CA2202621A1 - Code acquisition in a cdma communication system using multiple walsh channels - Google Patents

Code acquisition in a cdma communication system using multiple walsh channels

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Publication number
CA2202621A1
CA2202621A1 CA002202621A CA2202621A CA2202621A1 CA 2202621 A1 CA2202621 A1 CA 2202621A1 CA 002202621 A CA002202621 A CA 002202621A CA 2202621 A CA2202621 A CA 2202621A CA 2202621 A1 CA2202621 A1 CA 2202621A1
Authority
CA
Canada
Prior art keywords
channels
integration
communication system
periods
signal
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
CA002202621A
Other languages
French (fr)
Other versions
CA2202621C (en
Inventor
Gordon Skinner (Deceased)
Brian Harms
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qualcomm Inc
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US08/497,240 external-priority patent/US5577025A/en
Application filed by Individual filed Critical Individual
Publication of CA2202621A1 publication Critical patent/CA2202621A1/en
Application granted granted Critical
Publication of CA2202621C publication Critical patent/CA2202621C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • 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

Landscapes

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

Abstract

A technique for using energy received by subscriber units over multiple orthogonal channels within a spread spectrum communication system to acquire signal timing by controlling signal amplitude integration intervals used in detecting such timing. Received signals (10, 14, 18) are despread (40, 60) and respective amplitues coherently integrated (42, 44, 46, 62) over periods that are divisible by factors of two into the length of Walsh functions used to generate orthogonal signal channels.
Non-coherent combinations of the results of this integration are subsequently formed (68) over periods that commence and terminate on Walsh function boundaries, and used to determine when a correct time offset has been selected for despreading signals. Additional advantages are realized by assigning signals that consistently provide a higher energy content such as paging, synchronization, and most frequently assigned traffic channels to specific orthogonal channels within the communication system. In exemplary embodiments, Welsh functions of length 128 are used as channelizing codes and a pilot signal is assigned to channel 0. This results in traffic channels or paging and synchronization functions being assigned to channel (64) when the integration periods are (64) chips long, and to channels (32, 64 and 96) when the periods are (32) chips long. In this manner, additional energy is available during the integration process for use in determining when correct signal acquisition timing offsets have been selected, without the use of additional hardware.
CA002202621A 1995-06-30 1996-06-28 Code acquisition in a cdma communication system using multiple walsh channels Expired - Fee Related CA2202621C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US497,240 1995-06-30
US08/497,240 US5577025A (en) 1995-06-30 1995-06-30 Signal acquisition in a multi-user communication system using multiple walsh channels
PCT/US1996/011125 WO1997002663A1 (en) 1995-06-30 1996-06-28 Code acquisition in a cdma communication system using multiple walsh channels

Publications (2)

Publication Number Publication Date
CA2202621A1 true CA2202621A1 (en) 1997-01-23
CA2202621C CA2202621C (en) 2005-11-15

Family

ID=35530895

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002202621A Expired - Fee Related CA2202621C (en) 1995-06-30 1996-06-28 Code acquisition in a cdma communication system using multiple walsh channels

Country Status (1)

Country Link
CA (1) CA2202621C (en)

Also Published As

Publication number Publication date
CA2202621C (en) 2005-11-15

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