Apparatus, method and computer program product providing joint detection for increasing throughout with data in uplink that multiplexes users using codes and that multiplexes users using frequency multiplexing

• US 20070201569A1
• Filed: 02/08/2007
• Published: 08/30/2007
• Est. Priority Date: 02/08/2006
• Status: Abandoned Application

• Current Assignee: Nokia Corporation
• Original Assignee: Nokia Corporation
• Inventors: Pajukoski, Kari, Tiirola, Esa
• Application Number:
  US11/703,943
• Publication Number:
  US 20070201569A1
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04B 1/69 Spread spectrum techniques
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04J 13/00 Code division multiplex systems for frequency hopping H04B1/713
• CPC Class Codes: H04L 2025/03414 Multicarrier
• CPC Class Codes: H04L 2025/03426 transmission using multiple-input and multiple-output channels
• CPC Class Codes: H04L 25/0228 with direct estimation from sounding signals
• CPC Class Codes: H04L 25/03063 using fractionally spaced delay lines or combinations of fractionally and integrally spaced taps
• CPC Class Codes: H04L 25/03159 operating in the frequency domain H04L25/03165, H04L25/03178 take precedence
• CPC Class Codes: H04L 25/03331 Arrangements for the joint estimation of multiple sequences
• CPC Class Codes: H04L 27/2607 Cyclic extensions
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04L 5/0016 Time-frequency-code
• 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

First information is detected in a received wideband signal. The first information is conveyed by a plurality of multiplexed frequency bands, individual ones of the multiplexed frequency bands corresponding to individual ones of first users and to a transport format. Detecting includes making data decisions corresponding to the first information. For each first user, a regenerated signal is created using the data decisions corresponding to that first user and the transport format. A resultant signal is created based on the regenerated signals for all of the first users and on the received wideband signal. Second information is detected in the resultant signal at least by using a number of spreading codes, individual ones of which are associated with individual ones of second users.

Claims

1. A method comprising:

detecting first information in a received wideband signal, the first information conveyed by a plurality of multiplexed frequency bands, individual ones of the multiplexed frequency bands corresponding to individual ones of first users and to a transport format, wherein detecting comprises making data decisions corresponding to the first information;

for each first user, creating a regenerated signal using the data decisions corresponding to that first user and the transport format;

creating a resultant signal based on the regenerated signals for all of the first users and on the received wideband signal; and

detecting second information in the resultant signal at least by using a plurality of spreading codes, individual ones of which are associated with individual ones of second users.

2. The method of claim 1, wherein creating a regenerated signal further comprises, for each first user, applying channel estimates to the regenerated signal corresponding to that first user.

3. The method of claim 1, wherein creating a resultant signal further comprises subtracting the regenerated signals for all of the first users from the received wideband signal to create the resultant signal.

4. The method of claim 3, wherein the method further comprises creating a single regenerated signal from all of the regenerated signals for all of the first users and subtracting the single regenerated signal from the received wideband signal to create the resultant signal.

5. The method of claim 1, wherein creating a resultant signal further comprises subtracting the regenerated signals for all of the first users from the received wideband signal to create the resultant signal.

6. The method of claim 1, wherein the second information occupies a first frequency band in the wideband signal and the first information occupies a second frequency band that at least partially overlaps the first frequency band.

7. The method of claim 1, wherein the transport format comprises a plurality of data blocks having cyclic prefixes and data portions and comprises a pilot data block comprising a cyclic prefix and a pilot signal.

8. The method of claim 1, wherein creating a regenerated signal further comprises, for each first user:

compressing a plurality of symbols in a symbol sequence corresponding to the data decisions into a symbol repetition block;

repeating the symbol repetition block a first predetermined number of times to create repeated symbols;

adding a cyclic prefix to the repeated symbols to create a data block;

performing compressing, repeating, and adding a second predetermined number of times in order to create a predetermined number of data blocks;

adding a pilot data block, comprising a pilot symbol and a cyclic prefix, to the data blocks; and

modulating the data blocks and the pilot data block using a user-specific phase vector to create the regenerated signal corresponding to that first user.

9. The method of claim 1, wherein the transport format is a first transport format, wherein detecting second information uses a second transport format, and wherein each of the first and second transport formats has a duration in a timeslot of ⅔

millisecond, includes 2560 chips used to store information, and is received using a chip rate of 3.84 million chips per second.

10. The method of claim 1, wherein detecting first information further comprises detecting undecoded bits and performing soft quantization on undecoded bits to make the data decisions.

11. The method of claim 1, wherein detecting first information further comprises decoding a portion of the wideband signal to create decoded bits and performing soft quantization on decoded bits to make the data decisions.

12. The method of claim 1, wherein detecting first information further comprises decoding a portion of the wideband signal to create decoded bits and performing hard quantization on the decoded bits to make the data decisions.

13. The method of claim 1, wherein each first user is assigned a different user-specific phase vector and detecting first information uses the user-specific phase vectors in order to determine to which user the first information belongs.

14. The method of claim 13, wherein each user-specific phase vector causes information transmitted by each user to occupy unique user-specific frequency bands in the multiplexed frequency bands and detecting first information uses the user-specific phase vectors to determine corresponding user-specific frequency bands.

15. A computer program product tangibly embodying a program of machine-readable instructions executable by at least one data processor to perform operations comprising:

detecting first information in a received wideband signal, the first information conveyed by a plurality of multiplexed frequency bands, individual ones of the multiplexed frequency bands corresponding to individual ones of first users and to a transport format, wherein detecting comprises making data decisions corresponding to the first information;

for each first user, creating a regenerated signal using the data decisions corresponding to that first user and the transport format;

creating a resultant signal based on the regenerated signals for all of the first users and on the received wideband signal; and

detecting second information in the resultant signal at least by using a plurality of spreading codes, individual ones of which are associated with individual ones of second users.

16. The computer program product of claim 15, wherein the operation of creating a resultant signal further comprises the operation of subtracting the regenerated signals for all of the first users from the received wideband signal to create the resultant signal.

17. The computer program product of claim 15, wherein the second information occupies a first frequency band in the wideband signal and the first information occupies a second frequency band that at least partially overlaps the first frequency band.

18. The computer program product of claim 15, wherein the operation of creating a regenerated signal further comprises the operations of, for each first user:

compressing a plurality of symbols in a symbol sequence corresponding to the data decisions into a symbol repetition block;

repeating the symbol repetition block a first predetermined number of times to create repeated symbols;

adding a cyclic prefix to the repeated symbols to create a data block;

performing compressing, repeating, and adding a second predetermined number of times in order to create a predetermined number of data blocks;

adding a pilot data block, comprising a pilot symbol and a cyclic prefix, to the data blocks;

modulating the data blocks and the pilot data block using a user-specific phase vector to create the regenerated signal corresponding to that first user; and

applying channel estimates to the regenerated signal corresponding to that first user.

19. The computer program product of claim 15, wherein the transport format is a first transport format, wherein the first transport format comprises a plurality of data blocks having cyclic prefixes and data portions and comprises a pilot data block comprising a cyclic prefix and a pilot signal, wherein the operation of detecting second information uses a second transport format, and wherein each transport format has a duration in a timeslot of ⅔

millisecond, includes 2560 chips used to store information, and is received using a chip rate of 3.84 million chips per second.

20. The computer program product of claim 15, wherein the operation of detecting first information further comprises the operations of detecting undecoded bits and performing soft quantization on undecoded bits to make the data decisions.

21. The computer program product of claim 15, wherein the operation of detecting first information further comprises the operations of decoding a portion of the wideband signal to create decoded bits and performing soft quantization on decoded bits to make the data decisions.

22. The computer program product of claim 15, wherein the operation of detecting first information further comprises the operation of decoding a portion of the wideband signal to create decoded bits and performing hard quantization on the decoded bits to make the data decisions.

23. The computer program product of claim 15, wherein each first user is assigned a different user-specific phase vector and the operation of detecting first information uses the user-specific phase vectors in order to determine to which user the first information belongs.

24. The computer program product of claim 23, wherein each user-specific phase vector causes information transmitted by each user to occupy unique user-specific frequency bands in the multiplexed frequency bands and the operation of detecting first information uses the user-specific phase vectors to determine corresponding user-specific frequency bands.

25. An apparatus comprising:

a first detector configured to detect first information in a received wideband signal, the first information conveyed by a plurality of multiplexed frequency bands, individual ones of the multiplexed frequency bands corresponding to individual ones of first users and to a transport format, wherein the first detector is configured, during detection, to make data decisions corresponding to the first information;

a regeneration module configured, for each first user, to create a regenerated signal using the data decisions corresponding to that first user and the transport format;

a device configured to create a resultant signal based on the regenerated signals for all of the first users and on the received wideband signal; and

a second detector configured to detect second information in the resultant signal at least by using a plurality of spreading codes, individual ones of which are associated with individual ones of second users.

26. The apparatus of claim 25, wherein the device configured to create the resultant signal further comprises an adder configured to subtract the regenerated signals for all of the first users from the received wideband signal to create the resultant signal.

27. The apparatus of claim 25, further comprising at least one antenna coupled to the first detector and the adder and configured to receive the wideband signal.

28. The apparatus of claim 25, wherein the first detector, regeneration modules, adder, and second detector are formed at least partially as part of at least one integrated circuit.

29. The apparatus of claim 25, wherein the second information occupies a first frequency band in the wideband signal and the first information occupies a second frequency band that at least partially overlaps the first frequency band.

30. The apparatus of claim 25, wherein:

the regeneration module further comprises;

a compression module configured to compress a plurality of symbols in a symbol sequence corresponding to the data decisions for at least one of the first users into a symbol repetition block;

a repetition module configured to repeat the symbol repetition block a first predetermined number of times to create repeated blocks;

a cyclic prefix addition module configured to add a cyclic prefix to the repeated blocks to create a data block, wherein the compression module, repetition module, and cyclic prefix addition module operate in order to create a predetermined number of data blocks;

a pilot addition module configured to add a pilot data block, comprising a pilot symbol and a cyclic prefix, to the data blocks; and

a modulation module configured to modulate the data blocks and the pilot data block with at least one user-specific phase vector to create a regenerated signal corresponding to the at least one first user; and

the regeneration module is further configured to apply channel estimates to the regenerated signal corresponding to the at least one first user.

31. The apparatus of claim 30, wherein the regeneration module is configured to operate the compression module, repetition module, cyclic prefix module, pilot addition module, and modulation module for each of the first users to create the first information corresponding to each of the first users.

32. The apparatus of claim 30, wherein each of the compression module, repetition module, cyclic prefix module, pilot addition module, and modulation module operates on data corresponding to all of the first users to create first information corresponding to all of the first users.

33. The apparatus of claim 25, wherein the transport format is a first transport format, wherein the first transport format comprises a plurality of data blocks having cyclic prefixes and data portions and comprises a pilot data block comprising a cyclic prefix and a pilot signal, wherein the second detector is configured to us a second transport format, and wherein each transport format has a duration in a timeslot of ⅔

millisecond, includes 2560 chips used to store information, and is received using a chip rate of 3.84 million chips per second.

34. The apparatus of claim 25, wherein the first detector comprises a receiver configured to create undecoded bits from the wideband signal and comprises a soft quantizer configured to perform soft quantization on the undecoded bits to make the data decisions.

35. The apparatus of claim 25, wherein the first detector comprises a receiver configured to create undecoded bits from the wideband signal, wherein the first detector comprises a decoder configured to create decoded bits from the undecoded bits, and wherein the first detector further comprises a soft quantizer configured to perform soft quantization on the decoded bits to make the data decisions.

36. The apparatus of claim 25, wherein the first detector comprises a receiver configured to create undecoded bits from the wideband signal, wherein the first detector comprises a decoded configured to create decoded bits from the undecoded bits, and wherein the first detector comprises a hard quantizer configured to perform hard quantization on the decoded bits to make the data decisions.

37. The apparatus of claim 25, wherein each first user is assigned a different user-specific phase vector and detecting information in the wideband signal corresponding to a plurality of multiplexed frequency bands uses the user-specific phase vectors.

38. An apparatus comprising:

means for detecting first information in a received wideband signal, the first information conveyed by a plurality of multiplexed frequency bands, individual ones of the multiplexed frequency bands corresponding to individual ones of first users and to a transport format, wherein the means for detecting first information is configured, during detection, to make data decisions corresponding to the first information;

means for creating, for each first user, a regenerated signal using the data decisions corresponding to that first user and the transport format;

means for creating a resultant signal based on the regenerated signals for all of the first users and on the received wideband signal; and

means for detecting second information in the resultant signal at least by using a plurality of spreading codes, individual ones of which are associated with individual ones of second users.

39. The apparatus of claim 38, wherein the second information occupies a first frequency band in the wideband signal and the first information occupies a second frequency band that at least partially overlaps the first frequency band.