7

13

00010111

7

15

00011000

3

11

00011001

3

9

00011010

1

11

00011011

1

9

00011100

3

13

00011101

3

15

00011110

1

13

00011111

1

15

00100000

11

5

00100001

11

7

00100010

9

5

00100011

9

7

00100100

11

3

00100101

11

1

00100110

9

3

00100111

9

1

00101000

13

5

00101001

13

7

00101010

15

5

00101011

15

7

00101100

13

3

00101101

13

1

00101110

15

3

00101111

15

1

00110000

11

11

00110001

11

9

00110010

9

11

00110011

9

9

00110100

11

13

00110101

11

15

00110110

9

13

00110111

9

15

00111000

13

11

00111001

13

9

00111010

15

11

00111011

15

9

00111100

13

13

00111101

13

15

00111110

15

13

00111111

15

15

01000000

5

−5

01000001

5

−1

01000010

7

−5

01000011

7

−7

01000100

5

−3

01000101

5

−1

01000110

7

−3

01000111

7

−1

01001000

3

−5

01001001

3

−7

01001010

1

−5

01001011

1

−7

01001100

3

−3

01001101

3

−1

01001110

1

−3

01001111

1

−1

01010000

5

−11

01010001

5

−9

01010010

7

−11

01010011

7

−9

01010100

5

−13

01010101

5

−15

01010110

7

−13

01010111

7

−15

01011000

3

−11

01011001

3

−9

01011010

1

−11

01011011

1

−9

01011100

3

−13

01011101

3

−15

01011110

1

−13

01011111

1

−15

01100000

11

−5

01100001

11

−7

01100010

9

−5

01100011

9

−7

01100100

11

−3

01100101

11

−1

01100110

9

−3

01100111

9

−1

01101000

13

−5

01101001

13

−7

01101010

15

−5

01101011

15

−7

01101100

13

−3

01101101

13

−1

01101110

15

−3

01101111

15

−1

01110000

11

−11

01110001

11

−9

01110010

9

−11

01110011

9

−9

01110100

11

−13

01110101

11

−15

01110110

9

−13

01110111

9

−15

01111000

13

−11

01111001

13

−9

01111010

15

−11

01111011

15

−9

01111100

13

−13

01111101

13

−15

01111110

15

−13

01111111

15

−15

10000000

−5

5

10000001

−5

1

10000010

−7

5

10000011

−7

1

10000100

−5

3

10000101

−5

1

10000110

−7

3

10000111

−7

1

10001000

−3

5

10001001

−3

7

10001010

−1

5

10001011

−1

7

10001100

−3

3

10001101

−3

1

10001110

−1

3

10001111

−1

1

10010000

−5

11

10010001

−5

9

10010010

−7

11

10010011

−7

9

10010100

−5

13

10010101

−5

15

10010110

−7

13

10010111

−7

15

10011000

−3

11

10011001

−3

9

10011010

−1

11

10011011

−1

9

10011100

−3

13

10011101

−3

15

10011110

−1

13

10011111

−1

15

10100000

−11

5

10100001

−11

7

10100010

−9

5

10100011

−9

7

10100100

−11

3

10100101

−11

1

10100110

−9

3

10100111

−9

1

10101000

−13

5

10101001

−13

7

10101010

−15

5

10101011

−15

7

10101100

−13

3

10101101

−13

1

10101110

−15

3

10101111

−15

1

10110000

−11

11

10110001

−11

9

10110010

−9

11

10110011

−9

9

10110100

−11

13

10110101

−11

15

10110110

−9

13

10110111

−9

15

10111000

−13

11

10111001

−13

9

10111010

−15

11

10111011

−15

9

10111100

−13

13

10111101

−13

15

10111110

−15

13

10111111

−15

15

11000000

−5

−5

11000001

−5

−7

11000010

−7

−5

11000011

−7

−7

11000100

−5

−3

11000101

−5

−1

11000110

−7

−3

11000111

−7

−1

11001000

−3

−5

11001001

−3

−7

11001010

−1

−5

11001011

−1

−7

11001100

−3

−3

11001101

−3

−1

11001110

−1

−3

11001111

−1

−1

11010000

−5

−11

11010001

−5

−9

11010010

−7

−11

11010011

−7

−9

11010100

−5

−13

11010101

−5

−15

11010110

−7

−13

11010111

−7

−15

11011000

−3

−11

11011001

−3

−9

11011010

−1

−11

11011011

−1

−9

11011100

−3

−13

11011101

−3

−15

11011110

−1

−13

11011111

−1

−15

11100000

−11

−5

11100001

−11

−7

11100010

−9

−5

11100011

−9

−7

11100100

−11

−3

11100101

−11

−1

11100110

−9

−3

11100111

−9

−1

11101000

−13

−5

11101001

−13

−7

11101010

−15

−5

11101011

−15

−7

11101100

−13

−3

11101101

−13

−1

11101110

−15

−3

11101111

−15

−1

11110000

−11

−11

11110001

−11

−9

11110010

−9

−11

11110011

−9

−9

11110100

−11

−13

11110101

−11

−15

11110110

−9

−13

11110111

−9

−15

11111000

−13

−11

11111001

−13

−9

11111010

−15

−11

11111011

−15

−9

11111100

−13

−13

11111101

−13

−15

11111110

−15

−13

11111111

−15

−15

, where 0 ≦ i ≦ 7, Q denotes an imaginary axis value and I denotes a real-number axis value.

2. The method according to claim 1 , wherein the 256QAM constellation points are configured by arranging 64 64QAM constellation points in a first quadrant of the figure and by imaginary-number axis symmetry, real-number axis symmetry and original symmetry of the 64QAM constellation points.

3. The method according to claim 2 , wherein the transmitter simultaneously manages a first table for supporting a legacy modulation scheme and a second table for supporting a 256QAM scheme.

4. The method according to claim 3 , further comprising:

transmitting, at the transmitter, a higher layer signal including an indicator indicating whether the 256QAM scheme is supported; and

transmitting, at the transmitter to a receiver, a modulation and coding scheme (MCS) index indicating the 256QAM scheme by selecting from the second table.

5. The method according to claim 4 , wherein the MCS index has a size of 5 bits.

6. The method according to claim 2 , wherein the transmitter is a base station and the receiver is a user equipment (UE).

7. A transmitter for transmitting a modulation symbol using a 256 quadrature amplitude modulation (QAM) scheme in a wireless access system, the transmitter comprising:

a transmission unit; and

a processor configured to support the 256QAM scheme,

wherein the processor is configured to:

modulate octuple bits into one modulation symbol using the 256QAM scheme;

map the modulation symbol to one of 256QAM constellation points; and

transmit the mapped modulation symbol using the transmission unit,

wherein the 256QAM constellation points are configured as in the following Table:

TABLE

b(i), . . . , b(i + 7)

I

Q

00000000

5

5

00000001

5

7

00000010

7

5

00000011

7

7

00000100

5

3

00000101

5

1

00000110

7

3

00000111

7

1

00001000

3

5

00001001

3

7

00001010

1

5

00001011

1

7

00001100

3

3

00001101

3

1

00001110

1

3

00001111

1

1

00010000

5

11

00010001

5

9

00010010

7

11

00010011

7

9

00010100

5

13

00010101

5

15

00010110

7

13

00010111

7

15

00011000

3

11

00011001

3

9

00011010

1

11

00011011

1

9

00011100

3

13

00011101

3

15

00011110

1

13

00011111

1

15

00100000

11

5

00100001

11

7

00100010

9

5

00100011

9

7

00100100

11

3

00100101

11

1

00100110

9

3

00100111

9

1

00101000

13

5

00101001

13

7

00101010

15

5

00101011

15

7

00101100

13

3

00101101

13

1

00101110

15

3

00101111

15

1

00110000

11

11

00110001

11

9

00110010

9

11

00110011

9

9

00110100

11

13

00110101

11

15

00110110

9

13

00110111

9

15

00111000

13

11

00111001

13

9

00111010

15

11

00111011

15

9

00111100

13

13

00111101

13

15

00111110

15

13

00111111

15

15

01000000

5

−5

01000001

5

−1

01000010

7

−5

01000011

7

−7

01000100

5

−3

01000101

5

−1

01000110

7

−3

01000111

7

−1

01001000

3

−5

01001001

3

−7

01001010

1

−5

01001011

1

−7

01001100

3

−3

01001101

3

−1

01001110

1

−3

01001111

1

−1

01010000

5

−11

01010001

5

−9

01010010

7

−11

01010011

7

−9

01010100

5

−13

01010101

5

−15

01010110

7

−13

01010111

7

−15

01011000

3

−11

01011001

3

−9

01011010

1

−11

01011011

1

−9

01011100

3

−13

01011101

3

−15

01011110

1

−13

01011111

1

−15

01100000

11

−5

01100001

11

−7

01100010

9

−5

01100011

9

−7

01100100

11

−3

01100101

11

−1

01100110

9

−3

01100111

9

−1

01101000

13

−5

01101001

13

−1

01101010

15

−5

01101011

15

−7

01101100

13

−3

01101101

13

−1

01101110

15

−3

01101111

15

−1

01110000

11

−11

01110001

11

−9

01110010

9

−11

01110011

9

−9

01110100

11

−13

01110101

11

−15

01110110

9

−13

01110111

9

−15

01111000

13

−11

01111001

13

−9

01111010

15

−11

01111011

15

−9

01111100

13

−13

01111101

13

−15

01111110

15

−13

01111111

15

−15

10000000

−5

5

10000001

−5

1

10000010

−7

5

10000011

−7

1

10000100

−5

3

10000101

−5

1

10000110

−7

3

10000111

−7

1

10001000

−3

5

10001001

−3

7

10001010

−1

5

10001011

−1

7

10001100

−3

3

10001101

−3

1

10001110

−1

3

10001111

−1

1

10010000

−5

11

10010001

−5

9

10010010

−7

11

10010011

−7

9

10010100

−5

13

10010101

−5

15

10010110

−7

13

10010111

−7

15

10011000

−3

11

10011001

−3

9

10011010

−1

11

10011011

−1

9

10011100

−3

13

10011101

−3

15

10011110

−1

13

10011111

−1

15

10100000

−11

5

10100001

−11

7

10100010

−9

5

10100011

−9

7

10100100

−11

3

10100101

−11

1

10100110

−9

3

10100111

−9

1

10101000

−13

5

10101001

−13

7

10101010

−15

5

10101011

−15

7

10101100

−13

3

10101101

−13

1

10101110

−15

3

10101111

−15

1

10110000

−11

11

10110001

−11

9

10110010

−9

11

10110011

−9

9

10110100

−11

13

10110101

−11

15

10110110

−9

13

10110111

−9

15

10111000

−13

11

10111001

−13

9

10111010

−15

11

10111011

−15

9

10111100

−13

13

10111101

−13

15

10111110

−15

13

10111111

−15

15

11000000

−5

−5

11000001

−5

−7

11000010

−7

−5

11000011

−7

−7

11000100

−5

−3

11000101

−5

−1

11000110

−7

−3

11000111

−7

−1

11001000

−3

−5

11001001

−3

−7

11001010

−1

−5

11001011

−1

−7

11001100

−3

−3

11001101

−3

−1

11001110

−1

−3

11001111

−1

−1

11010000

−5

−11

11010001

−5

−9

11010010

−7

−11

11010011

−7

−9

11010100

−5

−13

11010101

−5

−15

11010110

−7

−13

11010111

−7

−15

11011000

−3

−11

11011001

−3

−9

11011010

−1

−11

11011011

−1

−9

11011100

−3

−13

11011101

−3

−15

11011110

−1

−13

11011111

−1

−15

11100000

−11

−5

11100001

−11

−7

11100010

−9

−5

11100011

−9

−7

11100100

−11

−3

11100101

−11

−1

11100110

−9

−3

11100111

−9

−1

11101000

−13

−5

11101001

−13

−7

11101010

−15

−5

11101011

−15

−7

11101100

−13

−3

11101101

−13

−1

11101110

−15

−3

11101111

−15

−1

11110000

−11

−11

11110001

−11

−9

11110010

−9

−11

11110011

−9

−9

11110100

−11

−13

11110101

−11

−15

11110110

−9

−13

11110111

−9

−15

11111000

−13

−11

11111001

−13

−9

11111010

−15

−11

11111011

−15

−9

11111100

−13

−13

11111101

−13

−15

11111110

−15

−13

11111111

−15

−15

, where 0 ≦ i ≦ 7, Q denotes an imaginary axis value and I denotes a real-number axis value.

8. The transmitter according to claim 7 , wherein the 256QAM constellation points are configured by arranging 64 64QAM constellation points in a first quadrant and by imaginary-number axis symmetry, real-number axis symmetry and original symmetry of the 64QAM constellation points.

9. The transmitter according to claim 8 , wherein the transmitter simultaneously manages a first table for supporting a legacy modulation scheme and a second table for supporting a 256QAM scheme.

10. The transmitter according to claim 9 , wherein the transmitter controls the transmission unit to transmit a higher layer signal including an indicator indicating whether the 256QAM scheme is supported, and to transmit a modulation and coding scheme (MCS) index indicating the 256QAM scheme by selecting from the second table to a receiver.

11. The transmitter according to claim 10 , wherein the MCS index has a size of 5 bits.

12. The transmitter according to claim 10 , wherein the transmitter is a base station and the receiver is a user equipment (UE).

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 12, 2015
From: KIM, BONGHOE; SEO, DONGYOUN; AHN, JOONKUI
To: LG ELECTRONICS INC.
Reel/Frame 034685/0951 →
Continuity (2)
Provisional Application 61897204 · Oct 29, 2013
Related Publication 20150249564A1 · Sep 3, 2015