Method and apparatus for quadrature signal modulation

• US 9,794,104 B1
• Filed: 04/11/2016
• Issued: 10/17/2017
• Est. Priority Date: 03/31/2016
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Montorsi, Guido, Benedetto, Sergio, Xin, Yan, Yan, Min
• Primary Examiner(s): Puente, Eva
• Application Number:
  US15/095,787
• Publication Number:
  US 20170288935A1
• Time in Patent Office: 554 Days
• Field of Search: 375298, 455296
• CPC Class Codes: H03M 13/152 Bose-Chaudhuri-Hocquenghem [BCH] codes
• CPC Class Codes: H04B 1/02 Transmitters
• CPC Class Codes: H04L 27/3422 in which the constellation is not the n - fold Cartesian product of a single underlying two-dimensional constellation
• CPC Class Codes: H04L 27/36 Modulator circuits; Transmitter circuits

Abstract

Methods and apparatus for facilitating wireless communication using digital Quadrature Amplitude Modulation are disclosed. A mapping module electronic component of a wireless communication device utilizes a signal constellation for quadrature modulating a signal for transmission or quadrature demodulating a received signal. The signal constellation includes multiple constellation symbols and associated bit sequences. Specific signal constellations are disclosed. The signal constellations may be obtained through an optimization procedure which accounts for both phase noise and power amplifier nonlinearity.

Claims

1. A method for wireless communication using digital Quadrature Amplitude Modulation (QAM), the method comprising:

translating between constellation symbols and bit sequences corresponding to the constellation symbols using a mapping module electronic component of a wireless communication device, in accordance with a 64-point constellation;

wherein normalized magnitudes of the constellation symbols in a first quadrant of the 64-point constellation are defined by the following coordinate pairs to at least three decimal places of precision;

2. The method of claim 1, wherein normalized magnitudes of the constellation symbols in the first quadrant of the 64-point constellation are defined by the coordinate pairs to at least four decimal places of precision.

3. The method of claim 1, wherein normalized magnitudes of the constellation symbols in the first quadrant of the 64-point constellation are defined by the coordinate pairs to at least five decimal places of precision.

4. The method of claim 1, wherein normalized magnitudes of the constellation symbols in the first quadrant of the 64-point constellation are defined by the coordinate pairs to six decimal places of precision.

5. The method of claim 1, wherein the constellation is a reflection-symmetric constellation.

6. The method of claim 1, wherein:

the first coordinates of the coordinate pairs represent normalized magnitudes of one of;

in-phase components; and

quadrature components of the constellation symbols, and

the second coordinates of the coordinate pairs represent normalized magnitudes of the other one of the in-phase components and the quadrature components of the constellation symbols.

7. The method of claim 1, wherein the bit sequences are assigned to the constellation symbols using Gray mapping.

8. The method of claim 1, wherein each of the bit sequences is of length 6 bits, including 4 quadrant non-specific bits, and wherein, for an index value k ranging from k=1 to k=16 inclusive:

the quadrant non-specific bits of the bit sequence corresponding to the constellation symbol defined by a k^th-listed one of the coordinate pairs are equal to;

a binary representation of k−

1;

the binary representation of k−

1 added to a constant value under Modulo-16 addition;

the binary representation of k−

1 subjected to a consistent bit reordering, or the binary representation of k−

1 added to a constant value under Modulo-16 addition and subjected to the consistent bit reordering.

9. The method of claim 8, wherein the constellation is a reflection symmetric constellation, and wherein bit sequences corresponding to constellation symbols within a common group of reflection symmetric constellation symbols have identical quadrant non-specific bits.

10. An apparatus for a wireless communication device configured for wireless communication using digital Quadrature Amplitude Modulation (QAM), the apparatus comprising:

a mapping module electronic component configured to translate between constellation symbols and bit sequences corresponding to the constellation symbols in accordance with a 64-point constellation;

wherein normalized magnitudes of the constellation symbols in a first quadrant of the 64-point constellation are defined by the following coordinate pairs to at least three decimal places of precision;

11. The apparatus of claim 10, wherein normalized magnitudes of the constellation symbols in the first quadrant of the 64-point constellation are defined by the coordinate pairs to at least four decimal places of precision.

12. The apparatus of claim 10, wherein normalized magnitudes of the constellation symbols in the first quadrant of the 64-point constellation are defined by the coordinate pairs to at least five decimal places of precision.

13. The apparatus of claim 10, wherein normalized magnitudes of the constellation symbols in the first quadrant of the 64-point constellation are defined by the coordinate pairs to six decimal places of precision.

14. The apparatus of claim 10, wherein the constellation is a reflection-symmetric constellation.

15. The apparatus of claim 10, wherein the left-hand-side coordinates the coordinate pairs represent normalized magnitudes of one of:

in-phase components; and

quadrature components of the constellation symbols, and the right-hand-side coordinates of the coordinate pairs represent normalized magnitudes of the other one of the in-phase components and the quadrature components of the constellation symbols.

16. The apparatus of claim 10, wherein the bit sequences are assigned to the constellation symbols using Gray mapping.

17. The apparatus of claim 10, wherein each of the bit sequences is of length 6 bits, including 4 quadrant non-specific bits, and wherein, for an index value k ranging from k=1 to k=16 inclusive:

the quadrant non-specific bits of the bit sequence corresponding to the constellation symbol defined by a k^th-listed one of the coordinate pairs are equal to;

a binary representation of k−

1;

the binary representation of k−

1 added to a constant value under Modulo-16 addition;

the binary representation of k−

1 subjected to a consistent bit reordering, or the binary representation of k−

1 added to a constant value under Modulo-16 addition and subjected to the consistent bit reordering.

18. The apparatus of claim 17, wherein the constellation is a reflection symmetric constellation, and wherein bit sequences corresponding to constellation symbols within a common group of reflection symmetric constellation symbols have identical quadrant non-specific bits.