CA2543771A1 - Frequency division multiplexing of multiple data streams in a wireless multi-carrier communication system - Google Patents

Frequency division multiplexing of multiple data streams in a wireless multi-carrier communication system Download PDF

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Publication number
CA2543771A1
CA2543771A1 CA002543771A CA2543771A CA2543771A1 CA 2543771 A1 CA2543771 A1 CA 2543771A1 CA 002543771 A CA002543771 A CA 002543771A CA 2543771 A CA2543771 A CA 2543771A CA 2543771 A1 CA2543771 A1 CA 2543771A1
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CA
Canada
Prior art keywords
data
slots
stream
symbol
slot
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002543771A
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French (fr)
Other versions
CA2543771C (en
Inventor
Rajiv Vijayan
Gordon Kent Walker
Raghuraman Krishnamoorthi
Ramaswamy Murali
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Qualcomm Inc
Original Assignee
Qualcomm Incorporated
Rajiv Vijayan
Gordon Kent Walker
Raghuraman Krishnamoorthi
Ramaswamy Murali
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Filing date
Publication date
Priority claimed from US10/932,586 external-priority patent/US7221680B2/en
Application filed by Qualcomm Incorporated, Rajiv Vijayan, Gordon Kent Walker, Raghuraman Krishnamoorthi, Ramaswamy Murali filed Critical Qualcomm Incorporated
Publication of CA2543771A1 publication Critical patent/CA2543771A1/en
Application granted granted Critical
Publication of CA2543771C publication Critical patent/CA2543771C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H04L5/0039—Frequency-contiguous, i.e. with no allocation of frequencies for one user or terminal between the frequencies allocated to another
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H04L5/0046—Determination of how many bits are transmitted on different sub-channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Techniques for multiplexing multiple data streams using frequency division multiplexing (FDM) in an OFDM system are described. M disjoint "interlaces"
are formed with U usable subbands. Each interlace is a different set of S
subbands, where . The subbands for each interlace are interlaced with the subbands for each of the other interlaces. M slots may be defined for each symbol period and assigned slot indices 1 through M. The slot indices may be mapped to interlaces such that (1) frequency diversity is achieved for each slot index and (2) the interlaces used for pilot transmission have varying distances to the interlaces used for each slot index, which improves channel estimation performance. Each data stream may be processed as data packets of a fixed size, and different numbers of slots may be used for each data packet depending on the coding and modulation scheme used for the data packet.

Claims (47)

1. A method of transmitting data in a wireless mufti-Garner communication system, comprising:
allocating slots to each of a plurality of data symbol streams, wherein each slot is a unit of transmission and a plurality of slots are frequency division multiplexed in each symbol period;
multiplexing data symbols in each data symbol stream onto the slots allocated to the data symbol stream; and forming a composite symbol stream with multiplexed data symbols for the plurality of data symbol streams, wherein the plurality of data symbol streams are independently recoverable by a receiver.
2. The method of claim 1, further comprising:
forming a plurality of non-overlapping interlaces with U frequency subbands usable for transmission, where U > 1 and each interlace is a different set of frequency subbands selected from among the U frequency subbands; and mapping the plurality of slots in each symbol period to the plurality of interlaces.
3. The method of claim 1, further comprising:
forming 2N non-overlapping interlaces with a plurality of frequency subbands usable for transmission, where N >= 1 each interlace is a different set of frequency subbands selected from among the plurality of frequency subbands; and mapping the plurality of slots in each symbol period to the 2N interlaces.
4. The method of claim 3, wherein N is equal to 1, 2, 3 or 4.
5. The method of claim 2, wherein the forming the plurality of non-overlapping interlaces comprises forming the plurality of interlaces with equal number of frequency subbands.
6. The method of claim 2, wherein the forming the plurality of non-overlapping interlaces comprises forming the plurality of interlaces with the frequency subbands in each interlace being interlaced with the frequency subbands in each of remaining interlaces.
7. The method of claim 2, wherein the forming the plurality of non-overlapping interlaces comprises forming a plurality of groups of frequency subbands, each group including frequency subbands uniformly distributed across T total frequency subbands in the system, where T >= U, and forming each interlace with frequency subbands selected from a respective group of frequency subbands.
8. The method of claim 2, wherein the allocating slots to each of the plurality of data symbol streams comprises allocating each of the plurality of interlaces to one data symbol stream, if at all, in each symbol period.
9. The method of claim 2, wherein the plurality of slots in each symbol period are identified by slot indices, the method further comprising:
for each symbol period, mapping the slot indices to the plurality of interlaces based on a mapping scheme.
10. The method of claim 9, wherein the mapping the slot indices to the plurality of interlaces comprises mapping each slot index used for data transmission to different ones of the plurality of interlaces in different symbol periods.
11. The method of claim 2, further comprising:
distributing data symbols multiplexed onto each allocated slot across the frequency subbands in the interlace to which the slot is mapped.
12. The method of claim 11, wherein the distributing the data symbols multiplexed onto each allocated slot comprises distributing data symbols for each data packet sent in the slot across the frequency subbands in the interlace to which the slot is mapped.
13. The method of claim 2, further comprising:
selecting slots for pilot transmission from among the plurality of slots in each symbol period; and multiplexing pilot symbols onto the slots used for pilot transmission.
14. The method of claim 13, further comprising:
mapping the slots used for pilot transmission to different interlaces in different symbol periods.
15. The method of claim 13, further comprising:
mapping the plurality of slots in each symbol period to the plurality of interlaces such that interlaces used for pilot transmission have varying distances to interlaces used for data transmission.
16. The method of claim 9, further comprising:
allocating at least one slot index for pilot transmission; and allocating remaining slot indices for data transmission.
17. The method of claim 16, further comprising:
mapping the at least one slot index used for pilot transmission to at least one predetermined interlace; and mapping each slot index used for data transmission to different interlaces in different symbol periods.
18. The method of claim 1, further comprising:
processing a plurality of data streams to obtain the plurality of data symbol streams, one data symbol stream for each data stream.
19. The method of claim 1, wherein the allocating the slots to each of the plurality of data symbol streams comprises allocating a particular number of slots to each data symbol stream based on at least one packet size and at least one coding and modulation scheme used for the data symbol stream.
20. The method of claim 18, wherein the processing the plurality of data streams comprises encoding data packets for each data stream in accordance with a coding scheme to generate coded packets for the data stream; and modulating the coded packets for each data stream in accordance with a modulation scheme to generate data symbols for the corresponding data symbol stream.
21. The method of claim 18, wherein the encoding the data packets for each data stream comprises encoding an integer number of data packets for each data stream in each frame of a predetermined time period, and wherein the allocating the slots to each of the plurality of data symbol streams comprises allocating an integer number of slots to each data symbol stream in each frame based on the number of data packets being transmitted in the frame for the corresponding data stream.
22. The method of claim 1, wherein the allocating the slots to each of the plurality of data symbol streams comprises allocating each data symbol stream a particular number of slots determined by decoding constraint and a coding and modulation scheme used for the data symbol stream.
23. An apparatus in a wireless multi-carrier communication system, comprising:
a controller operative to allocate slots to each of a plurality of data symbol streams, wherein each slot is a unit of transmission and a plurality of slots are frequency division multiplexed in each symbol period; and a data processor operative to multiplex data symbols in each data symbol stream onto the slots allocated to the data symbol stream and to form a composite symbol stream with multiplexed data symbols for the plurality of data symbol streams, wherein the plurality of data symbol streams are independently recoverable by a receiver.
24. The apparatus of claim 23, wherein the controller is further operative to form a plurality of non-overlapping interlaces with U frequency subbands usable for transmission, where U > 1, and to map the plurality of slots in each symbol period to the plurality of interlaces, each interlace being a different set of frequency subbands selected from among the U frequency subbands.
25. The apparatus of claim 24, wherein the plurality of slots in each symbol period are identified by slot indices, and wherein the data processor is further operative to, for each symbol period, map the slot indices to the plurality of interlaces based on a mapping scheme.
26. The apparatus of claim 23, wherein the controller is further operative to select slots for pilot transmission from among the plurality of slots in each symbol period, and wherein the data processor is further operative to multiplex pilot symbols onto the slots used for pilot transmission.
27. The apparatus of claim 23, wherein the controller is further operative to allocate a particular number slots to each data symbol stream based on at least one packet size and at least one coding and modulation scheme used for the data symbol stream.
28. The apparatus of claim 23, the data processor is further operative to process a plurality of data streams to obtain the plurality of data symbol streams, one data symbol stream for each data stream.
29. The apparatus of claim 23, wherein the wireless multi-carrier communication system utilizes orthogonal frequency division multiplexing (OFDM).
30. The apparatus of claim 23, wherein the wireless multi-carrier communication system is a broadcast system.
31. An apparatus in a wireless multi-carrier communication system, comprising:
means for allocating slots to each of a plurality of data symbol streams, wherein each slot is a unit of transmission and a plurality of slots are frequency division multiplexed in each symbol period;
means for multiplexing data symbols in each data symbol stream onto the slots allocated to the data symbol stream; and means for forming a composite symbol stream with multiplexed data symbols for the plurality of data symbol streams, wherein the plurality of data symbol streams are independently recoverable by a receiver
32. The apparatus of claim 31, further comprising:
means for forming a plurality of non-overlapping interlaces with U frequency subbands usable for transmission, where U > 1 and each interlace is a different set of frequency subbands selected from among the U frequency subbands; and means for mapping the plurality of slots in each symbol period to the plurality of interlaces.
33. The apparatus of claim 32, wherein the plurality of slots in each symbol period are identified by slot indices, the apparatus further comprising:
means for mapping the slot indices to the plurality of interlaces for each symbol period based on a mapping scheme.
34. The apparatus of claim 31, further comprising:
means for selecting slots for pilot transmission from among the plurality of slots in each symbol period; and means for multiplexing pilot symbols onto the slots used for pilot transmission.
35. The apparatus of claim 31, further comprising:
means for processing a plurality of data streams to obtain the plurality of data symbol streams, one data symbol stream for each data stream.
36. A method of receiving data in a wireless multi-carrier communication system, comprising:

selecting at least one data stream for recovery from among a plurality of data streams transmitted by a transmitter in the system;
determining slots used for each selected data stream, wherein each slot is a unit of transmission and a plurality of slots are frequency division multiplexed in each symbol period, wherein data symbols for each of the plurality of data streams are multiplexed onto slots allocated to the data stream, and wherein the plurality of data streams are independently recoverable by a receiver;
multiplexing detected data symbols obtained for slots used for each selected data stream onto a detected data symbol stream, wherein each detected data symbol is an estimate of a data symbol and at least one detected data symbol stream is obtained for the at least one data stream selected for recovery; and processing each detected data symbol stream to obtain a corresponding decoded data stream.
37. The method of claim 35, further comprising:
mapping the plurality of slots in each symbol period to a plurality of non-overlapping interlaces formed with U frequency subbands usable for transmission, where U > 1 and each interlace is a different set of frequency subbands selected from among the U frequency subbands,
38. The method of claim 37, wherein the plurality of slots in each symbol period are identified by slot indices, and wherein the mapping the plurality of slots in each symbol period comprises mapping the slot indices to the plurality of interlaces in each symbol period based on a mapping scheme.
39. The method of claim 36, further comprising:
performing a partial Fourier transform for each slot used for each selected data stream to obtain received data symbols for the slot, the partial Fourier transform being a Fourier transform for fewer than all frequency subbands in the system; and performing detection on the received data symbols for each slot used for each selected data stream to obtain detected symbols for the slot.
40. The method of claim 36, further comprising:

performing a partial Fourier transform for each slot used for pilot transmission to obtain a channel estimate for the slot.
41. The method of claim 40, further comprising:
deriving a channel estimate for each slot used for each selected data stream based on channel estimates obtained from slots used for pilot transmission.
42. An apparatus in a wireless multi-carrier communication system, comprising:
a controller operative to select at least one data stream for recovery from among a plurality of data streams transmitted by a transmitter in the system and to determine slots used for each selected data stream, wherein each slot is a unit of transmission and a plurality of slots are frequency division multiplexed in each symbol period, wherein data symbols for each of the plurality of data streams are multiplexed onto slots allocated to the data stream, and wherein the plurality of data streams are independently recoverable by a receiver; and a data processor operative to multiplex detected data symbols obtained for slots used for each selected data stream onto a detected data symbol stream and to process each detected data symbol stream to obtain a corresponding decoded data stream, wherein each detected data symbol is an estimate of a data symbol and at least one detected data symbol stream is obtained for the at least one data stream selected for recovery.
43. The apparatus of claim 42, wherein the controller is further operable to map the plurality of slots in each symbol period to a plurality of non-overlapping interlaces formed with U frequency subbands usable for transmission, where U >
1 and each interlace is a different set of frequency subbands selected from among the U
frequency subbands.
44. The apparatus of claim 42, further comprising:
a demodulator operative to perform a partial Fourier transform for each slot used for each selected data stream to obtain received data symbols for the slot and to perform detection on the received data symbols for each slot used for each selected data stream to obtain detected symbols for the slot.
45. An apparatus in a wireless multi-carrier communication system, comprising:
means for selecting at least one data stream for recovery from among a plurality of data streams transmitted by a transmitter in the system;
means for determining slots used for each selected data stream, wherein each slot is a unit of transmission and a plurality of slots are frequency division multiplexed in each symbol period, wherein data symbols for each of the plurality of data streams are multiplexed onto slots allocated to the data stream, and wherein the plurality of data streams are independently recoverable by a receiver;
means for multiplexing detected data symbols obtained for slots used for each selected data stream onto a detected data symbol stream, wherein each detected data symbol is an estimate of a data symbol and at least one detected data symbol stream is obtained for the at least one data stream selected for recovery; and means for processing each detected data symbol stream to obtain a corresponding decoded data stream.
46. The apparatus of claim 45, further comprising:
means for mapping the plurality of slots in each symbol period to a plurality of non-overlapping interlaces formed with U frequency subbands usable for transmission, where U > 1 and each interlace is a different set of frequency subbands selected from among the U frequency subbands.
47. The apparatus of claim 45, further comprising:
means for performing a partial Fourier transform for each slot used for each selected data stream to obtain received data symbols for the slot; and means for performing detection on the received data symbols for each slot used for each selected data stream to obtain detected symbols for the slot.
CA2543771A 2003-10-24 2004-10-21 Frequency division multiplexing of multiple data streams in a wireless multi-carrier communication system Expired - Fee Related CA2543771C (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
US51431503P 2003-10-24 2003-10-24
US60/514,315 2003-10-24
US55974004P 2004-04-05 2004-04-05
US60/559,740 2004-04-05
US10/932,586 US7221680B2 (en) 2003-09-02 2004-09-01 Multiplexing and transmission of multiple data streams in a wireless multi-carrier communication system
US10/932,586 2004-09-01
PCT/US2004/035042 WO2005041515A1 (en) 2003-10-24 2004-10-21 Frequency division multiplexing of multiple data streams in a wireless multi-carrier communication system

Publications (2)

Publication Number Publication Date
CA2543771A1 true CA2543771A1 (en) 2005-05-06
CA2543771C CA2543771C (en) 2010-04-20

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EP (1) EP1678906A1 (en)
JP (1) JP2007509586A (en)
KR (1) KR100944821B1 (en)
AU (1) AU2004307449C1 (en)
BR (1) BRPI0415840A (en)
CA (1) CA2543771C (en)
WO (1) WO2005041515A1 (en)

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