METHOD AND APPARATUS FOR FLEXIBLE SPARSE CODE MULTIPLE ACCESS CODEBOOK DESIGN, TRANSMISSION AND DETECTION

• US 20190044571A1
• Filed: 10/10/2018
• Published: 02/07/2019
• Est. Priority Date: 05/20/2016
• 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: Taherzadeh Boroujeni, Mahmoud, Bayesteh, Alireza, Baligh, Mohammadhadi
• Granted Patent: US 10,454,519 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 2201/709718 Determine interference
• CPC Class Codes: H04J 2011/0009 with FDM/FDMA
• CPC Class Codes: H04L 65/40 Support for services or applications

Abstract

Forward error correction encoding is applied to a first stream of input bits associated with a first data layer to generate a first stream of coded bits. The first steam of coded bits is mapped to K1 binary streams. A first layer-specific set of stream-specific modulators are applied to the K1 binary streams to generate K1 independent complex-valued symbol streams. The symbol streams are transmitted using T1 resource elements out of N1 resource elements. The T1 resource elements are defined by a first layer-specific signature of length N1, where 1≤T1<N1. The same process may also be carried out for a second stream of input bits associated with a second data layer using a second layer-specific set of stream-specific modulators and a second layer-specific signature, which may differ from the first layer-specific signature in terms of sparsity pattern and/or sparsity level.

Claims

1. A method comprising:

mapping a first stream of coded bits associated with a first data layer to K₁ binary streams;

applying a first layer-specific set of stream-specific modulators to the K₁ binary streams to generate K₁ independent complex-valued symbol streams; and

transmitting the K₁ independent complex-valued symbol streams using T₁ resource elements out of N₁ resource elements, the T₁ resource elements being defined by a first layer-specific signature of length N₁, where 1≤

T₁<

N₁.

2. The method of claim 1, wherein at least one of the first layer-specific signature and the first layer-specific set of stream-specific modulators is selected based at least in part on at least one of:

a layer index associated with the first data layer, a coding rate of a forward error correction (FEC) encoding applied to the first stream of coded bits, or a target spectral efficiency.

3. The method of claim 1, wherein the T₁ resource elements out of N₁ resource elements comprise T₁ tones out of N₁ orthogonal frequency-division multiplexing (OFDM) tones.

4. The method of claim 1, wherein the stream-specific modulators are applied by quadrature amplitude modulation (QAM) mappers.

5. The method of claim 1, wherein mapping the first stream of coded bits to K₁ binary streams comprises mapping the first stream of coded bits to K₁ binary streams such that at least one coded bit is mapped to more than one of the K₁ binary streams and none of the K₁ binary streams are identical to each other.

6. The method of claim 1, wherein mapping the first stream of coded bits to K₁ binary streams comprises dividing the first stream of coded bits to K₁ disjoint binary streams.

7. The method of claim 1, further comprising assigning stream-specific transmit powers to the K₁ independent complex-valued symbol streams prior to transmission.

8. The method of claim 1, further comprising assigning stream-specific phase rotations to the K₁ independent complex-valued symbol streams prior to transmission.

9. The method of claim 1, further comprising:

mapping a second stream of coded bits associated with a second data layer to K₂ binary streams;

applying a second layer-specific set of stream-specific modulators to the K₂ binary streams to generate K₂ independent complex-valued symbol streams; and

transmitting the K₂ independent complex-valued symbol streams using T₂ resource elements out of N₂ resource elements, the T₂ resource elements being defined by a second layer-specific signature of length N₂, where 1≤

T₂≤

N₂,

wherein the first and second layer-specific signatures differ in at least one of sparsity pattern and sparsity level.

10. The method of claim 9, wherein the first and second layer-specific sets of stream-specific modulators differ in at least one of a sequence of the stream-specific modulators in each set and a proportion of different stream-specific modulators in each set.

11. The method of claim 9, further comprising assigning at least one of layer-specific transmit powers and layer-specific phase rotations to the independent complex-valued symbol streams prior to transmission.

12. The method of claim 9, wherein the first data layer and the second data layer are transmitted by a user equipment UE1.

13. The method of claim 9, wherein the first data layer is transmitted by a first user equipment UE1 and the second data layer is transmitted by a second user equipment UE2.

14. The method of claim 1, wherein the first data layer is transmitted by a user equipment UE1.

15. The method of claim 1, further comprising selecting the T₁ resource elements out of the N₁ resource elements corresponding to the first layer-specific signature generated using optical orthogonal codes (OOCs).

16. An apparatus comprising:

a bit mapper configured to map a first stream of coded bits associated with a first data layer to K₁ binary streams;

a first layer-specific set of stream-specific modulators, operatively coupled to the bit mapper, configured to generate K₁ independent complex-valued symbol streams based on the K₁ binary streams; and

a transmitter, operatively coupled to the first layer-specific set of stream-specific modulators, configured to transmit the K₁ independent complex-valued symbol streams using T₁ resource elements out of N₁ resource elements, the T₁ resource elements being defined by a first layer-specific signature of length N₁, where 1≤

T₁<

N₁.

17. The apparatus of claim 16, further comprising a controller to configure the bit mapper and the first layer-specific set of stream-specific modulators based at least in part on at least one of:

a layer index associated with the first data layer, a coding rate of a forward error correction (FEC) encoding applied to the first stream of coded bits, or a target spectral efficiency.

18. The apparatus of claim 16, wherein the T₁ resource elements out of N₁ resource elements comprise T₁ tones out of N₁ orthogonal frequency-division multiplexing (OFDM) tones.

19. The apparatus of claim 16, wherein the stream-specific modulators are quadrature amplitude modulation (QAM) mappers.

20. The apparatus of claim 16, wherein the bit mapper maps the first stream of coded bits to K₁ binary streams such that at least one coded bit is mapped to more than one of the K₁ binary streams and none of the K₁ binary streams are identical to each other.

21. The apparatus of claim 16, wherein the bit mapper divides the first stream of coded bits to K₁ disjoint binary streams.

22. The apparatus of claim 16, further comprising a power scaler, operatively coupled between the modulators and the transmitter, configured to assign stream-specific transmit powers to the K₁ independent complex-valued symbol streams prior to transmission.

23. The apparatus of claim 16, further comprising a phase rotator, operatively coupled between the modulators and the transmitter, configured to assign stream-specific phase rotations to the K₁ independent complex-valued symbol streams prior to transmission.

24. The apparatus of claim 16, further comprising:

a second bit mapper configured to map a second stream of coded bits associated with a second data layer to K₂ binary streams;

a second layer-specific set of stream-specific modulators, operatively coupled to the second bit mapper, configured to generate K₂ independent complex-valued symbol streams based on the K₂ binary streams;

wherein the transmitter is operatively coupled to the second layer-specific set of stream-specific modulators and transmits the K₂ independent complex-valued symbol streams using T₂ resource elements out of N₂ resource elements, the T₂ resource elements being defined by a second layer-specific signature of length N₂, where 1≤

T₂≤

N₂ and the first and second layer-specific signatures differ in at least one of sparsity pattern and sparsity level.

25. The apparatus of claim 24, wherein the first and second layer-specific sets of stream-specific modulators differ in at least one of a sequence of the stream-specific modulators in each set and a proportion of different stream-specific modulators in each set.

26. The apparatus of claim 24, further comprising:

a first power scaler, operatively coupled between the first layer-specific set of stream-specific modulators and the transmitter, configured to assign a first layer-specific vector of stream-specific transmit powers to the K₁ independent complex-valued symbol streams prior to transmission; and

a second power scaler, operatively coupled between the second layer-specific set of stream-specific modulators and the transmitter, configured to assign a second layer-specific vector of stream-specific transmit powers to the K₂ independent complex-valued symbol streams prior to transmission.

27. The apparatus of claim 24, further comprising:

a first phase rotator, operatively coupled between the first layer-specific set of stream-specific modulators and the transmitter, configured to assign a first layer-specific vector of stream-specific phase rotations to the K₁ independent complex-valued symbol streams prior to transmission; and

a second phase rotator, operatively coupled between the second layer-specific set of stream-specific modulators and the transmitter, configured to assign a second layer-specific vector of stream-specific phase rotations to the K₁ independent complex-valued symbol streams prior to transmission.

28. The apparatus of claim 24, wherein the apparatus is a user equipment UE1.

29. The apparatus of claim 16, wherein the apparatus is a user equipment UE1.

30. The apparatus of claim 16, wherein the apparatus is a first user equipment UE1, and wherein a second layer is transmitted by a second user equipment UE2.

31. The apparatus of claim 16, further comprising a controller configured to select the T₁ resource elements out of the N₁ resource elements corresponding to the first layer-specific signature generated using optical orthogonal codes (OOCs).