Efficient signal transmission methods and apparatus using a shared transmission resource

• US 8,593,932 B2
• Filed: 03/07/2006
• Issued: 11/26/2013
• Est. Priority Date: 05/16/2003
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Jin, Hui, Richardson, Tom, Li, Junyi, Laroia, Rajiv
• Primary Examiner(s): Pham, Chi
• Assistant Examiner(s): MENSAH, PRINCE AKWASI
• Application Number:
  US11/370,204
• Publication Number:
  US 20060203713A1
• Time in Patent Office: 2,821 Days
• Field of Search: 370203-215, 370/310, 370/312, 370/316, 370/318, 370/328, 370/329, 370342-345, 370477-480, 375/130, 375/141, 375/219, 375/224, 375/242, 375/244, 375259-274, 375/295, 375/300, 375/308, 375/316, 375/340, 375/341, 375346-348, 455/23, 455/42, 455/44, 455 59- 62, 455/67.16, 455/73, 455102-110, 455/450
• US Class Current: 370/203
• CPC Class Codes: H04L 25/49 using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems spectral shaping H04L25/03828
• CPC Class Codes: H04L 25/4902 Pulse width modulation; Pulse position modulation
• 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 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 5/023 Multiplexing of multicarrier modulation signals multicarrier modulation H04L27/2601

Abstract

A device includes a zero symbol rate (ZSR) coding/modulation module and a second type coding/modulation module. Both modules generate modulation symbols to be conveyed using the same air link resources but with the non-zero ZSR symbols having a higher power level. The ZSR module generates a mixture of zero and non-zero modulation symbols. A ZSR modulation scheme communicates information using both the position of the non-zero modulation symbols and the phase and/or amplitude of the non-zero modulation symbols. Different ZSR schemes, implementing different ratios relating the number of zero symbols to the total number of symbols, can be associated with different low data rates while second module modulation schemes can be associated with different high data rates. Modulation symbols from two modules are in some embodiments, superimposed. In some embodiments, non-zero ZSR modulation symbols punch out second module modulation symbols which occupy the same air link resource.

Claims

1. A method of transmitting sets of data, the method comprising operating a communications device to perform the steps of:

transmitting in a transmission segment including a plurality of minimum transmission units, a first set of data using at least some non-zero modulation symbols and some zero modulation symbols, the first set of data being communicated by a combination of position coding with the position of non-zero modulation symbols within the first segment communicating at least some information and at least one of phase and amplitude modulation of the transmitted non-zero modulation symbols communicating additional information; and

transmitting in said transmission segment a second set of data using modulation symbols transmitted on at least some of said minimum transmission units used to transmit said first set of data.

2. The method of claim 1, wherein said minimum transmission unit is an OFDM tone-symbol.

3. The method of claim 1, further comprising:

controlling the transmission power levels of non-zero modulation symbols used to communicate said first set of data and modulation symbols used to communicate said second set of data to maintain a minimum power difference.

4. The method of claim 3, wherein said minimum power difference is such that the non-zero modulation symbols used in communicating the first set of data are transmitted at a higher power level than non-zero modulation symbols used to communicate the second set of data.

5. The method of claim 1, wherein transmitting a first set of data includes transmitting information at a first information bit per minimum transmission unit data rate;

and

wherein transmitting a second set of data includes transmitting information at a second information bit per minimum transmission unit data rate, said second information bit per minimum transmission unit data rate being different from the first information bit per minimum transmission unit data rate.

6. The method of claim 5, wherein the second information bit per minimum transmission unit data rate is higher than said first information bit per minimum transmission unit data rate.

7. The method of claim 5, further comprising, prior to said step of transmitting a first set of data:

including in at least a portion of said segment non-zero modulation symbols and zero modulation symbols according to a predetermined zero symbol rate, said modulation symbols which are included according to said predetermined zero symbol rate corresponding to the first set of data.

8. The method of claim 5, further comprising, prior to said step of transmitting a first set of data:

including in at least a portion of said segment non-zero modulation symbols and zero modulation symbols according to one of a plurality of ratios, said ratios indicating predetermined zero symbol rates, said modulation symbols which are included according to one of the plurality of ratios corresponding to the first set of data.

9. The method of claim 8, wherein said one of a plurality of ratios indicates a predetermined zero symbol rate that is greater than or equal to 0.125 when the information bits per minimum transmission unit data rate used to transmit said first set of data is less than or equal to 1.5.

10. The method of claim 8, wherein if said one of a plurality of ratios is greater than or equal to 0.125, the information bits per minimum transmission unit data rate used to transmit said first set of data is less than or equal to 1.5;

and

wherein if said one of a plurality of ratios is greater than or equal to 0.25, the information bits per minimum transmission unit data rate used to transmit said first set of data is less than or equal to 1.

11. The method of claim 8, wherein said one of a plurality of ratios is greater than or equal to 0.5 when the information bits per minimum transmission unit data rate used to transmit said first set of data is less than or equal to 0.5.

12. The method of claim 8, wherein said one of a plurality of ratios is greater than or equal to 0.75 when the information bits per minimum transmission unit data rate used to transmit said first set of data is less than or equal to 1/3.

13. The method of claim 8, wherein said one of a plurality of ratios is greater than or equal to 0.875 when the information bits per minimum transmission unit data rate used to transmit said first set of data is less than or equal to 1/6.

14. The method of claim 8, wherein said transmitting a first set of data includes using QPSK modulation to transmit non-zero symbol values.

15. The method of claim 8, wherein said transmitting a first set of data includes using QPSK modulation to transmit non-zero modulation symbol values;

wherein if said one of a plurality of ratios is greater than or equal to 0.75, the information bits per minimum transmission unit data rate used to transmit said first set of data is less than or equal to 1/3; and

wherein if said one of a plurality of ratios is greater than or equal to 0.875, the information bits per minimum transmission unit data rate used to transmit said first set of data is less than or equal to 1/6.

16. The method of claim 8, further comprising:

partitioning, for use in transmitting said first set of data, said channel segment into a plurality of sub-segments, said portion being one of said sub-segments.

17. The method of claim 16, wherein said segment is not partitioned for use in transmitting said second set of data.

18. The method of claim 8, further comprising, prior to said transmitting the first set of data:

coding information bits included in said first set of data to generate coded information bits;

determining the position of at least one non-zero symbol value in said portion based on the value of at least one of the coded information bits; and

determining at least one of the phase and amplitude of said non-zero modulation symbol based on the value of at least another one of the coded information bits.

19. The method of claim 8, wherein said first set of data includes data having a first priority and data having a second priority, said second priority being lower than said first priority;

wherein said high priority data is communicated through position encoding which includes at least said step of determining the position of at least one non-zero modulation symbol value; and

wherein said low priority data is communicated through phase encoding.

20. The method of claim 1, further comprising, prior to said step of transmitting a first set of data:

including in at least a sub-segment of said segment zero modulation symbols and non-zero modulation symbols according to a ratio, said zero modulation symbols and non-zero modulation symbols which are included according to said ratio corresponding to the first set of data, said ratio being a ratio of positive integers, Nz/Nss, said ratio indicating a fractional proportion of the number of zero modulation symbols in the sub-segment corresponding to the first set of data to the total number of minimum transmission units in said sub-segment.

21. The method of claim 20, wherein said ratio Nz/Nss is one of 7/8, 3/4, 5/8, 1/2, 3/8, 1/4 and 1/8.

22. The method of claim 20, wherein the sub-segment size is one of 2, 3, 4, 5, 6, 7, and 8, said sub-segment size indicating the number of minimum transmission units in the sub-segment.

23. The method of claim 20, wherein the sub-segment size is an integer multiple of one of 2, 3, 4, 5, 6, 7, and 8.

24. The method of claim 20, wherein Nss is a multiple of two;

and wherein Nz is an odd number.

25. The method of claim 19, wherein the segment size is an integer multiple of a sub-segment size, said integer multiple being at least 2, said sub-segment size indicating the number of minimum transmission units in the sub-segment.

26. The method of claim 20, further comprising:

including in another sub-segment of said segment non-zero modulation symbols and zero modulation symbols according to a second ratio, said non-zero modulation symbols and non-zero modulation symbols which are included according to said second ratio corresponding to the first set of data, said second ratio being a second ratio of integers, N.sub.Z2/N.sub.SS2, said second ratio indicating a fractional proportion of the number of zero modulation symbols in the second sub-segment corresponding to the first set of data to the total number of minimum transmission units in said second sub-segment, the second ratio being different from the first ratio.

27. The method of claim 1, wherein said segment is a downlink traffic channel segment, the method further comprising, prior to said steps of transmitting in a transmission segment a first set of data and transmitting in a transmission segment a second set of data:

transmitting assignment information indicating a first wireless terminal to which said segment was assigned for use in receiving said first set of data and indicating a second wireless terminal to which said segment was assigned for use in receiving the second set of data.

28. The method of claim 27, wherein said first and second wireless terminals are different, and wherein said method further includes:

selecting said first and second wireless terminals from a plurality of wireless terminals based on information indicative of channel condition quality between a transmitter used to perform said transmitting steps and said first and second wireless terminals, wireless terminals having different channel quality conditions being selected as said first and second wireless terminals.

29. The method of claim 1, further comprising:

combining at least some non-zero modulation symbols corresponding to the first set of data with at least some non-zero modulation symbols corresponding to the second set of data prior to transmitting said first and second sets of data.

30. The method of claim 29, wherein said step of combining includes punching at least some non-zero modulation symbols corresponding to the second set of data with non-zero modulation symbols used to communicate data from said first set of data.

58. The method of claim 1, further comprising:

performing, using said first set of data as an input, a combination of position coding and at least one of phase and amplitude modulation to generate a first modulation symbol stream having a predictable number of zero modulation symbols on average, said at least some non-zero modulation symbols and some zero modulation symbols used to transmit said first set of data being included in said first modulation symbol stream.

59. The method of claim 58, wherein the position of said zero modulation symbols in said first modulation symbol stream is a function of data included in said first set of data.

60. The method of claim 58, wherein said step of performing at least one of phase and amplitude modulation includes performing a QPSK modulation operation.

61. The method of claim 58, further comprising:

performing a modulation operation, using said second set of data, to generate a second stream of modulation symbols, said second stream of modulation symbols including said modulation symbols transmitted on said at least some of said minimum transmission units used to transmit said first set of data.

62. The method of claim 61, wherein non-zero modulation symbols corresponding to the first and second sets of data are transmitted at different power levels.

63. The method of claim 62, wherein non-zero modulation symbols corresponding to the first set of data are transmitted at a higher power level than non-zero modulation symbols corresponding to the second set of data.

31. A communications apparatus, the apparatus comprising:

means for processing a first set of data to generate a first set of modulation symbols including information to be communicated in a transmission segment including a plurality of minimum transmission units, the first set of modulation symbols including at least some non-zero modulation symbols and some zero modulation symbols, the first set of data being communicated by a combination of position coding with the position of non-zero modulation symbols within the first segment communicating at least some information and at least one of phase and amplitude modulation of the transmitted non-zero modulation symbols communicating additional information;

means for processing a second set of data to generate a second set of modulation symbols to be transmitted on at least some of said minimum transmission units used to transmit said first set of data; and

means for transmitting modulation symbols corresponding to said first segment generated by said means for processing a first set of data and means for processing a second set of data.

32. The apparatus of claim 31, wherein said minimum transmission unit is an OFDM tone-symbol.

33. The apparatus of claim 31, further comprising:

means for controlling the transmission power levels of non-zero modulation symbols used to communicate said first set of data and modulation symbols used to communicate said second set of data to maintain a minimum power difference.

34. The apparatus of claim 33, wherein said minimum power difference is such that the non-zero modulation symbols used in communicating the first set of data are transmitted at a higher power level than non-zero modulation symbols used to communicate the second set of data.

35. The apparatus of claim 31, wherein said means for processing a first set of data includes means for coding and modulating information at a first information bit per minimum transmission unit data rate;

and

wherein said means for processing a second set of data includes means for coding and modulating information at a second information bit per minimum transmission unit data rate, said second information bit per minimum transmission unit data rate being different from the first information bit per minimum transmission unit data rate.

36. The apparatus of claim 35, wherein the second information bit per minimum transmission unit data rate is higher than said first information bit per minimum transmission unit data rate.

37. The apparatus of claim 35, wherein said means for processing a first set of data includes means for selecting a zero symbol rate at which said means for processing a first set of data is to operate, said selected zero symbol rate being one of a plurality of zero symbol rates supported by said means for processing a first set of data, said zero symbol rate being a ratio of zero modulation symbols to zero modulation symbols and non-zero modulation symbols generated by said means for processing a first set of data.

38. The apparatus of claim 37, wherein said selected zero symbol rate is a zero symbol rate greater than or equal to 0.125 when the information bits per minimum transmission unit data rate used to transmit said first set of data is less than or equal to 1.5.

39. The apparatus of claim 37, wherein if said zero symbol rate is greater than or equal to 0.125, the information bits per minimum transmission unit data rate used to transmit said first set of data is less than or equal to 1.5;

and

wherein if the zero symbol rate is greater than or equal to 0.25, the information bits per minimum transmission unit data rate used to transmit said first set of data is less than or equal to 1.

40. The apparatus of claim 37, wherein said selected zero symbol rate is a zero symbol rate greater than or equal to 0.5 when the information bits per minimum transmission unit data rate used to transmit said first set of data is less than or equal to 0.5.

41. The apparatus of claim 37, wherein said selected zero symbol rate is a zero symbol rate greater than or equal to 0.75 when the information bits per minimum transmission unit data rate used to transmit said first set of data is less than or equal to ⅓

.

42. The apparatus of claim 37, wherein said selected zero symbol rate is a zero symbol rate greater than or equal to 0.875 when the information bits per minimum transmission unit data rate used to transmit said first set of data is less than or equal to ⅙

.

43. The apparatus of claim 37, wherein said means for processing a first set of data includes means for performing QPSK modulation to generate non-zero symbol values.

44. The apparatus of claim 37, wherein said means for processing a first set of data includes means for using QPSK modulation to generate non-zero modulation symbol values;

wherein if said selected zero symbol rate is greater than or equal to 0.75, the information bits per minimum transmission unit data rate used to transmit said first set of data is less than or equal to ⅓

; and

wherein if said selected zero symbol rate is greater than or equal to 0.875, the information bits per minimum transmission unit used to transmit said first set of data is less than or equal to ⅙

.

45. The apparatus of claim 37, further comprising:

means for partitioning said channel segment into a plurality of sub-segments for use in transmitting said first set of data, said portion being one of said sub-segments.

46. The apparatus of claim 45, wherein said segment is not partitioned for use in transmitting said second set of data.

47. The apparatus of claim 37, further comprising,

means for coding information bits included in said first set of data to generate coded information bits prior to said transmitting the first set of data;

means for determining the position of at least one non-zero symbol value in said portion based on the value of at least one of the coded information bits; and

means for determining at least one of the phase and amplitude of said non-zero modulation symbol based on the value of at least another one of the coded information bits.

48. The apparatus of claim 47, wherein said first set of data includes data having a first priority and data having a second priority, said second priority being lower than said first priority;

wherein said high priority data is communicated through position encoding; and

wherein said low priority data is communicated through phase encoding.

49. The apparatus of claim 31, wherein said segment is a downlink traffic channel segment, and

wherein said means for processing a first set of data encode and modulate information at a first information bit per minimum transmission unit data rate.

50. The apparatus of claim 49, further comprising:

means for selecting a wireless terminal from a plurality of wireless terminals based on information indicative of channel condition quality between a transmitter used to transmit to said wireless terminal and said wireless terminal.

51. The apparatus of claim 31, further comprising:

means for combining at least some non-zero modulation symbols corresponding to the first set of data with at least some non-zero modulation symbols corresponding to the second set of data prior to transmitting said first and second sets of data.

52. The apparatus of claim 51, wherein said means for combining includes means for punching at least some non-zero modulation symbols corresponding to the second set of data with non-zero modulation symbols used to communicate data from said first set of data.

53. A non-transitory computer readable medium embodying instructions for controlling an apparatus to perform a method of transmitting sets of data, the method comprising:

transmitting in a transmission segment including a plurality of minimum transmission units, a first set of data using at least some non-zero modulation symbols and some zero modulation symbols, the first set of data being communicated by a combination of position coding with the position of non-zero modulation symbols within the first segment communicating at least some information and at least one of phase and amplitude modulation of the transmitted non-zero modulation symbols communicating additional information; and

transmitting in said transmission segment a second set of data using modulation symbols transmitted on at least some of said minimum transmission units used to transmit said first set of data.

54. The non-transitory computer readable medium of claim 53, wherein said minimum transmission unit is an OFDM tone-symbol.

55. The non-transitory computer readable medium of claim 53, further embodying instruction for:

controlling the transmission power levels of non-zero modulation symbols used to communicate said first set of data and modulation symbols used to communicate said second set of data to maintain a minimum power difference.

56. The non-transitory computer readable medium of claim 55, wherein said minimum power difference is such that the non-zero modulation symbols used in communicating the first set of data are transmitted at a higher power level than non-zero modulation symbols used to communicate the second set of data.

57. The non-transitory computer readable medium of claim 53, further embodying instructions for:

transmitting information at a first information bit per minimum transmission unit data rate as part of said step of transmitting a first set of data; and

transmitting information at a second information bit per minimum transmission unit data rate as part of said step of transmitting a second set of data, said second information bit per minimum transmission unit data rate being different from the first information bit per minimum transmission unit data rate.