Code division multiplexing in a single-carrier frequency division multiple access system

• US 9,693,339 B2
• Filed: 09/10/2014
• Issued: 06/27/2017
• Est. Priority Date: 08/08/2005
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Khandekar, Aamod Dinkar, Palanki, Ravi, Sutivong, Arak
• Primary Examiner(s): MILLS, DONALD L
• Application Number:
  US14/483,001
• Publication Number:
  US 20140376518A1
• Time in Patent Office: 1,021 Days
• Field of Search: None
• CPC Class Codes: H04B 1/692 Hybrid techniques using combinations of two or more spread spectrum techniques
• CPC Class Codes: H04J 1/00 Frequency-division multiplex systems H04J14/00 takes precedence
• CPC Class Codes: H04J 11/00 Orthogonal multiplex systems, e.g. using WALSH codesH04J13/00 takes precedence
• CPC Class Codes: H04J 13/10 Code generation
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/0226 sounding signals per se
• CPC Class Codes: H04L 25/0228 with direct estimation from sounding signals
• CPC Class Codes: H04L 25/0242 using matrix methods
• CPC Class Codes: H04L 25/03866 using scrambling
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/2615 Reduction thereof using coding
• CPC Class Codes: H04L 27/2636 with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
• CPC Class Codes: H04L 27/2643 using symbol repetition, e.g. time domain realization of distributed FDMA
• CPC Class Codes: H04L 5/0021 in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA
• CPC Class Codes: H04L 5/0026 Division using four or more dimensions
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management

Abstract

In a single-carrier frequency division multiple access (SC-FDMA) system that utilizes interleaved FDMA (IFDMA) or localized FDMA (LFDMA), a transmitter generates modulation symbols for different types of data (e.g., traffic data, signaling, and pilot) and performs code division multiplexing (CDM) on at least one data type. For example, the transmitter may apply CDM on signaling and/or pilot sent on frequency subbands and symbol periods that are also used by at least one other transmitter. To apply CDM to a given data type (e.g., signaling), the transmitter performs spreading on the modulation symbols for that data type with an assigned spreading code. CDM may be applied across symbols, samples, samples and symbols, frequency subbands, and so on. The transmitter may perform scrambling after the spreading. The transmitter generates SC-FDMA symbols of the same or different symbol durations for traffic data, signaling, and pilot and transmits the SC-FDMA symbols.

Claims

1. A method of wireless communication, comprising:

generating N modulation symbols for control information;

spreading the N modulation symbols for the control information with a length L spreading code to obtain L sequences of N spread modulation symbols;

generating L single-carrier frequency division multiple access (SC-FDMA) symbols based on the L sequences of N spread modulation symbols and a set of contiguous subcarriers used for transmission; and

transmitting the L SC-FDMA symbols on the set of contiguous subcarriers across L symbol periods in a time slot assigned for transmission of the control information.

2. The method of claim 1, further comprising:

scrambling the N modulation symbols with a scrambling code prior to the spreading.

3. The method of claim 1, further comprising:

determining different sets of subcarriers to use for transmission in different time slots based on a frequency hopping pattern.

4. A method of wireless communication, comprising:

generating a single modulation symbol for control information;

spreading the single modulation symbol for the control information with a length L spreading code to obtain L spread modulation symbols;

mapping the L spread modulation symbols to a set of L contiguous subcarriers;

generating a single single-carrier frequency division multiple access (SC-FDMA) symbol based on the L spread modulation symbols mapped to the set of L contiguous subcarriers; and

transmitting the single SC-FDMA symbol on the set of L contiguous subcarriers in a time slot assigned for transmission of the control information.

5. The method of claim 4, wherein the spreading comprises spreading the single modulation symbol across the set of L contiguous subcarriers and across multiple symbol periods.

6. The method of claim 4, further comprising:

determining different sets of subcarriers to use for transmission in different time slots based on a frequency hopping pattern.

7. An apparatus for wireless communication, comprising:

means for generating N modulation symbols for control information;

means for spreading the N modulation symbols for the control information with a length L spreading code to obtain L sequences of N spread modulation symbols;

means for generating L single-carrier frequency division multiple access (SC-FDMA) symbols based on the L sequences of N spread modulation symbols and a set of contiguous subcarriers; and

means for transmitting the L SC-FDMA symbols on the set of contiguous subcarriers across L symbol periods in a time slot assigned for transmission of the control information.

8. The apparatus of claim 7, further comprising:

means for scrambling the N modulation symbols with a scrambling code prior to the spreading.

9. The apparatus of claim 7, further comprising:

means for determining different sets of subcarriers to use for transmission in different time slots based on a frequency hopping pattern.

10. An apparatus for wireless communication, comprising:

means for generating a single modulation symbol for control information;

means for spreading the single modulation symbol for the control information with a length L spreading code to obtain L spread modulation symbols;

means for mapping the L spread modulation symbols to a set of L contiguous subcarriers;

means for generating a single single-carrier frequency division multiple access (SC-FDMA) symbol based on the L spread modulation symbols mapped to the set of L contiguous subcarriers; and

means for transmitting the single SC-FDMA symbol on the set of L contiguous subcarriers in a time slot assigned for transmission of the control information.

11. The apparatus of claim 10, wherein the means for spreading spreads the single modulation symbol across the set of L contiguous subcarriers and across multiple symbol periods.

12. The apparatus of claim 10, further comprising:

means for determining different sets of subcarriers to use for transmission in different time slots based on a frequency hopping pattern.

13. A device for wireless communication, comprising:

a processor; and

a memory in electronic communication with the processor, the memory comprising instructions executable by the processor to;

generate N modulation symbols for control information;

spread the N modulation symbols for the control information with a length L spreading code to obtain L sequences of N spread modulation symbols;

generate L single-carrier frequency division multiple access (SC-FDMA) symbols based on the L sequences of N spread modulation symbols and a set of contiguous subcarriers; and

transmit the L SC-FDMA symbols on the set of contiguous subcarriers across L symbol periods in a time slot assigned for transmission of the control information.

14. The device of claim 13, wherein the memory further comprises instructions executable by the processor to:

scramble the N modulation symbols with a scrambling code prior to the spreading.

15. The device of claim 13, wherein the memory further comprises instructions executable by the processor to:

determine different sets of subcarriers to use for transmission in different time slots based on a frequency hopping pattern.

16. A device for wireless communication, comprising:

a processor; and

a memory in electronic communication with the processor, the memory comprising instructions executable by the processor to;

generate a single modulation symbol for control information;

spread the single modulation symbol for the control information with a length L spreading code to obtain L spread modulation symbols;

map the L spread modulation symbols to a set of L contiguous subcarriers;

generate a single single-carrier frequency division multiple access (SC-FDMA) symbol based on the L spread modulation symbols mapped to the set of L contiguous subcarriers; and

transmit the single SC-FDMA symbol on the set of L contiguous subcarriers in a time slot assigned for transmission of the control information.

17. The device of claim 16, wherein the memory further comprises instructions executable by the processor to spread the single modulation symbol across the set of L contiguous subcarriers and across multiple symbol periods.

18. The apparatus of claim 16, wherein the memory further comprises instructions executable by the processor to:

determine different sets of subcarriers to use for transmission in different time slots based on a frequency hopping pattern.

19. A non-transitory computer-readable medium storing computer executable code, the computer executable code comprising instructions for:

generating N modulation symbols for control information;

spreading the N modulation symbols for the control information with a length L spreading code to obtain L sequences of N spread modulation symbols;

generating L single-carrier frequency division multiple access (SC-FDMA) symbols for transmission based on the L sequences of N spread modulation symbols and a set of contiguous subcarriers used for transmission; and

transmitting the L SC-FDMA symbols on the set of contiguous subcarriers across L symbol periods in a time slot assigned for transmission of the control information.

20. A non-transitory computer-readable medium storing computer executable code, the computer executable code comprising instructions for:

generating a single modulation symbol for control information;

spreading the single modulation symbol for the control information with a length L spreading code to obtain L spread modulation symbols;

mapping the L spread modulation symbols to a set of L contiguous subcarriers;

generating a single single-carrier frequency division multiple access (SC-FDMA) symbol based on the L spread modulation symbols mapped to the set of L contiguous subcarriers; and

transmitting the single SC-FDMA symbol on the set of L contiguous subcarriers in a time slot assigned for transmission of the control information.