CA2206819A1 - Ocdma code tracking system having phantom carrier signal - Google Patents
Ocdma code tracking system having phantom carrier signalInfo
- Publication number
- CA2206819A1 CA2206819A1 CA002206819A CA2206819A CA2206819A1 CA 2206819 A1 CA2206819 A1 CA 2206819A1 CA 002206819 A CA002206819 A CA 002206819A CA 2206819 A CA2206819 A CA 2206819A CA 2206819 A1 CA2206819 A1 CA 2206819A1
- Authority
- CA
- Canada
- Prior art keywords
- carrier signal
- tracking system
- code tracking
- code
- ocdma
- 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
Links
- 238000001514 detection method Methods 0.000 abstract 1
Classifications
-
- 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
- H04B1/7073—Synchronisation aspects
- H04B1/7085—Synchronisation aspects using a code tracking loop, e.g. a delay-locked loop
Abstract
An OCDMA communication system in which channel signals are bandwidth spread according to a PN code and each channel is identified by a selected one of a set of RW code accesses. The set of RW codes is reduced by a predetermined one (preferably RWo). Each transceiver has acquisition and tracking circuitry which search for a null (e.g., the unsent RW access code) falling lower than a predetermined threshold value and synchronizing tracking on detection of the null.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/353,538 | 1994-12-09 | ||
US08/353,538 US5574721A (en) | 1994-12-09 | 1994-12-09 | Orthogonal code tracking system having phantom carrier signal |
PCT/US1995/015833 WO1996018255A1 (en) | 1994-12-09 | 1995-12-11 | Ocdma code tracking system having phantom carrier signal |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2206819A1 true CA2206819A1 (en) | 1996-06-13 |
CA2206819C CA2206819C (en) | 2001-05-08 |
Family
ID=23389556
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002206819A Expired - Fee Related CA2206819C (en) | 1994-12-09 | 1995-12-11 | Ocdma code tracking system having phantom carrier signal |
Country Status (9)
Country | Link |
---|---|
US (1) | US5574721A (en) |
EP (1) | EP0796532B1 (en) |
JP (1) | JPH10510406A (en) |
KR (1) | KR19980700761A (en) |
AT (1) | ATE243902T1 (en) |
AU (1) | AU4417096A (en) |
CA (1) | CA2206819C (en) |
DE (1) | DE69531164D1 (en) |
WO (1) | WO1996018255A1 (en) |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5768306A (en) * | 1993-09-06 | 1998-06-16 | Ntt Mobile Communications Network, Inc. | Sliding correlator used in CDMA systems to establish initial synchronization |
KR960015842B1 (en) * | 1994-07-14 | 1996-11-22 | 삼성전자 주식회사 | Pn code synchronization device |
US5729570A (en) * | 1994-12-08 | 1998-03-17 | Stanford Telecommunications, Inc. | Orthogonal code division multiple access communication system having multicarrier modulation |
US5805584A (en) * | 1996-02-23 | 1998-09-08 | L-3 Communications Corporation | Multi-user acquisition procedure for point-to-multipoint synchronous CDMA systems |
US5898362A (en) * | 1997-06-02 | 1999-04-27 | Motorola, Inc. | System for transmitting and receiving polarized CDMA signals and method of operation thereof |
US6456644B1 (en) | 1997-06-23 | 2002-09-24 | Cellnet Data Systems, Inc. | Bandpass correlation of a spread spectrum signal |
US6178197B1 (en) | 1997-06-23 | 2001-01-23 | Cellnet Data Systems, Inc. | Frequency discrimination in a spread spectrum signal processing system |
US6047016A (en) * | 1997-06-23 | 2000-04-04 | Cellnet Data Systems, Inc. | Processing a spread spectrum signal in a frequency adjustable system |
US6741638B2 (en) | 1997-06-23 | 2004-05-25 | Schlumbergersema Inc. | Bandpass processing of a spread spectrum signal |
US6628699B2 (en) | 1997-06-23 | 2003-09-30 | Schlumberger Resource Management Systems, Inc. | Receiving a spread spectrum signal |
US5987016A (en) * | 1997-11-04 | 1999-11-16 | Motorola, Inc. | Method and apparatus for tracking a communication signal in a wireless communication system |
US6570844B1 (en) | 1997-12-29 | 2003-05-27 | Alcatel Usa Sourcing, L.P. | System and method for providing redundancy in a telecommunications system |
US6512755B1 (en) | 1997-12-29 | 2003-01-28 | Alcatel Usa Sourcing, L.P. | Wireless telecommunications access system |
WO2000014892A1 (en) * | 1998-09-08 | 2000-03-16 | University Of Hawaii | Spread-spectrum continuous-time analog correlator and method therefor |
US6711121B1 (en) * | 1998-10-09 | 2004-03-23 | At&T Corp. | Orthogonal code division multiplexing for twisted pair channels |
US7126982B1 (en) | 2000-07-21 | 2006-10-24 | L-3 Communications Corporation | Apparatus for rapid PN code acquistion |
US7372892B2 (en) * | 2002-04-29 | 2008-05-13 | Interdigital Technology Corporation | Simple and robust digital code tracking loop for wireless communication systems |
US7876837B2 (en) * | 2002-09-30 | 2011-01-25 | Motorola Mobility, Inc. | Method for reducing access noise in a spread spectrum communication system |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4460992A (en) * | 1982-11-04 | 1984-07-17 | The United States Of America As Represented By The Secretary Of The Army | Orthogonal CDMA system utilizing direct sequence pseudo noise codes |
US5103459B1 (en) * | 1990-06-25 | 1999-07-06 | Qualcomm Inc | System and method for generating signal waveforms in a cdma cellular telephone system |
US5204876A (en) * | 1991-03-13 | 1993-04-20 | Motorola, Inc. | Method and apparatus for providing high data rate traffic channels in a spread spectrum communication system |
US5204874A (en) * | 1991-08-28 | 1993-04-20 | Motorola, Inc. | Method and apparatus for using orthogonal coding in a communication system |
US5375140A (en) * | 1992-11-24 | 1994-12-20 | Stanford Telecommunications, Inc. | Wireless direct sequence spread spectrum digital cellular telephone system |
FR2706709B1 (en) * | 1993-06-16 | 1995-08-25 | Matra Communication | Synchronization method for code division multiple access radiotelephone communications. |
US5377226A (en) * | 1993-10-19 | 1994-12-27 | Hughes Aircraft Company | Fractionally-spaced equalizer for a DS-CDMA system |
-
1994
- 1994-12-09 US US08/353,538 patent/US5574721A/en not_active Expired - Fee Related
-
1995
- 1995-12-11 AT AT95943009T patent/ATE243902T1/en not_active IP Right Cessation
- 1995-12-11 WO PCT/US1995/015833 patent/WO1996018255A1/en active IP Right Grant
- 1995-12-11 DE DE69531164T patent/DE69531164D1/en not_active Expired - Lifetime
- 1995-12-11 AU AU44170/96A patent/AU4417096A/en not_active Abandoned
- 1995-12-11 EP EP95943009A patent/EP0796532B1/en not_active Expired - Lifetime
- 1995-12-11 CA CA002206819A patent/CA2206819C/en not_active Expired - Fee Related
- 1995-12-11 JP JP8517738A patent/JPH10510406A/en not_active Ceased
-
1997
- 1997-06-09 KR KR1019970703836A patent/KR19980700761A/en active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
KR19980700761A (en) | 1998-03-30 |
DE69531164D1 (en) | 2003-07-31 |
EP0796532B1 (en) | 2003-06-25 |
EP0796532A1 (en) | 1997-09-24 |
CA2206819C (en) | 2001-05-08 |
WO1996018255A1 (en) | 1996-06-13 |
US5574721A (en) | 1996-11-12 |
ATE243902T1 (en) | 2003-07-15 |
JPH10510406A (en) | 1998-10-06 |
AU4417096A (en) | 1996-06-26 |
EP0796532A4 (en) | 2002-03-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA2206819A1 (en) | Ocdma code tracking system having phantom carrier signal | |
BR9813026A (en) | Spreading pn code across multiple layers in a multi-user communications system | |
GB2347330A (en) | Method and apparatus for tracking a communication signal in a wireless communication system | |
CA2378404A1 (en) | Channel assignment apparatus and method for common packet channel in a wcdma mobile communication system | |
EP0987913A3 (en) | Spread spectrum cdma transmitter | |
BR9608879A (en) | Multiple access communication system by frequency division and double orthogonal code | |
CA2224684A1 (en) | Method and apparatus for determining signal strength in a spread spectrum communication system having a variable data rate | |
CA2205818A1 (en) | An improved multi-code code division multiple access receiver | |
CA2616764A1 (en) | Adaptive power control for a spread spectrum communications system and method | |
CA2173779A1 (en) | Spread spectrum signal receiver | |
DE69020606D1 (en) | Spread spectrum identification signal for communication systems. | |
CA2072876A1 (en) | Diversity receiver in a cdma cellular telephone system | |
CA2020455A1 (en) | Feed forward spread spectrum signal processor | |
AU2002240779A1 (en) | A method distinguishing line of sight (los) from non-line of sight (nlos) in cdma mobile communication system | |
WO2000013324A3 (en) | Pn sequence identifying device in cdma communication system | |
ID30242A (en) | METHODS AND SYSTEMS FOR PLACING ACTIVE CUSTOMERS IN A CDMA COMMUNICATION SYSTEM | |
CA2263187A1 (en) | Cdma system with dynamic multiple pilot channel assignment | |
WO1996001544A3 (en) | A reception method, and a receiver | |
CA2172431A1 (en) | Output light wavelength control method in optical communication system for transmitting optical signal output from optical transmitter, optical transmitter and optical transmitter/receiver used in the optical communication system, and optical communication system using the same | |
WO1998044670A3 (en) | A code synchronization unit and method | |
WO1997015997A3 (en) | A system for transferring data in re-assignable groups, a transmitter and a receiver for use in such a system, and a method for transferring, transmitting and receiving such data, and a signal comprising such data | |
AU697615B2 (en) | PN code synchronizing method and transmitter and receiver inspread spectrum communication systems | |
CA2203586A1 (en) | Fiber-optic transceiver for combined serial data and time code communication | |
CA2268198A1 (en) | A class of low cross correlation non-palindromic synchronization sequences for code tracking in synchronous multiple access communication systems | |
WO2001008315A3 (en) | Method for increasing the coverage area of a base station |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed | ||
MKLA | Lapsed |
Effective date: 20041213 |