Wireless interference mitigation

• US 9,680,669 B2
• Filed: 12/03/2013
• Issued: 06/13/2017
• Est. Priority Date: 12/03/2012
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Intel Corporation
• Inventors: Bolotin, Ilya, Davydov, Alexei, Maltsev, Alexander, Han, Seunghee, Morozov, Gregory
• Primary Examiner(s): NGUYEN, MINH TRANG T
• Application Number:
  US14/440,701
• Publication Number:
  US 20150256279A1
• Time in Patent Office: 1,288 Days
• Field of Search: None
• CPC Class Codes: H04B 1/12 Neutralising, balancing, or compensation arrangements
• CPC Class Codes: H04B 1/3827 Portable transceivers
• CPC Class Codes: H04B 17/24 with feedback of measurements to the transmitter
• CPC Class Codes: H04B 17/26 using historical data, averaging values or statistics
• CPC Class Codes: H04B 17/345 Interference values signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/15557 Selecting relay station operation mode, e.g. between amplify and forward mode, decode and forward mode or FDD - and TDD mode
• CPC Class Codes: H04J 11/005 of intercell interference
• CPC Class Codes: H04J 11/0053 using co-ordinated multipoint transmission/reception co-ordinated antenna or beam-forming aspects H04B7/022
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0054 Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1867 Arrangements specially adapted for the transmitter end
• CPC Class Codes: H04L 25/0202 Channel estimation
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/03305 Joint sequence estimation and interference removal joint detection of several desired signals H04L25/03331
• CPC Class Codes: H04L 27/0008 arrangements for allowing a transmitter or receiver to use more than one type of modulation negotiating modulation type for two-way transmission paths H04L5/1453
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 : Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0055 : Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0057 : Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0058 : Allocation criteria
• CPC Class Codes: H04L 5/0092 : Indication of how the channel is divided
• CPC Class Codes: H04W 24/02 : Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/10 : Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 36/10 : Reselecting an access point controller
• CPC Class Codes: H04W 40/16 : based on interference
• CPC Class Codes: H04W 52/0261 : managing power supply demand, e.g. depending on battery level
• CPC Class Codes: H04W 52/40 : during macro-diversity or soft handoff
• CPC Class Codes: H04W 72/12 : Wireless traffic scheduling
• CPC Class Codes: H04W 72/121 : for groups of terminals or users
• CPC Class Codes: H04W 72/20 : Control channels or signalling for resource management
• CPC Class Codes: H04W 72/23 : in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/51 : based on terminal or device properties
• CPC Class Codes: H04W 72/52 : based on load
• CPC Class Codes: H04W 72/54 : based on quality criteria
• CPC Class Codes: H04W 72/541 : using the level of interference
• CPC Class Codes: H04W 72/566 : of the information or information source or recipient
• CPC Class Codes: H04W 72/569 : of the traffic information
• CPC Class Codes: H04W 76/14 : Direct-mode setup
• CPC Class Codes: H04W 76/27 : Transitions between radio resource control [RRC] states
• CPC Class Codes: H04W 76/28 : Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: H04W 84/042 : Public Land Mobile systems, e.g. cellular systems
• CPC Class Codes: H04W 84/18 : Self-organising networks, e.g. ad-hoc networks or sensor networks
• CPC Class Codes: H04W 92/18 : between terminal devices
• CPC Class Codes: Y02D 30/70 : in wireless communication networks

Abstract

Embodiments can relate to an apparatus for interference mitigation in a wireless communication. The apparatus can comprise at least one processing element arranged to extract, from a received PDCCH or EPDCCH signal, modulated symbols; the modulated symbols having been modulated using a linear m-ary modulation constellation. The apparatus also comprises a demodulator to demodulate the extracted PDCCH or EPDCCH modulated symbols; the demodulator being operable to demodulate the extracted symbols according to the linear m-ary modulation constellation.

Claims

1. An eNode B (“

eNB”

) for interference mitigation in a wireless communication, the eNB comprising;

a modulator to receive user equipment (“

UE”

) data to be transmitted to a UE, the UE data representing data of a physical downlink control channel (“

PDCCH”

) or an enhanced physical downlink control channel (“

EPDCCH”

);

the modulator being configurable to operate according to a linear m-ary modulation constellation to modulate the data of the PDCCH or EPDCCH according to the linear m-ary modulation constellation and to output modulated data;

a resource mapper arranged to map the modulated data onto allocated subcarriers;

a subcarrier modulator to receive the mapped modulated data and output respective subcarriers associated with the mapped modulated data,

wherein the linear m-ary modulation constellation comprises a set of constellation points that are all linearly disposed.

2. The eNB of claim 1, further comprising an inserter to adapt the respective subcarriers to mitigate inter-symbol interference.

3. The eNB of claim 2, further comprising at least one antenna and a radio-frequency (“

RF”

) transmitter to transmit the adapted subcarriers.

4. The eNB of claim 1, in which the linear m-ary modulation constellation is a Pulse Amplitude Modulation constellation.

5. The eNB of claim 1, wherein the PDCCH has associated data to indicate which subframe or subframes use the linear m-ary modulation constellation.

6. The eNB of claim 5, wherein the associated data comprises a bit pattern to identify which subframe or subframes use the linear m-ary modulation constellation.

7. The eNB of claim 1, wherein the EPDCCH has associated data to provide an indication of which EPDCCH resources use the linear m-ary modulation constellation.

8. The eNB of claim 7, wherein the associated data comprises a bit pattern to identify which EPDCCH resources use the linear m-ary modulation constellation.

9. A user equipment (UE) comprising:

a cyclic prefix remover to remove at least one cyclic prefix from a received signal;

the received signal being a downlink control signal comprising orthogonal frequency division multiplexing (“

OFDM”

) symbols modulated with a linear modulation constellation;

the cyclic prefix remover being arranged to output the OFDM symbols without the at least one cyclic prefix;

a serial to parallel converter to receive the OFDM symbols and output an associated plurality of subcarriers;

a transformer to Fourier transform the associated plurality of subcarriers to a further plurality of sub carriers;

a resource selector to select one or more than one of the further plurality of subcarriers for demodulation and output any selected further subcarriers for demodulation; and

a demodulator to demodulate any output selected further subcarriers according to the linear modulation constellation,

wherein the linear modulation constellation comprises a plurality of linearly disposed points.

10. The UE of claim 9, in which the linear modulation constellation is a Pulse Amplitude Modulation constellation.

11. The UE of claim 9, in which the received signal comprises at least a physical downlink control channel (“

PDCCH”

) having associated data for indicating which subframe or subframes thereof use the linear modulation constellation.

12. The UE of claim 11, wherein the associated data is a bit pattern identifying which subframe or subframes use the linear modulation constellation.

13. The UE of claim 9, in which the received signal comprises at least an enhanced physical downlink control channel (“

EPDCCH”

) having associated data to provide an indication of which EPDCCH resources thereof use the linear modulation constellation.

14. The UE of claim 13, wherein the associated data is a bit pattern identifying which EPDCCH resources use the linear modulation constellation.

15. The UE of claim 9, further comprising (a) at least one antenna for receiving a physical downlink control channel (“

PDCCH”

) or an enhanced physical downlink control channel (“

EPDCCH”

), (b) a screen to output data, (c) a keyboard to input data or operate an apparatus, or (d) an audio output device.

16. A method of demodulating a received physical downlink control channel (“

PDCCH”

) or an enhanced physical downlink control channel (“

EPDCCH”

) signal comprising orthogonal frequency division multiplexing (“

OFDM”

) data modulated using a linear modulation constellation for interference mitigation;

the method comprising;

receiving a PDCCH or EPDCCH signal comprising OFDM control data modulated using a linear modulation constellation;

removing any cyclic prefixes associated with the OFDM control data;

Fourier transforming the OFDM control data; and

demodulating the Fourier transformed OFDM control data according to the linear modulation constellation and outputting corresponding data,

the linear modulation constellation comprises I and Q components representing constellation points that are all linearly disposed.

17. A non-transitory computer program product comprising machine-readable storage storing a computer program having instructions arranged, when executed, to implement the method of claim 16.

18. A non-transitory computer program product comprising machine-readable storage storing a computer program having instructions arranged, when executed, to cause an eNode B (“

eNB”

) to;

receive user equipment (“

UE”

) data to be transmitted to a UE, the UE data representing data of a physical downlink control channel (“

PDCCH”

) or an enhanced physical downlink control channel (“

EPDCCH”

);

modulate the data of the PDCCH or EPDCCH according to a linear m-ary modulation constellation and to output modulated data;

map the modulated data onto allocated subcarriers; and

receive the mapped modulated data and output respective subcarriers associated with the mapped modulated data,

wherein the linear m-ary modulation constellation comprises a set of constellation points that are all linearly disposed.

19. The non-transitory computer program product of claim 18, wherein the instructions, when executed, further cause the eNB to adapt the respective subcarriers to mitigate inter-symbol interference.

20. The non-transitory computer program product of claim 18, wherein the linear m-ary modulation constellation is a Pulse Amplitude Modulation constellation.

21. The non-transitory computer program product of claim 18, wherein a PDCCH has associated data to indicate which subframe or subframes use the linear m-ary modulation constellation.

22. The non-transitory computer program product of claim 21, wherein the associated data comprises a bit pattern to identify which subframe or subframes use the linear m-ary modulation constellation.

23. The non-transitory computer program product of claim 18, wherein the EPDCCH has associated data to provide an indication of which EPDCCH resources use the linear m-ary modulation constellation.

24. The non-transitory computer program product of claim 23, wherein the associated data comprises a bit pattern to identify which EPDCCH resources use the linear m-ary modulation constellation.

25. A non-transitory computer program product comprising machine-readable storage storing a computer program having instructions arranged, when executed, to cause a user equipment to:

remove at least one cyclic prefix from a received signal;

the received signal being a downlink control signal comprising orthogonal frequency division multiplexing (“

OFDM”

) symbols modulated with a linear modulation constellation;

output the OFDM symbols without the at least one cyclic prefix;

receive the OFDM symbols and output an associated plurality of subcarriers;

Fourier transform the associated plurality of subcarriers to a further plurality of subcarriers;

select one or more than one of the further plurality of subcarriers for demodulation and output any selected further subcarriers for demodulation; and

demodulate any output selected further subcarriers according to the linear modulation constellation,

wherein the linear modulation constellation comprises a plurality of linearly disposed points.

26. The non-transitory computer program product of claim 25, wherein the linear modulation constellation is a Pulse Amplitude Modulation constellation.

27. The non-transitory computer program product of claim 25, wherein the received signal comprises at least a physical downlink control channel (“

PDCCH”

) having associated data for indicating which subframe or subframes thereof use the linear m-ary modulation constellation.

28. The non-transitory computer program product of claim 27, wherein the associated data is a bit pattern identifying which subframe or subframes use the linear m-ary modulation constellation.

29. The non-transitory computer program product of claim 25, wherein the received signal comprises at least an enhanced physical downlink control channel (“

EPDCCH”

) having associated data to provide an indication of which EPDCCH resources thereof use the linear m-ary modulation constellation.

30. The non-transitory computer program product of claim 29, wherein the associated data is a bit pattern identifying which EPDCCH resources use the linear m-ary modulation constellation.