MC-CDMA multiplexing in an orthogonal uplink

• US 8,649,451 B2
• Filed: 04/19/2011
• Issued: 02/11/2014
• Est. Priority Date: 12/22/2004
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Sutivong, Arak, Agrawal, Avneesh
• Primary Examiner(s): TSE, YOUNG TOI
• Application Number:
  US13/090,220
• Publication Number:
  US 20110235685A1
• Time in Patent Office: 1,029 Days
• Field of Search: 375/132, 375/133, 375/135, 375/136, 375/138, 375/142, 375/146, 375/147, 375/150, 375/260, 375/262, 375/265, 375/343, 370208-210
• US Class Current: 375/260
• CPC Class Codes: H04B 1/692 Hybrid techniques using combinations of two or more spread spectrum techniques
• CPC Class Codes: H04B 1/713 using frequency hopping
• CPC Class Codes: H04J 13/18 Allocation of orthogonal codes
• CPC Class Codes: H04L 5/0021 in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA

Abstract

Techniques are provided to support multi-carrier code division multiple access (MC-CDMA) in an orthogonal uplink of a wireless communication system. A method of wireless multi-carrier communications comprises dividing sub-carriers on an uplink into non-overlapping groups, allocating a time-frequency block including a hopping duration and a non-overlapped group, respectively, assigning a different set of orthogonal codes to each user, spreading data (or pilot) symbols of each user over the allocated time-frequency block, wherein the data (or pilot) symbols of each user are spread using the different set of orthogonal codes assigned to each user, mapping each data (or pilot) symbol to a modulation symbol in the time-frequency block, generating an orthogonal waveform based on the mapped symbols, and transmitting the orthogonal waveform.

Claims

1. A method for providing wireless transmissions from a user device over a plurality of sub-carriers, comprising:

utilizing, at the user device, one non-overlapping group of the sub-carriers over which the user device is to transmit;

utilizing, at the user device, a user device specific set of orthogonal codes;

spreading symbols using the user device specific set of orthogonal codes to form user device orthogonally spread symbols; and

providing the user device orthogonally spread symbols from the user device by frequency hopping over time within the one non-overlapping group of the sub-carriers over which the user device transmits,

wherein the user device is one of multiple user devices sharing a single time-frequency allocation of the one non-overlapping group of the sub-carriers, and wherein the multiple user devices are each configured to transmit respective user device orthogonally spread symbols within the single time-frequency allocation of the one non-overlapping group of the sub-carriers.

2. The method of claim 1, wherein the providing the user device orthogonally spread symbols comprises providing common pilot symbols from the user device over time within the one non-overlapping group of the sub-carriers over which the user device transmits for use in channel estimation.

3. The method of claim 1, wherein the providing the user device orthogonally spread symbols comprises spreading the symbols between frequencies over time using the user device specific set of orthogonal codes.

4. A user device configured to provide wireless transmissions over a plurality of sub-carriers, comprising:

a controller configured to utilize one non-overlapping group of the sub-carriers over which the user device is to transmit, to utilize a user device specific set of orthogonal codes, and to spread symbols using the user device specific set of orthogonal codes to form user device orthogonally spread symbols; and

a transmitter connected to the controller and configured to provide the user device orthogonally spread symbols by frequency hopping over time within the one non-overlapping group of the sub-carriers over which the user device transmits,

wherein the user device is one of multiple user devices sharing a single time-frequency allocation of the one non-overlapping group of the sub-carriers, and wherein the multiple user devices are each configured to transmit respective user device orthogonally spread symbols within the single time-frequency allocation of the one non-overlapping group of the sub-carriers.

5. The user device of claim 4, wherein the transmitter is further configured to provide common pilot symbols from the user device over time within the one non-overlapping group of the sub-carriers over which the user device transmits for use in channel estimation.

6. The user device of claim 4, wherein the transmitter is further configured to spread the symbols between frequencies over time using the user device specific set of orthogonal codes.

7. A user device configured to provide wireless transmissions over a plurality of sub-carriers, comprising:

means for utilizing, at the user device, one non-overlapping group of the sub-carriers over which the user device is to transmit, utilizing, at the user device, a user device specific set of orthogonal codes, and spreading symbols using the user device specific set of orthogonal codes to form user device orthogonally spread symbols; and

means for providing the user device orthogonally spread symbols from the user device by frequency hopping over time within the one non-overlapping group of the sub-carriers over which the user device transmits,

wherein the user device is one of multiple user devices sharing a single time-frequency allocation of the one non-overlapping group of the sub-carriers, and wherein the multiple user devices are each configured to transmit respective user device orthogonally spread symbols within the single time-frequency allocation of the one non-overlapping group of the sub-carriers.

8. The user device of claim 7, wherein the means for providing the user device orthogonally spread symbols comprise means for providing common pilot symbols from the user device over time within the one non-overlapping group of the sub-carriers over which the user device transmits for use in channel estimation.

9. The user device of claim 7,

wherein the means for providing the user device orthogonally spread symbols comprise means for spreading the symbols between frequencies over time using the user device specific set of orthogonal codes.

10. A non-transitory computer readable medium embodying code executable by a processor for implementing a method for providing wireless transmissions from a user device over a plurality of sub-carriers, the method comprising:

utilizing, at the user device, one non-overlapping group of the sub-carriers over which the user device is to transmit;

utilizing, at the user device, a user device specific set of orthogonal codes;

spreading symbols using the user device specific set of orthogonal codes to form user device orthogonally spread symbols; and

providing the user device orthogonally spread symbols from the user device by frequency hopping over time within the one non-overlapping group of the sub-carriers over which the user device transmits,

wherein the user device is one of multiple user devices sharing a single time-frequency allocation of the one non-overlapping group of the sub-carriers, and wherein the multiple user devices are each configured to transmit respective user device orthogonally spread symbols within the single time-frequency allocation of the one non-overlapping group of the sub-carriers.

11. The non-transitory computer readable medium of claim 10, wherein providing the user device orthogonally spread symbols comprises providing common pilot symbols from the user device over time within the one non-overlapping group of the sub-carriers over which the user device transmits for use in channel estimation.

12. The non-transitory computer readable medium of claim 10, wherein the providing the user device orthogonally spread symbols further comprises spreading the symbols between frequencies over time using the user device specific set of orthogonal codes.

13. A user device configured to provide wireless transmissions over a plurality of sub-carriers, comprising:

a controller configured to utilize one non-overlapping group of the sub-carriers over which the user device is to transmit, said one non-overlapping group of the sub-carriers not overlapping with groups utilized by other user devices in a region wherein the user device transmits, wherein multiple user devices are sharing one time-frequency allocation of the one non-overlapping group of the sub-carriers;

a modulator coupled to the controller and configured to process symbols utilizing a user device specific set of orthogonal codes by spreading the symbols using the user device specific set of orthogonal codes to form user device orthogonally spread symbols for transmission over the one non-overlapping group of the sub-carriers;

a transmit processor configured to receive the user device orthogonally spread symbols from the modulator and provide N transmit symbols for N sub-carriers, where N is an integer greater than one; and

a transmitter configured to transmit the N transmit symbols over the N sub-carriers,

wherein the user device is one of the multiple user devices each configured to transmit respective user device orthogonally spread symbols within a single time-frequency allocation of the N sub-carriers.

14. The user device of claim 13, wherein the modulator comprises a transform unit configured to transform the N transmit symbols into time domain.

15. The user device of claim 14, wherein the transform unit provides a number of transformed symbols, and the modulator further comprises a cyclic prefix generator configured to repeat a portion of each transform symbol to form a symbol comprising N plus a number of data chips being repeated.

16. The user device of claim 15, wherein the transmit processor comprises a transmit pilot processor configured to receive a stream of data chips produced using the cyclic prefix generator and at least one pilot symbol and generate a narrowband pilot signal.

17. The user device of claim 13, wherein the modulator is further configured to spread the symbols between frequencies over time using the user device set of orthogonal codes.

18. A method for providing, from a user device, wireless transmissions over a plurality of sub-carriers, comprising:

utilizing one non-overlapping group of the sub-carriers over which the user device is to transmit, said one non-overlapping group of the sub-carriers not overlapping with groups utilized by other user devices in a region wherein the user device transmits, wherein multiple user devices are sharing one time-frequency allocation of the one non-overlapping group of the sub-carriers;

processing symbols utilizing a user device specific set of orthogonal codes by spreading the symbols using the user device specific set of orthogonal codes to form user device orthogonally spread symbols for transmission over the one non-overlapping group of the sub-carriers;

providing N transmit symbols for N sub-carriers, where N is an integer greater than one; and

transmitting the N transmit symbols over the N sub-carriers,

wherein the user device is one of the multiple user devices each configured to transmit respective user device orthogonally spread symbols within a single time-frequency allocation of the N sub-carriers.

19. The method of claim 18, further comprising transforming the N transmit symbols into time domain.

20. The method of claim 19, wherein the transforming the N transmit symbols provides a number of transformed symbols, the method further comprising repeating a portion of each transform symbol to form a symbol comprising N plus a number of data chips being repeated.

21. The method of claim 20, further comprising receiving a stream of data chips produced by the repeating and at least one pilot symbol and generating a narrowband pilot signal.

22. The method of claim 18, further comprising spreading the symbols between frequencies over time using the user device set of orthogonal codes.

23. A user device configured to provide wireless transmissions over a plurality of sub-carriers, comprising:

means for utilizing one non-overlapping group of the sub-carriers over which the user device is to transmit, said one non-overlapping group of the sub-carriers not overlapping with groups utilized by other user devices in a region wherein the user device transmits, wherein multiple user devices are sharing one time-frequency allocation of the one non-overlapping group of the sub-carriers;

means for processing symbols utilizing a user device specific set of orthogonal codes by spreading the symbols using the user device specific set of orthogonal codes to form user device orthogonally spread symbols for transmission over the one non-overlapping group of the sub-carriers;

means for providing N transmit symbols for N sub-carriers, where N is an integer greater than one; and

means for transmitting the N transmit symbols over the N sub-carriers,

wherein the user device is one of the multiple user devices each configured to transmit respective user device orthogonally spread symbols within a single time-frequency allocation of the N sub-carriers.

24. The user device of claim 23, further comprising means for transforming the N transmit symbols into time domain.

25. The user device of claim 24, wherein the means for transforming the N transmit symbols provides a number of transformed symbols, the user device further comprising means for repeating a portion of each transform symbol to form a symbol comprising N plus a number of data chips being repeated.

26. The user device of claim 25, further comprising means for receiving a stream of data chips from the means for repeating and at least one pilot symbol and generating a narrowband pilot signal.

27. The user device of claim 23, wherein the means for processing comprises means for spreading the symbols between frequencies over time using the user device set of orthogonal codes.

28. A non-transitory computer readable medium embodying code executable by a processor for implementing a method for providing, from a user device, wireless transmissions over a plurality of sub-carriers, the method comprising:

utilizing one non-overlapping group of the sub-carriers over which the user device is to transmit, said one non-overlapping group of the sub-carriers not overlapping with groups utilized by other user devices in a region wherein the user device transmits, wherein multiple user devices are sharing one time-frequency allocation of the one non-overlapping group of the sub-carriers;

processing symbols utilizing a user device specific set of orthogonal codes by spreading the symbols using the user device specific set of orthogonal codes to form user device orthogonally spread symbols for transmission over the one non-overlapping group of the sub-carriers;

providing N transmit symbols for N sub-carriers, where N is an integer greater than one; and

transmitting the N transmit symbols over the N sub-carriers,

wherein the user device is one of the multiple user devices each configured to transmit respective user device orthogonally spread symbols within a single time-frequency allocation of the N sub-carriers.

29. The non-transitory computer readable medium of claim 28, the method further comprising transforming the N transmit symbols into time domain.

30. The non-transitory computer readable medium of claim 29, wherein the transforming the N transmit symbols provides a number of transformed symbols, the method further comprising repeating a portion of each transform symbol to form a symbol comprising N plus a number of data chips being repeated.

31. The non-transitory computer readable medium of claim 30, the method further comprising receiving a stream of data chips produced by the repeating and at least one pilot symbol and generating a narrowband pilot signal.

32. The non-transitory computer readable medium of claim 28, the method further comprising spreading the symbols between frequencies over time using the user device set of orthogonal codes.