SE9903235L - Method and apparatus in a telecommunications system - Google Patents

Method and apparatus in a telecommunications system

Info

Publication number
SE9903235L
SE9903235L SE9903235A SE9903235A SE9903235L SE 9903235 L SE9903235 L SE 9903235L SE 9903235 A SE9903235 A SE 9903235A SE 9903235 A SE9903235 A SE 9903235A SE 9903235 L SE9903235 L SE 9903235L
Authority
SE
Sweden
Prior art keywords
demodulator
receiver
signal processing
means
unit
Prior art date
Application number
SE9903235A
Other languages
Swedish (sv)
Other versions
SE9903235D0 (en
Inventor
Ning He
Goeran Klang
Torbjoern Ripstrand
Thomas Oestman
Original Assignee
Ericsson Telefon Ab L M
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 Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Priority to SE9903235A priority Critical patent/SE9903235L/en
Publication of SE9903235D0 publication Critical patent/SE9903235D0/en
Publication of SE9903235L publication Critical patent/SE9903235L/en

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/0003Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
    • H04B1/0007Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage
    • H04B1/0014Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage using DSP [Digital Signal Processor] quadrature modulation and demodulation
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03GCONTROL OF AMPLIFICATION
    • H03G3/00Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20Automatic control
    • H03G3/30Automatic control in amplifiers having semiconductor devices
    • H03G3/3052Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/0003Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
    • H04B1/0028Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at baseband stage
    • H04B1/0039Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at baseband stage using DSP [Digital Signal Processor] quadrature modulation and demodulation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/06Receivers
    • H04B1/16Circuits
    • H04B1/26Circuits for superheterodyne receivers
    • H04B1/28Circuits for superheterodyne receivers the receiver comprising at least one semiconductor device having three or more electrodes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/52TPC using AGC [Automatic Gain Control] circuits or amplifiers

Abstract

The present invention relates to a code division multiple access (CDMA) communication system, more particularly to an arrangement and a method in a receiver (10) to simplify and improve signal processing in the demodulator (11) of the receiver (10) by means of reducing the long term dynamic range of received signals and, thus, reducing the number of bits needed for coding of said signals. This is accomplished by a signal processing means (16) in the signal input paths in front of the demodulator (11), said means (16) including at least an improved digital AGC-unit (161), which scales incoming signal samples to a common and constant power level, and including a subsequent quantizer unit (162), which transforms the scaled signal samples to samples using a reduced number of bits. Due to this, the transmission bandwidth in the receiver unit is reduced and the signal processing in the demodulator is less complex.
SE9903235A 1999-09-10 1999-09-10 Method and apparatus in a telecommunications system SE9903235L (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE9903235A SE9903235L (en) 1999-09-10 1999-09-10 Method and apparatus in a telecommunications system

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
SE9903235A SE9903235L (en) 1999-09-10 1999-09-10 Method and apparatus in a telecommunications system
TW89116530A TW507429B (en) 1999-09-10 2000-08-16 Method and arrangement in a telecommunication system
GB0204011A GB2374216B (en) 1999-09-10 2000-09-05 Method and arrangement for automatic gain control of received signals
PCT/SE2000/001703 WO2001020807A1 (en) 1999-09-10 2000-09-05 Method and arrangement for automatic gain control of received signals
AU74641/00A AU7464100A (en) 1999-09-10 2000-09-05 Method and arrangement for automatic gain control of received signals
JP2001524264A JP4488332B2 (en) 1999-09-10 2000-09-05 Circuit used for communication system and receiver unit
ARP000104726 AR025612A1 (en) 1999-09-10 2000-09-08 Method and arrangement in a telecommunications system

Publications (2)

Publication Number Publication Date
SE9903235D0 SE9903235D0 (en) 1999-09-10
SE9903235L true SE9903235L (en) 2001-03-11

Family

ID=20416947

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9903235A SE9903235L (en) 1999-09-10 1999-09-10 Method and apparatus in a telecommunications system

Country Status (7)

Country Link
JP (1) JP4488332B2 (en)
AR (1) AR025612A1 (en)
AU (1) AU7464100A (en)
GB (1) GB2374216B (en)
SE (1) SE9903235L (en)
TW (1) TW507429B (en)
WO (1) WO2001020807A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4490446B2 (en) 2005-01-18 2010-06-23 株式会社エヌ・ティ・ティ・ドコモ Mobile communication terminal and method for controlling a plurality of receiving devices mounted on mobile communication terminal

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5299226A (en) * 1990-11-16 1994-03-29 Interdigital Technology Corporation Adaptive power control for a spread spectrum communications system and method
US5566201A (en) * 1994-09-27 1996-10-15 Nokia Mobile Phones Ltd. Digital AGC for a CDMA radiotelephone
US5574747A (en) * 1995-01-04 1996-11-12 Interdigital Technology Corporation Spread spectrum adaptive power control system and method
JPH08335928A (en) * 1995-06-07 1996-12-17 Oki Electric Ind Co Ltd Receiver
AT227913T (en) * 1996-09-02 2002-11-15 St Microelectronics Nv Improvements in or relating to multicarrier transmission systems
JP2970550B2 (en) * 1996-09-13 1999-11-02 日本電気株式会社 Bulk branching circuit
JPH10112682A (en) * 1996-10-03 1998-04-28 Canon Inc Radio communication system and transmission power control method and base station therefor

Also Published As

Publication number Publication date
WO2001020807A1 (en) 2001-03-22
JP2003509949A (en) 2003-03-11
SE9903235D0 (en) 1999-09-10
JP4488332B2 (en) 2010-06-23
GB2374216B (en) 2004-04-14
TW507429B (en) 2002-10-21
AR025612A1 (en) 2002-12-04
AU7464100A (en) 2001-04-17
GB0204011D0 (en) 2002-04-03
GB2374216A (en) 2002-10-09

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