CA2302691A1 - Method and apparatus for providing orthogonal spot beams, sectors, and picocells - Google Patents

Method and apparatus for providing orthogonal spot beams, sectors, and picocells Download PDF

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Publication number
CA2302691A1
CA2302691A1 CA002302691A CA2302691A CA2302691A1 CA 2302691 A1 CA2302691 A1 CA 2302691A1 CA 002302691 A CA002302691 A CA 002302691A CA 2302691 A CA2302691 A CA 2302691A CA 2302691 A1 CA2302691 A1 CA 2302691A1
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CA
Canada
Prior art keywords
pilot
sequence
walsh
walsh sequence
decovered
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
CA002302691A
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French (fr)
Other versions
CA2302691C (en
Inventor
Stein A. Lundby
Joseph P. Odenwalder
Edward G. Jr. Tiedemann
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Qualcomm Inc
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Individual
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Filing date
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Application filed by Individual filed Critical Individual
Publication of CA2302691A1 publication Critical patent/CA2302691A1/en
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Publication of CA2302691C publication Critical patent/CA2302691C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/204—Multiple access
    • H04B7/216—Code division or spread-spectrum multiple access [CDMA, SSMA]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/246—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for base stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2628—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/004—Orthogonal
    • H04J13/0048—Walsh
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/10—Code generation
    • H04J13/102—Combining codes
    • H04J13/107—Combining codes by concatenation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70701—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation featuring pilot assisted reception
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/32—Hierarchical cell structures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information

Abstract

A method and apparatus for providing orthogonal spot beams (14a, 14b), sectors (16a, 16b), and picocells (18). The transmissions can be made orthogonal by using orthogonal auxiliary pilots and different Walsh traffic channels in adjacent areas. In accordance with the IS-95 standard, the pilot signal is covered with the 64-chip Walsh sequence zero.
The 64-chip all zeros Walsh sequence can be designated as P
and the 64-chip all one sequence can be designated as M. In the present invention, additional pilot signals can be provided by concatenating 64-chip all zeros P and all ones M sequences. Thus, for two pilot signals, pilot Walsh sequences of PP and PM can be used. For four pilot signals, pilot Walsh sequences of PPPP, PMPM, PPMM, and PMMP can be used. The present invention can be extended such that any required number of pilot Walsh sequences can be generated by substituting each bit in an K-bit Walsh sequence with the 64-chip all zeros P or all ones M sequence depending on the value of that bit.

Claims (33)

1. A method for providing an auxiliary pilot comprising the steps of:
receiving pilot data; and covering said pilot data with a pilot Walsh sequence.
2. The method of claim 1 wherein said pilot Walsh sequence comprises a concatenated sequence of a basic Walsh sequence and its complementary sequence.
3. The method of claim 2 wherein said basic Walsh sequence comprises an all zeros sequence.
4. The method of claim 2 wherein said basic Walsh sequence is 64 chips in length.
5. The method of claim 2 wherein said pilot Walsh sequence is 128 chips in length.
6. The method of claim 2 wherein said pilot Walsh sequence is 256 chips in length.
7. The method of claim 2 wherein said pilot Walsh sequence is 64 times K chips in length, where K is a number of pilot Walsh sequences available.
8. The method of claim 1 wherein said pilot Walsh sequence comprises a K-bit sequence of a Walsh code mapping and wherein each bit of said K-bit sequence is substituted with a basic Walsh sequence or a complementary sequence depending on a value of said bit.
9. The method of claim 8 wherein said complementary sequence is derived by inverting each bit within said basic Walsh sequence.
10. The method of claim 8 wherein said complementary sequence is a second basic Walsh sequence.
11. The method of claim 1 wherein a gain of said auxiliary pilot is adjusted based on a gain of a particularized transmission wherein said auxiliary pilot is transmitted.
12. The method of claim 1 wherein a length of said pilot Walsh sequence is minimal based on a number of required pilot channel.
13. The method of claim 1 wherein one auxiliary pilot is provided for each particularized transmission.
14. The method of claim 1 wherein said pilot data for all auxiliary pilots is identical.
15. The method of claim 1 wherein said pilot data for all auxiliary pilots comprises an all ones sequence.
16. The method of claim 1 wherein said pilot data for all auxiliary pilots comprises an all zeros sequence.
17. A method for receiving an auxiliary pilot comprising the steps of receiving a pilot signal and providing pilot data;
accumulating said pilot data over a length of a basic Walsh sequence to provide I and Q pilot values;
accumulating I and Q pilot values for a current interval and previous intervals in accordance with a pilot hypothesis to provide a decovered pilot.
18. The method of claim 17 wherein said length of said basic Walsh sequence is 64 chips.
19. The method of claim 17 wherein said decovered pilot is compared against a set of predetermined threshold.
20. The method of claim 17 wherein a particularized transmission corresponding to said decovered pilot is added to a candidate set if said decovered pilot exceeds an add threshold.
21. The method of claim 17 wherein a particularized transmission corresponding to said decovered pilot is removed from a candidate set if said decovered pilot is below a drop threshold.
22. The method of claim 17 wherein a particularized transmission corresponding to said decovered pilot is added to an active set if said decovered pilot exceeds an add threshold.
23. The method of claim 17 wherein a particularized transmission corresponding to said decovered pilot is removed from an active set if said decovered pilot is below a drop threshold.
24. An apparatus for receiving an auxiliary pilot comprising:
a receiver for receiving a pilot signal and providing pilot data; and a pilot correlator for receiving said pilot data and providing a decovered pilot.
25. The apparatus of claim 24 wherein said pilot correlator computes said decovered pilot based on a pilot hypothesis.
26. The apparatus of claim 24 wherein said pilot correlator accumulates said pilot data over a length of a basic Walsh sequence to provide I and Q pilot values.
27. The apparatus of claim 24 wherein said pilot correlator accumulates said I and Q pilot values for a current interval and previous intervals in accordance with a pilot hypothesis to provide said decovered pilot.
28. A method for providing orthogonal particularized transmissions comprising the steps of:
covering traffic channels of each particularized transmission with different Walsh sequences; and covering pilot signals of each particularized transmission with different pilot Walsh sequences.
29. The method of claim 28 wherein said pilot Walsh sequences are derived from a basic Walsh sequence.
30. The method of claim 29 wherein said basic Walsh sequence is Walsh sequence zero.
31. A method for providing improved performance in a particularized transmission comprising the steps of:
covering traffic channels of said particularized transmission with Walsh sequences orthogonal to those of surrounding transmissions; and covering pilot signal of said particularized transmission with a pilot Walsh sequence orthogonal to those of surrounding transmissions.
32. The method of claim 31 wherein said pilot Walsh sequence is derived from a basic Walsh sequence.
33. The method of claim 32 wherein said basic Walsh sequence is Walsh sequence zero.
CA2302691A 1997-09-08 1998-09-08 Method and apparatus for providing orthogonal spot beams, sectors, and picocells Expired - Fee Related CA2302691C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/925,521 US6285655B1 (en) 1997-09-08 1997-09-08 Method and apparatus for providing orthogonal spot beams, sectors, and picocells
US08/925,521 1997-09-08
PCT/US1998/018713 WO1999013605A1 (en) 1997-09-08 1998-09-08 Method and apparatus for providing orthogonal spot beams, sectors, and picocells

Publications (2)

Publication Number Publication Date
CA2302691A1 true CA2302691A1 (en) 1999-03-18
CA2302691C CA2302691C (en) 2010-03-30

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CA2302691A Expired - Fee Related CA2302691C (en) 1997-09-08 1998-09-08 Method and apparatus for providing orthogonal spot beams, sectors, and picocells

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US (3) US6285655B1 (en)
EP (2) EP1013020B1 (en)
JP (3) JP4270746B2 (en)
KR (1) KR100821886B1 (en)
CN (2) CN100454791C (en)
AR (2) AR013658A1 (en)
AT (1) ATE353504T1 (en)
AU (1) AU753223B2 (en)
BR (1) BR9812281A (en)
CA (1) CA2302691C (en)
CZ (1) CZ300383B6 (en)
DE (1) DE69837044T2 (en)
DK (1) DK1013020T3 (en)
ES (1) ES2279581T3 (en)
FI (1) FI20000274A (en)
HU (1) HUP0003800A3 (en)
ID (1) ID27815A (en)
IL (1) IL134858A (en)
MX (1) MXPA00002390A (en)
NO (1) NO327536B1 (en)
NZ (1) NZ502724A (en)
PL (1) PL195114B1 (en)
RU (1) RU2199182C2 (en)
TR (1) TR200000621T2 (en)
TW (1) TW392396B (en)
WO (1) WO1999013605A1 (en)
ZA (1) ZA988164B (en)

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Publication number Publication date
CN1273720A (en) 2000-11-15
EP1746740A2 (en) 2007-01-24
ATE353504T1 (en) 2007-02-15
HUP0003800A3 (en) 2003-01-28
DK1013020T3 (en) 2007-05-07
DE69837044T2 (en) 2007-11-22
AR053444A2 (en) 2007-05-09
CA2302691C (en) 2010-03-30
US7680084B2 (en) 2010-03-16
TW392396B (en) 2000-06-01
CN100454791C (en) 2009-01-21
PL195114B1 (en) 2007-08-31
NO20001153D0 (en) 2000-03-07
PL342647A1 (en) 2001-06-18
TR200000621T2 (en) 2000-11-21
DE69837044D1 (en) 2007-03-22
ID27815A (en) 2001-04-26
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