APPARATUS AND METHOD FOR TRANSMITTING SIGNAL, APPARATUS AND METHOD FOR RECEIVING SIGNAL

• US 20160204972A1
• Filed: 12/23/2015
• Published: 07/14/2016
• Est. Priority Date: 01/12/2015
• Status: Active Grant

• Current Assignee: Gangneung-Wonju National University Industry Academy Cooperation Group
• Original Assignee: Gangneung-Wonju National University Industry Academy Cooperation Group
• Inventors: Park, Sung Joon
• Granted Patent: US 9,602,326 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 27/0012 arrangements for identifying the type of modulation
• CPC Class Codes: H04L 27/3433 using an underlying square constellation
• CPC Class Codes: H04L 27/3455 in order to facilitate carrier recovery at the receiver end, e.g. by transmitting a pilot or by using additional signal points to allow the detection of rotations
• CPC Class Codes: H04L 27/36 Modulator circuits; Transmitter circuits
• CPC Class Codes: H04L 27/362 Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated H04L27/366 takes precedence
• CPC Class Codes: H04L 27/38 Demodulator circuits; Receiver circuits

Abstract

An apparatus for transmitting a signal in accordance with an embodiment of the present invention includes a mapper configured to map a modulation symbol to a bit signal by referencing the constellation. The constellation includes a plurality of blocks, and each block includes constellation points, each of which has in-phase (I) axis component value and quadrature-phase (Q) axis component value whose difference from the I axis or Q axis component value of a reference point of the block is a first difference value or a second difference value.

Claims

1. An apparatus for transmitting a signal, comprising:

a constellation providing part having a constellation stored therein;

a mapper configured to map a modulation symbol to a bit signal by referencing the constellation; and

a transmitting part configured to generate a signal corresponding to the modulation symbol and transmit the signal to a receiving apparatus,

wherein the constellation includes a plurality of blocks, each of which includes 4 constellation points, and each block includes constellation points, each of which has an in-phase (I) axis component value whose difference from the I axis component value of a reference point of the block is a first difference value or a second difference value and has a quadrature-phase (Q) axis component value whose difference from the Q axis component value of the reference point of the block is the first difference value or the second difference value.

2. The apparatus as set forth in claim 1, wherein the reference point is a point included in each block whose I axis and Q axis component value is the smallest.

3. The apparatus as set forth in claim 1, wherein a value obtained by having the second difference value divided by the first difference value is greater than 1 and smaller than 3, or is greater than 3, and

wherein a value obtained by adding the first difference value to the second difference value is a latitudinal or longitudinal length of the block.

4. The apparatus as set forth in claim 1, wherein the constellation providing part is configured to generate the constellation having the first difference value and the second difference value configured therein according to at least one of an input by a user, a channel state and a transmitting method of the signal.

5. An apparatus for receiving a signal, comprising:

a receiving part configured to receive a signal;

a demapper configured to extract a reception symbol from the signal;

a constellation providing part having a constellation stored therein;

a log-likelihood ratio computing part configured to compute a log-likelihood ratio corresponding to the reception symbol by referencing the constellation; and

a decoding part configured to decode the reception symbol based on the log-likelihood ratio,

wherein the constellation includes a plurality of blocks, each of which includes 4 constellation points, and each block includes constellation points, each of which has an in-phase (I) axis component value whose difference from the I axis component value of a reference point of the block is a first difference value or a second difference value and has a quadrature-phase (Q) axis component value whose difference from the Q axis component value of the reference point of the block is the first difference value or the second difference value.

6. The apparatus as set forth in claim 5, wherein the reference point is a point included in each block whose I axis and Q axis component value is the smallest.

7. The apparatus as set forth in claim 5, wherein a value obtained by having the second difference value divided by the first difference value is greater than 1 and smaller than 3, or is greater than 3, and

wherein a value obtained by adding the first difference value to the second difference value is a latitudinal or longitudinal length of the block.

8. The apparatus as set forth in claim 5, wherein the constellation providing part is configured to generate the constellation based on a difference value ratio included in the signal or based on the first difference value and the second difference value.

9. A method of transmitting a signal by an apparatus for transmitting a signal, comprising:

mapping a modulation symbol to a bit signal by referencing a constellation; and

generating a signal corresponding to the modulation symbol and transmitting the generated signal to a receiving apparatus,

wherein the constellation includes a plurality of blocks, each of which includes 4 constellation points, and each block includes constellation points, each of which has an in-phase (I) axis component value whose difference from the I axis component value of a reference point of the block is a first difference value or a second difference value and has a quadrature-phase (Q) axis component value whose difference from the Q axis component value of the reference point of the block is the first difference value or the second difference value.

10. The method as set forth in claim 9, wherein the reference point is a point included in each block whose I axis and Q axis component value is the smallest.

11. The method as set forth in claim 9, wherein a value obtained by having the second difference value divided by the first difference value is greater than 1 and smaller than 3, or is greater than 3, and

wherein a value obtained by adding the first difference value to the second difference value is a latitudinal or longitudinal length of the block.

12. A method of receiving a signal by an apparatus for receiving a signal, comprising:

extracting a reception symbol from a signal;

computing a log-likelihood ratio corresponding to the reception symbol by referencing a constellation; and

decoding the reception symbol according to the log-likelihood,

wherein the constellation includes a plurality of blocks, each of which includes 4 constellation points, and each block includes constellation points, each of which has an in-phase (I) axis component value whose difference from the I axis component value of a reference point of the block is a first difference value or a second difference value and has a quadrature-phase (Q) axis component value whose difference from the Q axis component value of the reference point of the block is the first difference value or the second difference value.

13. The method as set forth in claim 12, wherein the reference point is a point included in each block whose I axis and Q axis component value is the smallest.

14. The method as set forth in claim 12, wherein a value obtained by having the second difference value divided by the first difference value is greater than 1 and smaller than 3, or is greater than 3, and

wherein a value obtained by adding the first difference value to the second difference value is a latitudinal or longitudinal length of the block.