DUAL CARRIER MODULATION THAT MITIGATES PAPR

• US 20170295049A1
• Filed: 04/12/2017
• Published: 10/12/2017
• Est. Priority Date: 04/12/2016
• Status: Abandoned Application

• Current Assignee: NXP USA, Inc. (NXP Semiconductors NV)
• Original Assignee: Marvell World Trade Limited (Marvell Technology Group Limited)
• Inventors: SUN, Yakun, ZHANG, Hongyuan, ZHANG, Yan
• Application Number:
  US15/486,196
• Publication Number:
  US 20170295049A1
• Time in Patent Office: Days
• CPC Class Codes: H04L 1/0042 Encoding specially adapted to other signal generation operation, e.g. in order to reduce transmit distortions, jitter, or to improve signal shape H04L1/0067 takes precedence
• CPC Class Codes: H04L 1/04 using frequency diversity
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 27/183 Multiresolution systems
• CPC Class Codes: H04L 27/2621 Reduction thereof using phase offsets between subcarriers
• CPC Class Codes: H04L 27/28 with simultaneous transmission of different frequencies each representing one code element
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 69/323 in the physical layer [OSI layer 1]
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A communication device maps a plurality of bits to a first set of transmission symbols corresponding to a first set of subcarriers within a component communication channel. Transmission symbols among the first set of transmission symbols correspond to respective subsets of one or more bits, and transmission symbols among the first set of transmission symbols are single carrier transmission symbols. The communication device maps the plurality of bits to a second set of transmission symbols corresponding to a second set of subcarriers within the component communication channel. At least a subset of multiple transmission symbols in the second set of transmission symbols correspond to phase adjusted versions of transmission symbols in a corresponding at least a subset of multiple transmission symbols in the first set of transmission symbols. The communication device generates a transmission signal using the first set of transmission symbols and the second set of transmission symbols.

Claims

1. A method, comprising:

mapping, at a communication device, a plurality of bits to a first set of transmission symbols corresponding to a first set of subcarriers within a component communication channel, wherein transmission symbols among the first set of transmission symbols correspond to respective subsets of one or more bits, and transmission symbols among the first set of transmission symbols are single carrier transmission symbols;

mapping, at the communication device, the plurality of bits to a second set of transmission symbols corresponding to a second set of subcarriers within the component communication channel, wherein at least a subset of multiple transmission symbols in the second set of transmission symbols corresponds to phase adjusted versions of transmission symbols in a corresponding at least a subset of multiple transmission symbols in the first set of transmission symbols; and

generating, at the communication device, a transmission signal for transmission in a communication network using the first set of transmission symbols and the second set of transmission symbols.

2. The method of claim 1, wherein mapping the plurality of bits to the second set of transmission symbols comprises:

mapping the plurality of bits to the second set of transmission symbols such that all transmission symbols in the second set of transmission symbols correspond to phase adjusted versions of transmission symbols in the first set of transmission symbols.

3. The method of claim 2, wherein all transmission symbols in the second set of transmission symbols are adjusted by a same phase as compared to transmission symbols in the first set of transmission symbols.

4. The method of claim 3, wherein the same phase is π

/2 radians.

5. The method of claim 1, wherein mapping the plurality of bits to the second set of transmission symbols comprises:

mapping the plurality of bits to the second set of transmission symbols such that the at least the subset of multiple transmission symbols in the second set of transmission symbols corresponds to versions, that are phase shifted by 180°

, of transmission symbols in the corresponding at least the subset of multiple transmission symbols in the first set of transmission symbols.

6. The method of claim 5, wherein mapping the plurality of bits to the second set of transmission symbols comprises:

mapping the plurality of bits to the second set of transmission symbols such that;

a first subset of multiple transmission symbols in the second set of transmission symbols are the same as a first subset of multiple transmission symbols in the first set of transmission symbols, and

a second subset of multiple transmission symbols in the second set of transmission symbols corresponds to versions of transmission symbols in a second subset of multiple transmission symbols in the first set of transmission symbols that are phase shifted by 180°

.

7. The method of claim 6, wherein:

the first subset of multiple transmission symbols in the second set of transmission symbols are contiguous with respect to a subcarrier index; and

the second subset of multiple transmission symbols in the second set of transmission symbols are contiguous with respect to the subcarrier index.

8. The method of claim 6, wherein:

transmission symbols in the first subset of multiple transmission symbols in the second set of transmission symbols alternate, with respect to a subcarrier index, with symbols in the second subset of multiple transmission symbols in the second set of transmission symbols.

9. The method of claim 1, wherein:

mapping the plurality of bits to the first set of transmission symbols comprises mapping the plurality of bits to a first set of binary phase shift keying (BPSK) transmission symbols; and

mapping the plurality of bits to the second set of transmission symbols comprises mapping the plurality of bits to a second set of BPSK transmission symbols.

10. The method of claim 1, further comprising at least one of:

i) encoding, at the communication device, the plurality of bits using a forward error correction encoder prior to a) mapping the plurality of bits to the first set of transmission symbols and b) mapping the plurality of bits to the second set of transmission symbols; and

ii) reordering, at the communication device, the first set of transmission symbols and the second set of transmission symbols with respect to a subcarrier index.

11. The method of claim 1, wherein:

the component communication channel has a bandwidth equal to 20 MHz.

12. The method of claim 1, wherein:

the transmission signal corresponds to a physical layer (PHY) data unit;

the first set of transmission symbols and the second set of transmission symbols correspond to a PHY payload of the PHY data unit; and

dual carrier modulation (DCM) is not utilized for any transmission symbols, on subcarriers within the component channel, corresponding to a PHY preamble of the PHY data unit.

13. An apparatus, comprising:

a network interface device associated with a communication device, wherein the network interface device is implemented using one or more integrated circuits (ICs), wherein the network interface device includes;

a physical layer (PHY) processor implemented using the one or more ICs, the PHY processor including a dual carrier modulator (DCM) configured to;

map a plurality of bits to a first set of transmission symbols corresponding to a first set of subcarriers within a component communication channel, wherein transmission symbols among the first set of transmission symbols corresponds to respective subsets of one or more bits, and transmission symbols among the first set of transmission symbols are single carrier transmission symbols, and

map the plurality of bits to a second set of transmission symbols corresponding to a second set of subcarriers within the component communication channel, wherein at least a subset of multiple transmission symbols in the second set of transmission symbols corresponds to phase adjusted versions of transmission symbols in a corresponding at least a subset of multiple transmission symbols in the first set of transmission symbols;

wherein the PHY processor is configured to generate a transmission signal for transmission in a communication network using the first set of transmission symbols and the second set of transmission symbols.

14. The apparatus of claim 13, wherein the DCM is configured to:

map the plurality of bits to the second set of transmission symbols such that all transmission symbols in the second set of transmission symbols correspond to phase adjusted versions of transmission symbols in the first set of transmission symbols.

15. The apparatus of claim 14, wherein the DCM is configured to:

adjust all transmission symbols in the second set of transmission symbols by a same phase as compared to transmission symbols in the first set of transmission symbols.

16. The apparatus of claim 15, wherein the same phase is π

/2 radians.

17. The apparatus of claim 13, wherein the DCM is configured to:

map the plurality of bits to the second set of transmission symbols such that the at least the subset of multiple transmission symbols in the second set of transmission symbols corresponds to versions, that are phase shifted by 180°

, of transmission symbols in the corresponding at least the subset of multiple transmission symbols in the first set of transmission symbols.

18. The apparatus of claim 17, wherein the DCM is configured to:

map the plurality of bits to the second set of transmission symbols such that;

a first subset of multiple transmission symbols in the second set of transmission symbols are the same as a first subset of multiple transmission symbols in the first set of transmission symbols, and

a second subset of multiple transmission symbols in the second set of transmission symbols corresponds to versions of transmission symbols in a second subset of multiple transmission symbols in the first set of transmission symbols that are phase shifted by 180°

.

19. The apparatus of claim 18, wherein the DCM is configured to map the plurality of bits to the second set of transmission symbols such that:

the first subset of multiple transmission symbols in the second set of transmission symbols are contiguous with respect to a subcarrier index; and

the second subset of multiple transmission symbols in the second set of transmission symbols are contiguous with respect to the subcarrier index.

20. The apparatus of claim 18, wherein the DCM is configured to map the plurality of bits to the second set of transmission symbols such that:

transmission symbols in the first subset of multiple transmission symbols in the second set of transmission symbols alternate, with respect to a subcarrier index, with symbols in the second subset of multiple transmission symbols in the second set of transmission symbols.

21. The apparatus of claim 13, wherein:

the transmission signal corresponds to a PHY data unit;

the first set of transmission symbols and the second set of transmission symbols correspond to a PHY payload of the PHY data unit; and

the PHY processor does not utilize dual carrier modulation for any transmission symbols, on subcarriers within the component channel, corresponding to a PHY preamble of the PHY data unit.

22. The apparatus of claim 13, wherein the network interface device further comprises:

a media access control layer (MAC) processor implemented using the one or more ICs, the MAC processor coupled to the PHY processor.

23. The apparatus of claim 13, further comprising:

one or more antennas coupled to the network interface device.