WO1996032784A3 - Communications system and transmitting means therefor - Google Patents

Communications system and transmitting means therefor Download PDF

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Publication number
WO1996032784A3
WO1996032784A3 PCT/IB1996/000183 IB9600183W WO9632784A3 WO 1996032784 A3 WO1996032784 A3 WO 1996032784A3 IB 9600183 W IB9600183 W IB 9600183W WO 9632784 A3 WO9632784 A3 WO 9632784A3
Authority
WO
WIPO (PCT)
Prior art keywords
spreading sequence
mixers
transmitter
mixing means
encoded spreading
Prior art date
Application number
PCT/IB1996/000183
Other languages
French (fr)
Other versions
WO1996032784A2 (en
Inventor
Richard Charles Burbidge
Timothy James Moulsley
Original Assignee
Philips Electronics Nv
Philips Norden Ab
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
Application filed by Philips Electronics Nv, Philips Norden Ab filed Critical Philips Electronics Nv
Priority to KR1019960707037A priority Critical patent/KR970704274A/en
Priority to JP8530835A priority patent/JPH10501950A/en
Priority to EP96903167A priority patent/EP0765545A2/en
Publication of WO1996032784A2 publication Critical patent/WO1996032784A2/en
Publication of WO1996032784A3 publication Critical patent/WO1996032784A3/en

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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

Abstract

A spread spectrum communications system comprises a transmitter (40-50) and a receiver (52-64). The transmitter includes mixing means (42) having a first input for connection to a data source (40) and a second input for connection to means (44, 46) for providing a dc free encoded spreading sequence. The output from the mixing means (42) is applied to a pulse shaping filter (48), the output of which controls the frequency of a voltage controlled oscillator (50). The signal which is received at the receiver is applied to a frequency down converter (52) which produces quadrature related signals (I, Q) which are applied to first inputs of mixers (56, 58). A dc free encoded spreading sequence is provided by a spreading sequence source (60) and encoder (62) and is applied to second inputs of the mixers (56, 58); the applied encoded spreading sequence corresponds to that applied to the mixing means (42) in the transmitter. The despread outputs from the mixers (56, 58) are applied to a symbol estimator (64) which recovers the received data. Optionally, a plurality of dc free encoded spreading sequences may be stored in a ROM, and by applying an appropriate address signal to the ROM, a predetermined dc free encoded spreading sequence is applied to the filter (48).
PCT/IB1996/000183 1995-04-11 1996-03-08 Communications system and transmitting means therefor WO1996032784A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1019960707037A KR970704274A (en) 1995-04-11 1996-03-08 Communication systems and means of transmission therefor
JP8530835A JPH10501950A (en) 1995-04-11 1996-03-08 Communication system and transmission means therefor
EP96903167A EP0765545A2 (en) 1995-04-11 1996-03-08 Communications system and transmitting means therefor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9507449.8 1995-04-11
GBGB9507449.8A GB9507449D0 (en) 1995-04-11 1995-04-11 Communications system and transmitting means therefor

Publications (2)

Publication Number Publication Date
WO1996032784A2 WO1996032784A2 (en) 1996-10-17
WO1996032784A3 true WO1996032784A3 (en) 1997-01-03

Family

ID=10772852

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1996/000183 WO1996032784A2 (en) 1995-04-11 1996-03-08 Communications system and transmitting means therefor

Country Status (5)

Country Link
EP (1) EP0765545A2 (en)
JP (1) JPH10501950A (en)
KR (1) KR970704274A (en)
GB (1) GB9507449D0 (en)
WO (1) WO1996032784A2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5982807A (en) 1997-03-17 1999-11-09 Harris Corporation High data rate spread spectrum transceiver and associated methods
US6411646B1 (en) 1998-06-30 2002-06-25 Conexant Systems, Inc. Direct conversion time division duplex radio, direct sequence spread spectrum cordless telephone
JP3304914B2 (en) * 1999-03-31 2002-07-22 日本電気株式会社 Frequency correction method
TWI234374B (en) * 2003-03-04 2005-06-11 Realtek Semiconductor Corp Spread spectrum encoding method and spread spectrum encoding modulation method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4435822A (en) * 1982-05-19 1984-03-06 Sperry Corporation Coherent spread spectrum receiving apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4435822A (en) * 1982-05-19 1984-03-06 Sperry Corporation Coherent spread spectrum receiving apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATA AND COMPUTER COMMUNICATIONS, 1994, WILLIAM STALLINGS, by MACMILLAN PUBLISHING COMPANY, Chapter 3.1, page 103. *

Also Published As

Publication number Publication date
KR970704274A (en) 1997-08-09
JPH10501950A (en) 1998-02-17
EP0765545A2 (en) 1997-04-02
GB9507449D0 (en) 1995-05-31
WO1996032784A2 (en) 1996-10-17

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