UPLINK PILOT MULTIPLEXING IN SINGLE USER MIMO AND SDMA FOR SINGLE CARRIER FREQUENCY DIVISION MULTIPLE ACCESS SYSTEMS

• US 20090316675A1
• Filed: 10/05/2007
• Published: 12/24/2009
• Est. Priority Date: 10/10/2006
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Malladi, Durga Prasad, Montojo, Juan, Zhang, Xiaoxia
• Granted Patent: US 8,300,533 B2
• Time in Patent Office: Days
• US Class Current: 370/343
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver

Abstract

Systems and methodologies are described that facilitate adaptive uplink pilot multiplexing schemes. In various embodiments, frequency position and pilot channel bandwidth can be adaptively varied in a block over time based on the uplink channel data, such as the number of streams to be multiplexed. Thus, the provided adaptive uplink pilot multiplexing schemes provide flexible uplink pilot allocation schemes while maintaining single carrier waveform for improved transmit power efficiency and orthogonality of pilots within blocks for improve channel estimation and suppression of interference.

Claims

1. A method for pilot multiplexing in a wireless communication system, the method comprising:

determining uplink pilot channel information in a base station;

transmitting the uplink pilot channel information to one or more wireless terminals to facilitate multiplexing uplink pilots by varying pilot channel bandwidth and frequency location per block over time according to a predetermined function of the uplink pilot channel information; and

receiving and demultiplexing the multiplexed uplink pilots according to the predetermined function.

2. The method of claim 1, the determining uplink pilot channel information includes determining a number of one or more active streams to be multiplexed.

3. The method of claim 1, the determining uplink pilot channel information includes determining a number of available resource blocks.

4. The method of claim 1, the determining uplink pilot channel information includes determining a starting frequency position.

5. The method of claim 2, wherein the frequency location of the multiplexed uplink pilots for each active stream is cyclically shifted across the block over time to form a contiguous frequency block in each block.

6. A method for pilot multiplexing in a wireless communication system, the method comprising:

receiving uplink pilot channel information from a base station;

multiplexing uplink pilots by varying pilot channel bandwidth and frequency location per block over time in a wireless terminal according to a predetermined function of the uplink pilot channel information; and

transmitting the uplink pilots.

7. The method of claim 6, the receiving uplink pilot channel information includes receiving a number of one or more active streams to be multiplexed.

8. The method of claim 6, the receiving uplink pilot channel information includes receiving a number of available resource blocks.

9. The method of claim 6, the receiving uplink pilot channel information includes receiving a starting frequency position.

10. The method of claim 6, the transmitting the uplink pilots includes transmitting the uplink pilots having varying pilot channel bandwidth and frequency location per block.

11. The method of claim 7, wherein the frequency location of the multiplexed uplink pilots for each active stream is cyclically shifted across the block over time to form a contiguous frequency block in each block.

12. The method of claim 7, the uplink pilot per active stream is frequency division multiplexed in an orthogonal manner per block.

13. A communications apparatus, comprising:

a memory that retains instructions for determining and transmitting uplink pilot channel information, receiving adaptively multiplexed pilots, and demultiplexing the received pilots according to a predetermined function of the uplink pilot channel information; and

a processor that is configured to execute the instructions within the memory.

14. The communications apparatus of claim 13, wherein the multiplexed pilots comprise pilots having varying pilot channel bandwidth and frequency location per block over time.

15. The communications apparatus of claim 13, wherein the instructions for determining uplink pilot channel information further comprise instructions for determining one of a number of one or more active streams to be multiplexed, a number of available resource blocks, and a starting frequency position.

16. The communications apparatus of claim 14, wherein the frequency location of the multiplexed pilots for each active stream is cyclically shifted across the block over time to form a contiguous frequency block.

17. A communications apparatus, comprising:

a memory that retains instructions for receiving and processing uplink pilot channel information, adaptively multiplexing pilots by cyclically varying the pilot bandwidth and frequency location per block based on the uplink pilot channel information, and transmitting the adaptively multiplexed pilots; and

a processor that is configured to execute the instructions within the memory.

18. The communications apparatus of claim 17, wherein the instructions for receiving and processing uplink pilot channel information further comprise instructions for receiving and processing at least one of a number of one or more active streams to be multiplexed, a number of available resource blocks, and a pilot channel starting frequency position.

19. The communications apparatus of claim 17, wherein the instructions for transmitting further comprise instructions for transmitting adaptively multiplexed pilots having varying pilot channel bandwidth and frequency location per block.

20. The communications apparatus of claim 17, wherein the instructions for adaptively multiplexing pilots includes instructions for frequency division multiplexing uplink pilot per active stream in an orthogonal manner per block.

21. A communications apparatus, comprising:

means for determining uplink pilot channel information in a base station;

means for transmitting the uplink pilot channel information;

means for receiving adaptively multiplexed pilots; and

means for demultiplexing the received pilots according to a predetermined function of the uplink pilot channel information.

22. The communications apparatus of claim 21, wherein the multiplexed pilots comprise pilots having varying pilot channel bandwidth and frequency location per block over time.

23. The communications apparatus of claim 21, wherein the uplink pilot channel information includes at least one of a number of one or more active streams to be multiplexed, a number of available resource blocks, and a pilot starting frequency position.

24. The communications apparatus of claim 21, further comprising means for frequency division multiplexing respective pilots per active stream in an orthogonal manner per block.

25. The communications apparatus of claim 22, wherein the frequency location of the multiplexed pilots for each active stream is cyclically shifted across the block to form a contiguous frequency block over time.

26. A communications apparatus, comprising:

means for receiving and processing uplink pilot channel information;

means for adaptively multiplexing uplink pilots by cyclically varying the pilot bandwidth and frequency location per block depending on the uplink pilot channel information; and

means for transmitting the adaptively multiplexed uplink pilots.

27. The communications apparatus of claim 26, wherein the means for receiving and processing uplink pilot channel information further includes means for receiving and processing at least one of a number of one or more active streams to be multiplexed, a number of available resource blocks, and a pilot channel starting frequency position.

28. The communications apparatus of claim 26, wherein the mean for transmitting include means for transmitting adaptively multiplexed pilots having varying pilot channel bandwidth and frequency location per short block.

29. The communications apparatus of claim 26, wherein the means for adaptively multiplexing pilots includes means for frequency division multiplexing uplink pilots per active stream in an orthogonal manner per block.

30. A machine-readable medium having computer-executable instructions stored thereon for:

determining and transmitting uplink pilot channel information, receiving adaptively multiplexed pilots, and demultiplexing the received pilots according to a predetermined function of the uplink pilot channel information.

31. The machine-readable medium of claim 30 further comprising computer-executable instructions stored thereon for demultiplexing the received pilots having varying pilot channel bandwidth and frequency location per block over time.

32. The machine-readable medium of claim 30 further comprising computer-executable instructions stored thereon for determining one of a number of one or more active streams to be multiplexed, a number of available resource blocks, and a starting frequency position.

33. The machine-readable medium of claim 31 further comprising computer-executable instructions stored thereon for demultiplexing the received pilots having regularly shifted frequency location across the block over time for each active stream.

34. A machine-readable medium having computer-executable instructions stored thereon for:

receiving and processing uplink pilot channel information, adaptively multiplexing pilots by regularly varying the pilot bandwidth and frequency location per block based on the uplink pilot channel information, and transmitting the adaptively multiplexed pilots.

35. The machine-readable medium of claim 34 further comprising computer-executable instructions stored thereon for receiving and processing at least one of a number of one or more active streams to be multiplexed, a number of available resource blocks, and a pilot channel starting frequency position.

36. The machine-readable medium of claim 34 further comprising computer-executable instructions stored thereon for transmitting adaptively multiplexed pilots having varying pilot channel bandwidth and frequency location per block.

37. The machine-readable medium of claim 34 further comprising computer-executable instructions stored thereon for frequency division multiplexing uplink pilot per active stream orthogonally per block.

38. In a wireless communication system, an apparatus comprising:

a processor configured to;

determine uplink pilot channel information in a base station;

transmit the uplink pilot channel information to one or more wireless terminals to facilitate multiplexing uplink pilots by varying pilot channel bandwidth and frequency location per block over time according to a predetermined function of the uplink pilot channel information; and

receive and demultiplex the multiplexed uplink pilots according to the predetermined function.

39. The communications apparatus of claim 38, wherein the multiplexed pilots include pilots having varying pilot channel bandwidth and frequency location per block over time.

40. The communications apparatus of claim 38, wherein the uplink pilot channel information includes at least one of a number of one or more active streams to be multiplexed, a number of available resource blocks, and a starting frequency position.

41. The communications apparatus of claim 39, wherein the frequency location of the multiplexed pilots for each active stream is cyclically shifted across the block over time to form a contiguous frequency block.

42. In a wireless communication system, an apparatus comprising:

a processor configured to;

receive uplink pilot channel information from a base station;

multiplex uplink pilots by varying pilot channel bandwidth and frequency location per block over time in a wireless terminal according to a predetermined function of the uplink pilot channel information; and

transmit the uplink pilots.

43. The communications apparatus of claim 42, wherein the processor is further configured to receive and process at least one of a number of one or more active streams to be multiplexed, a number of available resource blocks, and a pilot channel starting frequency position.

44. The communications apparatus of claim 42, wherein the processor is further configured to transmit adaptively multiplexed pilots having varying pilot channel bandwidth and frequency location per block.

45. The communications apparatus of claim 42, wherein the processor is further configured to frequency division multiplex uplink pilots per active stream in an orthogonal manner per block.