GB2374216A - Method and arrangement for automatic gain control of received signals - Google Patents

Method and arrangement for automatic gain control of received signals Download PDF

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Publication number
GB2374216A
GB2374216A GB0204011A GB0204011A GB2374216A GB 2374216 A GB2374216 A GB 2374216A GB 0204011 A GB0204011 A GB 0204011A GB 0204011 A GB0204011 A GB 0204011A GB 2374216 A GB2374216 A GB 2374216A
Authority
GB
United Kingdom
Prior art keywords
demodulator
receiver
signal processing
arrangement
samples
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
GB0204011A
Other versions
GB0204011D0 (en
GB2374216B (en
Inventor
Ning He
Goeran Klang
Torbjoern Ripstrand
Thomas Oestman
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson 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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of GB0204011D0 publication Critical patent/GB0204011D0/en
Publication of GB2374216A publication Critical patent/GB2374216A/en
Application granted granted Critical
Publication of GB2374216B publication Critical patent/GB2374216B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • H04B1/0003—Software-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
    • H04B1/0007—Software-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
    • H04B1/0014—Software-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
    • 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
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/26—Circuits for superheterodyne receivers
    • H04B1/28—Circuits for superheterodyne receivers the receiver comprising at least one semiconductor device having three or more electrodes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
    • 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
    • H04B1/0003—Software-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
    • H04B1/0028—Software-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
    • H04B1/0039—Software-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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/52—TPC 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.

Description

(12) UK Patent Application 1g'GB 1'2 374 2 1 6 ARIA (43) Date of Printing
by UK Office 09.10.2002 (21) Application No 0204011.1 (51) INTCL7 H04B 7/005
(22) Date of Filing 05.09.2000 (52) UK CL (Edition T) (30) Priority Data H3G GCX (31) 9903235 (32) 10.09.1999 (33) SE
(56) Documents Cited by ISA (86) International Application Data WO 1993/010609 A1 US 5835527 A PCT/SE2000/001703 En 05.09.2000 US 5566201 A (87) International Publication Data (58) Field of Search by ISA
WO2001/020807 En 22.03.2001 INT CL7 H04B SE, OK, Fl, NO classes as above (71) Applicant(s) Telefonaktiebolaget L M Ericsson (publ) (74) Agent and/or Address for Service (Incorporated in Sweden) Haseltine Lake & Co SE-126-25, Stockholm, Sweden Imperial House, 15-19 Kingsway, LONDON, WC2B BUD, United Kingdom (72) Inventor(s) Ning He Goran Klang Torbj6rn Ripstrand Thomas dustman (54) Abstract Title Method and arrangement for automatic gain control of received signals (57) The present invention relates to a code division multiple access (COMA) 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.
\ Lit - _ À -4--
L: 3 =
12 13 18 163 14 15 161 162 =
D
GB0204011A 1999-09-10 2000-09-05 Method and arrangement for automatic gain control of received signals Expired - Fee Related GB2374216B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9903235A SE9903235L (en) 1999-09-10 1999-09-10 Method and apparatus of a telecommunication system
PCT/SE2000/001703 WO2001020807A1 (en) 1999-09-10 2000-09-05 Method and arrangement for automatic gain control of received signals

Publications (3)

Publication Number Publication Date
GB0204011D0 GB0204011D0 (en) 2002-04-03
GB2374216A true GB2374216A (en) 2002-10-09
GB2374216B GB2374216B (en) 2004-04-14

Family

ID=20416947

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0204011A Expired - Fee Related GB2374216B (en) 1999-09-10 2000-09-05 Method and arrangement for automatic gain control of received signals

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
EP1855387B1 (en) 2005-01-18 2016-11-30 NTT DoCoMo, Inc. Mobile communication terminal and method for controlling a plurality of receiving apparatuses mounted on mobile communication terminal

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993010609A1 (en) * 1991-11-19 1993-05-27 Interdigital Communications 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
US5835527A (en) * 1995-01-04 1998-11-10 Interdigital Technology Corporation Spread spectrum adaptive power control system and method

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08335928A (en) * 1995-06-07 1996-12-17 Oki Electric Ind Co Ltd Receiver
EP0923823B1 (en) * 1996-09-02 2002-11-13 STMicroelectronics N.V. Improvements in, or relating to, multi-carrier transmission systems
JP2970550B2 (en) * 1996-09-13 1999-11-02 日本電気株式会社 Batch demultiplexer
JPH10112682A (en) * 1996-10-03 1998-04-28 Canon Inc Radio communication system and transmission power control method and base station therefor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993010609A1 (en) * 1991-11-19 1993-05-27 Interdigital Communications 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
US5835527A (en) * 1995-01-04 1998-11-10 Interdigital Technology Corporation Spread spectrum adaptive power control system and method

Also Published As

Publication number Publication date
TW507429B (en) 2002-10-21
WO2001020807A1 (en) 2001-03-22
JP4488332B2 (en) 2010-06-23
GB0204011D0 (en) 2002-04-03
SE9903235L (en) 2001-03-11
AU7464100A (en) 2001-04-17
AR025612A1 (en) 2002-12-04
SE9903235D0 (en) 1999-09-10
GB2374216B (en) 2004-04-14
JP2003509949A (en) 2003-03-11

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20150905