Device and method for performing non-orthogonal multiplexing

• US 10,555,308 B2
• Filed: 03/26/2018
• Issued: 02/04/2020
• 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
• Primary Examiner(s): Chowdhury, Harun
• Application Number:
  US15/935,298
• Publication Number:
  US 20180213535A1
• Time in Patent Office: 680 Days
• Field of Search: 370208, 370209, 370329, 370330, 375144, 375267
• 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 symbols into spread signals having a predetermined number of bits,

change an amplitude of the spread signals via layer coefficients, and

multiplex the amplitude modified spread signals into a layered transmit signal; and

a communication interface configured to transmit the layered transmit signal, wherein

the circuitry is configured to

determine a highest layer coefficient to be greater than a sum of a plurality of remaining lower layer coefficients.

2. 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, and

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 circuitry is further configured to reduce a physical layer bit error rate by increasing the coefficient difference factor.

5. 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.

6. 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 layer coefficients.

7. The device of claim 6, wherein the circuitry is further configured to add the offset to alternating layers of the layered transmit signal.

8. The device of claim 1, wherein the circuitry is further configured to reduce interference between the signal layers by modifying the amplitude of the spread signals with the layer coefficients.

9. 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.

10. 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.

11. The device of claim 1, wherein the circuitry is further configured to recover a highest received signal layers by reverse spreading a received signal.

12. A device comprising:

circuitry configured to

spread symbols into spread signals having a predetermined number of bits,

change an amplitude of the spread signals via layer coefficients, and

multiplex the amplitude modified spread signals into a layered transmit signal; and

a communication interface configured to transmit the layered transmit signal, wherein

the circuitry is configured to

recover a highest received signal layer by reverse spreading a received signal, and

re-spread the highest received signal layer and multiply a corresponding spread signal by an associated layer coefficient.

13. The device of claim 12, 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.

14. A method comprising:

spreading symbols into spread signals having a predetermined number of bits;

changing an amplitude of the spread signals via layer coefficients; and

multiplexing the amplitude modified spread signals into a layered transmit signal;

transmitting the layered transmit signal, wherein

a highest layer coefficient is determined to be greater than a sum of a plurality of remaining lower layer coefficients.

15. The method of claim 14, further comprising:

determining the layer coefficients based on a coefficient difference factor that is less than one, and

allocating the layered transmit signal to a predetermined number of subcarriers.

16. The method of claim 15, wherein the predetermined number of subcarriers corresponds to the predetermined number of bits of the spread signal.

17. The method of claim 14, further comprising:

reducing a physical layer bit error rate by increasing the coefficient difference factor.

18. The method of claim 14, further comprising:

modifying 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.

19. The method of claim 14, further comprising:

reducing a total transmit power for the layered transmit signal by adding an offset to at least one of the layer coefficients.

20. The method of claim 19, further comprising:

adding the offset to alternating layers of the layered transmit signal.