WO1995012924A1 - Spread spectrum spectral density techniques - Google Patents
Spread spectrum spectral density techniques Download PDFInfo
- Publication number
- WO1995012924A1 WO1995012924A1 PCT/US1994/012465 US9412465W WO9512924A1 WO 1995012924 A1 WO1995012924 A1 WO 1995012924A1 US 9412465 W US9412465 W US 9412465W WO 9512924 A1 WO9512924 A1 WO 9512924A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pseudo
- chip sequence
- random
- sequence
- data bits
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/10—Code generation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/10—Code generation
- H04J13/102—Combining 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
Definitions
- This invention relates to spectral density techniques for use with spread-spectrum modulation.
- a data stream may be modulated with a pseudo-random code, so that the energy of the modulated signal is spread over a bandwidth which is larger than the bandwidth of the data stream.
- Present regulations for communication in a band of electromagnetic spectrum in which spread-spectrum communication is allowed, generally require all parts of the modulated signal to be no more than +8 db power over the signal average, measured over a 3 KHZ resolution bandwidth.
- the modulated signal may at times not be sufficiently random to meet the regulatory requirement. Accordingly, it would be advantageous to generate a spread-spectrum signal using relatively short pseudo-random codes which meets the regulatory require ⁇ ment.
- the invention provides a spread-spectrum communication system in which the energy output is more smoothly dis- tributed than the length of the pseudo-random code would otherwise indicate.
- the invention provides a spread-spectrum communication system in which the code sequence is pseudo-randomly inverted on data-bit bound ⁇ aries, so that the code sequence appears longer, for energy spreading, than it otherwise would appear.
- Figure 1 shows a block diagram of a spread-spectrum communication transmitter and receiver.
- Figure 2 shows a block diagram for a pseudo-random code generator for use in a spread-spectrum communication system.
- FIG. 1 shows a block diagram of a spread-spectrum communication transmitter and receiver.
- a spread-spectrum transmitter 101 may comprise an input port 102 for input data 103, a chip sequence trans ⁇ mitter generator 104, a modulator 105, and a transmitting antenna 106 for transmitting a spread-spectrum signal 107.
- a spread-spectrum receiver 108 may comprise a receiver antenna 109, a chip sequence receiver generator 110, a demodulator 111, and an output port 112 for output data 113.
- a single chip sequence 114 is identically generated by both the transmitter generator 104 and the receiver generator 110, and appears essentially random to others not knowing the spreading code upon which it is based.
- Figure 2 shows a block diagram for a pseudo-random code generator for use in a spread-spectrum communication system.
- the transmitter generator 104 and the receiver genera ⁇ tor 110 may comprise a code generator 201, having an output 202 for the chip sequence 114.
- the chip sequence 114 may comprise a 63-chip maximal-length pseudo-random chip sequence, which is pseudo-randomly inverted by XOR-ing with a second chip sequence at each data bit boundary.
- the code generator 201 comprises a first generator 203 which generates a first code 204.
- the first code 204 may comprise a 63-chip linear maximal-length code.
- An output from the first generator 203 is coupled to a first input of an XOR gate 205.
- a second generator 206 is clocked at the same rate as the data stream, and generates a second code 207, which is coupled to a second input of the XOR gate 205.
- the output of the XOR gate 205 is coupled to the output 202 for the code generator 201.
- the code generator 201 thus generates a complete sequence of the first code 204 for each data bit, but pseudo-randomly inverts the first code 204 by XOR-ing it with the second code 207 at each data bit boundary (i.e., each full data bit is modulated either with the full length of the first code 204 or with the full length of the inverse of the first code 204) .
- the effect of pseudo-randomly inverting the first code 204 at each data bit boundary is to more smoothly distribute the energy of the modulated signal over the bandwidth it occupies.
- the first code 204 is 2" - 1 chips long, e.g., 63 chips long
- the second code 207 is 2 P - 1 chips long, e.g., 63 chips long
- the modulated signal has about 4 to 7 db maximum power over the signal average, measured in a 3 KHz resolution bandwidth.
- data information which is transmitted from transmitter to receiver
- data information which is transmitted from transmitter to receiver
- data could comprise both data and error-correcting codes, control information, or other signals, and that this would be within the scope and spirit of the invention.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7513326A JPH09504670A (en) | 1993-11-01 | 1994-10-31 | Spread spectrum spectral density technology |
KR1019960702228A KR960706233A (en) | 1993-11-01 | 1994-10-31 | Spread Spectrum Spectral Density Techniques |
EP95901086A EP0727111A4 (en) | 1993-11-01 | 1994-10-31 | Spread spectrum spectral density techniques |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/146,499 | 1993-11-01 | ||
US08/146,499 US5436941A (en) | 1993-11-01 | 1993-11-01 | Spread spectrum spectral density techniques |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995012924A1 true WO1995012924A1 (en) | 1995-05-11 |
Family
ID=22517657
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1994/012465 WO1995012924A1 (en) | 1993-11-01 | 1994-10-31 | Spread spectrum spectral density techniques |
Country Status (7)
Country | Link |
---|---|
US (2) | US5436941A (en) |
EP (1) | EP0727111A4 (en) |
JP (1) | JPH09504670A (en) |
KR (1) | KR960706233A (en) |
CA (1) | CA2174647A1 (en) |
IL (1) | IL111470A (en) |
WO (1) | WO1995012924A1 (en) |
Cited By (2)
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---|---|---|---|---|
GB2340700A (en) * | 1998-08-13 | 2000-02-23 | Ramar Technology Ltd | A technique to extend the jamming margin of a DSSS communication system |
EP1029398B1 (en) * | 1997-10-10 | 2009-11-25 | QUALCOMM Incorporated | Multi-layered pn code spreading in a multi-user communications system |
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US5436941A (en) * | 1993-11-01 | 1995-07-25 | Omnipoint Corporation | Spread spectrum spectral density techniques |
US6356607B1 (en) | 1995-06-05 | 2002-03-12 | Omnipoint Corporation | Preamble code structure and detection method and apparatus |
US5745484A (en) * | 1995-06-05 | 1998-04-28 | Omnipoint Corporation | Efficient communication system using time division multiplexing and timing adjustment control |
JP3707165B2 (en) * | 1996-11-01 | 2005-10-19 | ソニー株式会社 | Video transmission method, video processing method, video transmission device, and video processing device |
US6141373A (en) | 1996-11-15 | 2000-10-31 | Omnipoint Corporation | Preamble code structure and detection method and apparatus |
GB9700854D0 (en) * | 1997-01-16 | 1997-03-05 | Scient Generics Ltd | Sub-audible acoustic data transmission mechanism |
US6408019B1 (en) | 1997-12-29 | 2002-06-18 | Georgia Tech Research Corporation | System and method for communication using noise |
GB9917985D0 (en) | 1999-07-30 | 1999-09-29 | Scient Generics Ltd | Acoustic communication system |
WO2001097395A2 (en) * | 2000-06-12 | 2001-12-20 | Time Domain Corporation | A method and apparatus for applying codes having predefined properties |
JP2004511172A (en) * | 2000-09-29 | 2004-04-08 | 株式会社東芝 | Code detection circuit and code detection method |
EP1928109B1 (en) * | 2000-11-30 | 2012-05-23 | Intrasonics S.A.R.L. | Cellular telephone for collecting audience survey data |
AU2211102A (en) * | 2000-11-30 | 2002-06-11 | Scient Generics Ltd | Acoustic communication system |
US7339605B2 (en) * | 2004-04-16 | 2008-03-04 | Polycom, Inc. | Conference link between a speakerphone and a video conference unit |
WO2003061285A2 (en) * | 2001-12-24 | 2003-07-24 | Scientific Generics Limited | Captioning system |
AU2002308114A1 (en) * | 2002-03-29 | 2003-10-13 | Innogenetics N.V. | Hbv drug resistance drug resistance detection methods |
US8199791B2 (en) * | 2005-06-08 | 2012-06-12 | Polycom, Inc. | Mixed voice and spread spectrum data signaling with enhanced concealment of data |
GB2460306B (en) | 2008-05-29 | 2013-02-13 | Intrasonics Sarl | Data embedding system |
KR101007339B1 (en) * | 2008-11-06 | 2011-01-14 | 주식회사 텔레칩스 | Scrambler device by generating array of pseudo random binary number |
WO2020152739A1 (en) * | 2019-01-21 | 2020-07-30 | 三菱電機株式会社 | Transmission device and transmission method |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4774715A (en) * | 1987-03-11 | 1988-09-27 | Telesystems Slw Inc. | Device for demodulating a spread spectrum signal |
US5150377A (en) * | 1990-11-02 | 1992-09-22 | At&T Bell Laboratories | Direct sequence spread spectrum (dsss) communications system with frequency modulation utilized to achieve spectral spreading |
Family Cites Families (52)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4247942A (en) * | 1961-03-01 | 1981-01-27 | Ford Aerospace & Communications Corp. | Jam resistant communication system |
US3934203A (en) * | 1974-05-24 | 1976-01-20 | The United States Of America As Represented By The Secretary Of The Navy | Spread spectrum modem |
US4163944A (en) * | 1976-12-22 | 1979-08-07 | Ncr Corporation | Compensation circuit for an electrical signal mixer |
US4131484A (en) * | 1978-02-13 | 1978-12-26 | Western Electric Company, Inc. | Frequency adjusting a piezoelectric device by lasering |
US4425661A (en) * | 1981-09-03 | 1984-01-10 | Applied Spectrum Technologies, Inc. | Data under voice communications system |
US4479226A (en) * | 1982-03-29 | 1984-10-23 | At&T Bell Laboratories | Frequency-hopped single sideband mobile radio system |
CA1191905A (en) * | 1982-06-30 | 1985-08-13 | Canadian Patents And Development Limited/Societe Canadienne Des Brevets Et D'exploitation Limitee | Spread spectrum modem |
US4561089A (en) * | 1984-03-23 | 1985-12-24 | Sangamo Weston, Inc. | Correlation detectors for use in direct sequence spread spectrum signal receiver |
US4567588A (en) * | 1984-03-23 | 1986-01-28 | Sangamo Weston, Inc. | Synchronization system for use in direct sequence spread spectrum signal receiver |
US4601047A (en) * | 1984-03-23 | 1986-07-15 | Sangamo Weston, Inc. | Code division multiplexer using direct sequence spread spectrum signal processing |
DE3511430A1 (en) * | 1985-03-29 | 1986-10-02 | Philips Patentverwaltung Gmbh, 2000 Hamburg | METHOD FOR SYNCHRONIZING THE RECEIVING DEVICES IN A DIGITAL MULTIPLEX TRANSMISSION SYSTEM |
US4630283A (en) * | 1985-07-17 | 1986-12-16 | Rca Corporation | Fast acquisition burst mode spread spectrum communications system with pilot carrier |
AU593564B2 (en) * | 1985-07-24 | 1990-02-15 | Nec Corporation | Spread spectrum power line communications |
US4672658A (en) * | 1985-10-16 | 1987-06-09 | At&T Company And At&T Bell Laboratories | Spread spectrum wireless PBX |
US4724435A (en) * | 1985-11-06 | 1988-02-09 | Applied Spectrum Technologies, Inc. | Bi-directional data telemetry system |
US4703474A (en) * | 1986-02-28 | 1987-10-27 | American Telephone And Telegraph Company, At&T Bell Laboratories | Spread spectrum code-division-multiple-access (SS-CDMA) lightwave communication system |
US4837786A (en) * | 1986-08-07 | 1989-06-06 | Comstream Corporation | Technique for mitigating rain fading in a satellite communications system using quadrature phase shift keying |
US4807222A (en) * | 1986-08-25 | 1989-02-21 | American Telephone And Telegraph Company At&T Bell Laboratories | Cordless accessed high-speed high-capacity local area networks |
US4901307A (en) * | 1986-10-17 | 1990-02-13 | Qualcomm, Inc. | Spread spectrum multiple access communication system using satellite or terrestrial repeaters |
US4804938A (en) * | 1986-10-24 | 1989-02-14 | Sangamo Weston, Inc. | Distribution energy management system |
US4759034A (en) * | 1986-12-02 | 1988-07-19 | General Research Of Electronics, Inc. | Multi-step spread spectrum communication apparatus |
US4811357A (en) * | 1988-01-04 | 1989-03-07 | Paradyne Corporation | Secondary channel for digital modems using spread spectrum subliminal induced modulation |
US4805208A (en) * | 1988-01-15 | 1989-02-14 | Niravoice, Inc. | Modem compression system for telephone network |
GB2220824A (en) * | 1988-07-13 | 1990-01-17 | Philips Electronic Associated | Transmission system for sending two signals simultaneously on the same communications channel |
CH676179A5 (en) * | 1988-09-29 | 1990-12-14 | Ascom Zelcom Ag | |
JP2718978B2 (en) * | 1989-03-02 | 1998-02-25 | 株式会社トキメック | Data transmission method |
US5146471A (en) * | 1989-03-23 | 1992-09-08 | Echelon Systems Corporation | Correlator for spread spectrum communications systems |
US4943973A (en) * | 1989-03-31 | 1990-07-24 | At&T Company | Spread-spectrum identification signal for communications system |
AU619105B2 (en) * | 1989-04-21 | 1992-01-16 | Kokusai Denshin Denwa Co. Ltd. | Hybrid modulation satellite communication system |
US5022047A (en) * | 1989-08-07 | 1991-06-04 | Omnipoint Data Corporation | Spread spectrum correlator |
US5016255A (en) * | 1989-08-07 | 1991-05-14 | Omnipoint Data Company, Incorporated | Asymmetric spread spectrum correlator |
US5025452A (en) * | 1990-03-20 | 1991-06-18 | Andrew Corporation | Full-duplex, sub-band spread spectrum communications system |
US5166952A (en) * | 1990-05-24 | 1992-11-24 | Cylink Corporation | Method and apparatus for the reception and demodulation of spread spectrum radio signals |
US5157686A (en) * | 1990-05-24 | 1992-10-20 | Cylink Corporation | Method and apparatus for the modulation of spread spectrum radio signals |
US5253268A (en) * | 1990-05-24 | 1993-10-12 | Cylink Corporation | Method and apparatus for the correlation of sample bits of spread spectrum radio signals |
US5103459B1 (en) * | 1990-06-25 | 1999-07-06 | Qualcomm Inc | System and method for generating signal waveforms in a cdma cellular telephone system |
US5081642A (en) * | 1990-08-06 | 1992-01-14 | Omnipoint Data Company, Incorporated | Reciprocal saw correlator method and apparatus |
US5093840A (en) * | 1990-11-16 | 1992-03-03 | Scs Mobilecom, Inc. | Adaptive power control for a spread spectrum transmitter |
US5299226A (en) * | 1990-11-16 | 1994-03-29 | Interdigital Technology Corporation | Adaptive power control for a spread spectrum communications system and method |
EP0486834B1 (en) * | 1990-11-22 | 1995-11-22 | Ascom Tech Ag | Multi-access method and mobile radiocommunication system implementing said multi-access method |
DE59104600D1 (en) * | 1990-11-22 | 1995-03-23 | Ascom Tech Ag | Receiver for a DSSS signal. |
US5228056A (en) * | 1990-12-14 | 1993-07-13 | Interdigital Technology Corporation | Synchronous spread-spectrum communications system and method |
US5274665A (en) * | 1990-12-14 | 1993-12-28 | Interdigital Technology Corporation | Polyopoly overlapping spread spectrum communication system and method |
WO1992021195A1 (en) * | 1991-05-13 | 1992-11-26 | Omnipoint Corporation | Dual mode transmitter and receiver |
US5177766A (en) * | 1991-06-03 | 1993-01-05 | Spectralink Corporation | Digital clock timing generation in a spread-spectrum digital communication system |
US5179571A (en) * | 1991-07-10 | 1993-01-12 | Scs Mobilecom, Inc. | Spread spectrum cellular handoff apparatus and method |
JP2554219B2 (en) * | 1991-11-26 | 1996-11-13 | 日本電信電話株式会社 | Digital signal superposition transmission method |
ZA931077B (en) * | 1992-03-05 | 1994-01-04 | Qualcomm Inc | Apparatus and method for reducing message collision between mobile stations simultaneously accessing a base station in a cdma cellular communications system |
US5299227A (en) * | 1993-04-13 | 1994-03-29 | American Electronics, Inc. | Individual beacon identification system |
MY112371A (en) * | 1993-07-20 | 2001-05-31 | Qualcomm Inc | System and method for orthogonal spread spectrum sequence generation in variable data rate systems |
US5436941A (en) * | 1993-11-01 | 1995-07-25 | Omnipoint Corporation | Spread spectrum spectral density techniques |
US5383219A (en) * | 1993-11-22 | 1995-01-17 | Qualcomm Incorporated | Fast forward link power control in a code division multiple access system |
-
1993
- 1993-11-01 US US08/146,499 patent/US5436941A/en not_active Expired - Lifetime
-
1994
- 1994-10-31 EP EP95901086A patent/EP0727111A4/en not_active Withdrawn
- 1994-10-31 CA CA002174647A patent/CA2174647A1/en not_active Abandoned
- 1994-10-31 JP JP7513326A patent/JPH09504670A/en active Pending
- 1994-10-31 WO PCT/US1994/012465 patent/WO1995012924A1/en not_active Application Discontinuation
- 1994-10-31 IL IL11147094A patent/IL111470A/en not_active IP Right Cessation
- 1994-10-31 KR KR1019960702228A patent/KR960706233A/en not_active Application Discontinuation
-
1995
- 1995-07-24 US US08/506,207 patent/US5604767A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4774715A (en) * | 1987-03-11 | 1988-09-27 | Telesystems Slw Inc. | Device for demodulating a spread spectrum signal |
US5150377A (en) * | 1990-11-02 | 1992-09-22 | At&T Bell Laboratories | Direct sequence spread spectrum (dsss) communications system with frequency modulation utilized to achieve spectral spreading |
Non-Patent Citations (1)
Title |
---|
See also references of EP0727111A4 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1029398B1 (en) * | 1997-10-10 | 2009-11-25 | QUALCOMM Incorporated | Multi-layered pn code spreading in a multi-user communications system |
GB2340700A (en) * | 1998-08-13 | 2000-02-23 | Ramar Technology Ltd | A technique to extend the jamming margin of a DSSS communication system |
GB2340700B (en) * | 1998-08-13 | 2000-07-12 | Ramar Technology Ltd | A technique to extend the jamming margin of a DSSS communication system |
US6442191B1 (en) | 1998-08-13 | 2002-08-27 | Advanced Technology Ramar Ltd. | Technique to extend the jamming margin of a DSSS communication system |
Also Published As
Publication number | Publication date |
---|---|
KR960706233A (en) | 1996-11-08 |
US5604767A (en) | 1997-02-18 |
CA2174647A1 (en) | 1995-05-11 |
EP0727111A1 (en) | 1996-08-21 |
JPH09504670A (en) | 1997-05-06 |
EP0727111A4 (en) | 1998-01-07 |
US5436941A (en) | 1995-07-25 |
IL111470A0 (en) | 1994-12-29 |
IL111470A (en) | 1997-08-14 |
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