DEVICE AND METHOD FOR PERFORMING NON-ORTHOGONAL MULTIPLEXING

• US 20160056932A1
• Filed: 08/07/2015
• Published: 02/25/2016
• Est. Priority Date: 08/22/2014
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: KUSUNOKI, Shigeo
• Granted Patent: US 9,930,671 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/0678 using different spreading codes between antennas code allocation H04J13/16
• CPC Class Codes: H04J 11/00 Orthogonal multiplex systems, e.g. using WALSH codesH04J13/00 takes precedence
• CPC Class Codes: H04J 13/0048 Walsh
• CPC Class Codes: H04J 2011/0006 with CDM/CDMA
• CPC Class Codes: H04L 5/0016 Time-frequency-code
• CPC Class Codes: H04L 5/0042 intra-user or intra-terminal allocation
• CPC Class Codes: H04W 72/0466 the resource being a scrambling code

Abstract

A device includes circuitry configured to spread one or more symbols with one or more orthogonal codes into spread signals having a predetermined number of bits. The amplitude of the spread signals is modified via one or more layer coefficients and the spread signals are multiplexed into a layered transmit signal.

Claims

1. A device comprising:

circuitry configured to

spread one or more symbols with one or more orthogonal codes into spread signals having a predetermined number of bits,

modify an amplitude of the spread signals via one or more layer coefficients, and

multiplex the spread signals into a layered transmit signal.

2. The device of claim 1, wherein the circuitry is further configured to allocate the layered transmit signal to a predetermined number of subcarriers.

3. The device of claim 2, wherein the predetermined number of subcarriers corresponds to the predetermined number of bits of the spread signal.

4. The device of claim 1, wherein the one or more orthogonal codes are Walsh codes.

5. The device of claim 1, wherein the circuitry is further configured to determine the layer coefficients based on a coefficient difference factor that is less than one.

6. The device of claim 5, wherein the circuitry is further configured determine a highest layer coefficient to be greater than a sum of one or more remaining lower layer coefficients.

7. The device of claim 5, wherein the circuitry is further configured to reduce a physical layer bit error rate by increasing the coefficient difference factor.

8. The device of claim 1, wherein the circuitry is further configured to modify a total transmit power by modifying at least one of a sum of the layer coefficients or the predetermined number of bits of the spread signal.

9. The device of claim 1, wherein the circuitry is further configured to reduce a total transmit power for the layered transmit signal by adding an offset to at least one of the one or more layer coefficients.

10. The device of claim 9, wherein the circuitry is further configured to add the offset to alternating layers of the layered transmit signal.

11. The device of claim 10, wherein the offset is equal to 45 degrees.

12. The device of claim 1, wherein the layered transmit signal includes one or more non-orthogonal signal layers.

13. The device of claim 12, wherein the circuitry is further configured to reduce interference between the one or more non-orthogonal signal layers by modifying the amplitude of the spread signals with the one or more layer coefficients.

14. The device of claim 1, wherein the circuitry is further configured to implement quadrature amplitude modulation for a first layer and phase-shift keying modulation for second and higher layers of the layered transmit signal.

15. The device of claim 1, wherein the circuitry is further configured to allocate signals from one terminal device to four subcarriers of a twelve-subcarrier resource block.

16. The device of claim 1, wherein the circuitry is further configured to recover a highest received signal layers by reverse spreading a received signal with the one or more orthogonal codes.

17. The device of claim 16, wherein the circuitry is further configured to re-spread the highest received signal layer with the one or more orthogonal codes and multiply a corresponding spread signal by an associated layer coefficient.

18. The device of claim 17, wherein the circuitry is further configured to subtract a re-spread signal from the received signal to recover one or more lower received signal layers.

19. A method comprising:

spreading one or more symbols with one or more orthogonal codes into spread signals having a predetermined number of bits;

modifying an amplitude of the spread signals via one or more layer coefficients; and

multiplexing the spread signals into a layered transmit signal.

20. A device comprising:

circuitry configured to

recover a highest received signal layer by reverse spreading a received signal with the one or more orthogonal codes,

re-spread the highest received signal layer with one or more orthogonal codes and multiply a corresponding spread signal by an associated layer coefficient, and

subtract a re-spread signal from the received signal to recover one or more lower received signal layers.