EP0463104A4 - Dsp based radio with diminished power requirements - Google Patents

Dsp based radio with diminished power requirements

Info

Publication number
EP0463104A4
EP0463104A4 EP19900905882 EP90905882A EP0463104A4 EP 0463104 A4 EP0463104 A4 EP 0463104A4 EP 19900905882 EP19900905882 EP 19900905882 EP 90905882 A EP90905882 A EP 90905882A EP 0463104 A4 EP0463104 A4 EP 0463104A4
Authority
EP
European Patent Office
Prior art keywords
signal
power
signal processing
broadcast
amount
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.)
Withdrawn
Application number
EP19900905882
Other languages
French (fr)
Other versions
EP0463104A1 (en
Inventor
Arun Sobti
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.)
Motorola Solutions Inc
Original Assignee
Motorola Inc
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 Motorola Inc filed Critical Motorola Inc
Publication of EP0463104A1 publication Critical patent/EP0463104A1/en
Publication of EP0463104A4 publication Critical patent/EP0463104A4/en
Withdrawn legal-status Critical Current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
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • 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
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
    • H04W52/0274—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by switching on or off the equipment or parts thereof
    • H04W52/028—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by switching on or off the equipment or parts thereof switching on or off only a part of the equipment circuit blocks
    • H04W52/0283—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by switching on or off the equipment or parts thereof switching on or off only a part of the equipment circuit blocks with sequential power up or power down of successive circuit blocks, e.g. switching on the local oscillator before RF or mixer stages
    • 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
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
    • H04W52/0287—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level changing the clock frequency of a controller in the equipment
    • H04W52/0293—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level changing the clock frequency of a controller in the equipment having a sub-controller with a low clock frequency switching on and off a main controller with a high clock frequency
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • This invention relates generally to radios, and more particularly to radios that include a digital signal processor.
  • Radios generally function to receive broadcast signals. Usually, the user of a radio will not be interested in all of the signals that are broadcast on a communication resource (such as a particular frequency or a particular TDM time slot). Since many broadcast signals of interest include an identifying signal or other identifying indicia, many radios include a signal processor that examines the received broadcast signal to determine the presence of the identifying signal. If present, the radio can be further enabled to render the broadcast signal audible, visible, or otherwise as appropriate for that particular broadcast signal.
  • a communication resource such as a particular frequency or a particular TDM time slot.
  • radios remain squelched unless a carrier can be sensed on a particular monitored communication resource.
  • Other broadcast signals include special identifying signals, such as tone signals or subaudible digital signals, that the radio can recognize and respond to.
  • signals of interest can be prefaced with a specific identifying preamble, such as an ID for the intended radio.
  • DSPs digital signal processors
  • These processors typically receive digitized received signals. Further processing of the signal, equivalent to IF and discriminator processing, then occurs in the DSP in a digital manner. The resultant signal can then be converted into analog form and processed further as appropriate. For example, the resultant signal may be rendered audible in the case of a voice transmission.
  • DSPs consume a significant amount of power when operating. This becomes a particular problem when seeking to use a DSP in a portable radio with limited power resources. DSP power consumption becomes of particular concern when the DSP operates both in the presence and absence of a broadcast signal of interest. Typically, the DSP must operate even in the absence of a broadcast signal of interest because the DSP itself aids in detecting the presence of a broadcast signal of interest. Unless the broadcast signals of Interest occur at known times, the DSP must remain active in order to detect the signal when it occurs.
  • This invention allows a DSP to be used in a radio while avoiding the necessity of continuous DSP operation.
  • the invention includes generally two signal processing units; the first includes the DSP and the second includes a processing unit having lesser capabilities and smaller power requirements.
  • the DSP based signal processing unit functions to fully process broadcast signals of interest.
  • the low power processing unit functions to detect the presence of a broadcast signal of interest, and upon detecting such a signal, the low power processing unit enables the DSP based processing unit to begin functioning.
  • the high power requirements of the DSP based processing unit are necessitated only when a broadcast signal of interest exists. Otherwise, a lower power broadcast signal of interest detection mechanism monitors the communication resource.
  • Fig. 1 comprises a block diagram depiction of the invention
  • Fig. 2 comprises a block diagram depiction of the low power signal processing unit.
  • a radio includes generally an antenna (101) for receiving broadcast signals and an RF unit (102) for appropriately processing the received broadcast signals.
  • the received signals are then passed to a low power signal processing unit (106) and also through an appropriate gate (103) to a digital signal processing unit (104) (the latter typically including a DSP such as the Motorola 56000 and a microprocessor to control the DSP).
  • a digital signal processing unit (104) typically including a DSP such as the Motorola 56000 and a microprocessor to control the DSP.
  • the output of the digital signal processing unit (104) then couples to an appropriate amplifier (107) and speaker (108) or other output devices as appropriate to the type of message received.
  • the low power signal processing unit (106) includes an appropriate IF unit (201) for receiving the output signal from the RF unit (102), a discriminator (202) for processing the IF unit (201) output to aid in recovering the original modulating signal, and a processing unit (203) for examining the recovered signal and determining whether an appropriate identifying signal is present.
  • the processing unit (203) could be any relatively simple and low power device, such as a Motorola MC6303 processor.
  • the processing unit (203) of the low power signal processing unit Upon detecting the presence of a broadcast signal of interest, the processing unit (203) of the low power signal processing unit provides a signal to the gate (103), thereby allowing the RF signal to be provided to the digital signal processing unit (104). At the same time, the processing unit (203) provides an enable signal to the digital signal processing unit (104) to activate that unit and cause it to begin processing the incoming signal. So configured, the digital signal processing unit will operate only when a broadcast signal of interest can be detected. Otherwise, the low power signal processing unit will monitor the received broadcast signals and control the activation of the digital signal processing unit as a function of the presence and absence of a broadcast signal of interest.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Power Sources (AREA)

Abstract

A radio (100) having two signal processing paths, one including a digital signal processor (104) that consumes a relatively large amount of power and one including a signal processor (106) that consumes a relatively small amount of power. The low power processor (106) operates to monitor for broadcast signals of interest. Upon detecting such a signal, the low power processor (106) enables the digital signal processor (104) to facilitate proper signal processing.

Description

DSP BASED RADIO WITH DIMINISHED POWER REQUIREMENTS
Technical Field
This invention relates generally to radios, and more particularly to radios that include a digital signal processor.
Bac grouπd Art
Radios generally function to receive broadcast signals. Usually, the user of a radio will not be interested in all of the signals that are broadcast on a communication resource (such as a particular frequency or a particular TDM time slot). Since many broadcast signals of interest include an identifying signal or other identifying indicia, many radios include a signal processor that examines the received broadcast signal to determine the presence of the identifying signal. If present, the radio can be further enabled to render the broadcast signal audible, visible, or otherwise as appropriate for that particular broadcast signal.
For example, some radios remain squelched unless a carrier can be sensed on a particular monitored communication resource. Other broadcast signals include special identifying signals, such as tone signals or subaudible digital signals, that the radio can recognize and respond to. Yet other signals of interest can be prefaced with a specific identifying preamble, such as an ID for the intended radio.
In order to expand the capabilities and flexibility of radios, digitizers and digital signal processors (DSPs) have been used. These processors typically receive digitized received signals. Further processing of the signal, equivalent to IF and discriminator processing, then occurs in the DSP in a digital manner. The resultant signal can then be converted into analog form and processed further as appropriate. For example, the resultant signal may be rendered audible in the case of a voice transmission.
DSPs, however, consume a significant amount of power when operating. This becomes a particular problem when seeking to use a DSP in a portable radio with limited power resources. DSP power consumption becomes of particular concern when the DSP operates both in the presence and absence of a broadcast signal of interest. Typically, the DSP must operate even in the absence of a broadcast signal of interest because the DSP itself aids in detecting the presence of a broadcast signal of interest. Unless the broadcast signals of Interest occur at known times, the DSP must remain active in order to detect the signal when it occurs.
Summary of the Invention:
This invention allows a DSP to be used in a radio while avoiding the necessity of continuous DSP operation.
The invention includes generally two signal processing units; the first includes the DSP and the second includes a processing unit having lesser capabilities and smaller power requirements. The DSP based signal processing unit functions to fully process broadcast signals of interest. The low power processing unit functions to detect the presence of a broadcast signal of interest, and upon detecting such a signal, the low power processing unit enables the DSP based processing unit to begin functioning.
Through use of this invention, the high power requirements of the DSP based processing unit are necessitated only when a broadcast signal of interest exists. Otherwise, a lower power broadcast signal of interest detection mechanism monitors the communication resource.
Brief Description of the Drawings:
Fig. 1 comprises a block diagram depiction of the invention; Fig. 2 comprises a block diagram depiction of the low power signal processing unit.
Best Mode for Carrying out the Invention:
Referring to Fig. 1, a radio (100) includes generally an antenna (101) for receiving broadcast signals and an RF unit (102) for appropriately processing the received broadcast signals. The received signals are then passed to a low power signal processing unit (106) and also through an appropriate gate (103) to a digital signal processing unit (104) (the latter typically including a DSP such as the Motorola 56000 and a microprocessor to control the DSP). The output of the digital signal processing unit (104) then couples to an appropriate amplifier (107) and speaker (108) or other output devices as appropriate to the type of message received.
With reference to Fig. 2, the low power signal processing unit (106) includes an appropriate IF unit (201) for receiving the output signal from the RF unit (102), a discriminator (202) for processing the IF unit (201) output to aid in recovering the original modulating signal, and a processing unit (203) for examining the recovered signal and determining whether an appropriate identifying signal is present. The processing unit (203) could be any relatively simple and low power device, such as a Motorola MC6303 processor.
Upon detecting the presence of a broadcast signal of interest, the processing unit (203) of the low power signal processing unit provides a signal to the gate (103), thereby allowing the RF signal to be provided to the digital signal processing unit (104). At the same time, the processing unit (203) provides an enable signal to the digital signal processing unit (104) to activate that unit and cause it to begin processing the incoming signal. So configured, the digital signal processing unit will operate only when a broadcast signal of interest can be detected. Otherwise, the low power signal processing unit will monitor the received broadcast signals and control the activation of the digital signal processing unit as a function of the presence and absence of a broadcast signal of interest.

Claims

I claim:
1 ) A radio having signal receiving means for receiving broadcast signals, and digital signal processing means that requires a first amount of power to operate for converting the received broadcast signal into a first signal, characterized by: A) switch means: responsive to a control signal; and being operably coupled between the signal receiving means and the digital signal processing means; for selectively allowing the broadcast signal as received by the signal receiving means to be provided to the digital signal processing means;
B) low power signal processing means: operably coupled to the signal receiving means; and requiring a second amount of power, said second amount of power being less than the first amount of power; for detecting a broadcast signal of interest and providing a control signal to the switch means in response thereto.
2) A radio having signal receiving means for receiving broadcast signals, and digital signal processing means that requires a first amount of power to operate for converting the received broadcast signal into a first signal, characterized by low power signal processing means: operably coupled to the signal receiving means; and requiring a second amount of power, said second amount of power being less than the first amount of power; for detecting a broadcast signal of interest and providing a control signal to the digital signal processing means to substantially control power consumption of the digital signal processing means.
EP19900905882 1989-03-20 1990-03-13 Dsp based radio with diminished power requirements Withdrawn EP0463104A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US32560389A 1989-03-20 1989-03-20
US325603 1989-03-20

Publications (2)

Publication Number Publication Date
EP0463104A1 EP0463104A1 (en) 1992-01-02
EP0463104A4 true EP0463104A4 (en) 1993-01-13

Family

ID=23268578

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900905882 Withdrawn EP0463104A4 (en) 1989-03-20 1990-03-13 Dsp based radio with diminished power requirements

Country Status (5)

Country Link
EP (1) EP0463104A4 (en)
JP (1) JPH04504340A (en)
KR (1) KR950000050B1 (en)
CA (1) CA2045519C (en)
WO (1) WO1990011652A1 (en)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE464437B (en) * 1989-08-25 1991-04-22 Ericsson Telefon Ab L M METHOD OF A MOGIL RADIO RECEIVER TO REDUCE THE POWER RECEIVER'S REQUIREMENT
US5790946A (en) 1993-07-15 1998-08-04 Rotzoll; Robert R. Wake up device for a communications system
FI97765C (en) * 1993-11-26 1997-02-10 Nokia Mobile Phones Ltd A method and a switching arrangement for processing paging messages in a mobile station
CA2135856A1 (en) * 1993-12-10 1995-06-11 Steven Peter Allen Low power, addressable data communication device and method
US7092369B2 (en) 1995-11-17 2006-08-15 Symbol Technologies, Inc. Communications network with wireless gateways for mobile terminal access
JP2852245B2 (en) * 1996-06-18 1999-01-27 静岡日本電気株式会社 Radio selective call receiver
DE69823162T2 (en) * 1998-02-26 2004-08-26 Motorola Semiconducteurs S.A. Energy saving arrangement for an electronic portable device
CN1188953C (en) * 1998-09-28 2005-02-09 索尼电脑娱乐公司 Method and apparatus for transceiving, receiving as well as transmitting
US6278403B1 (en) 1999-09-17 2001-08-21 Sirf Technology, Inc. Autonomous hardwired tracking loop coprocessor for GPS and WAAS receiver
US6389291B1 (en) 2000-08-14 2002-05-14 Sirf Technology Multi-mode global positioning system for use with wireless networks
US6462708B1 (en) 2001-04-05 2002-10-08 Sirf Technology, Inc. GPS-based positioning system for mobile GPS terminals
US6427120B1 (en) 2000-08-14 2002-07-30 Sirf Technology, Inc. Information transfer in a multi-mode global positioning system used with wireless networks
US6671620B1 (en) 2000-05-18 2003-12-30 Sirf Technology, Inc. Method and apparatus for determining global position using almanac information
ATE507486T1 (en) 2000-08-24 2011-05-15 Sirf Tech Inc DEVICE FOR REDUCING AUTOCORRELATION AND CROSS-CORRELATION IN WEAK CDMA SIGNALS
US7047023B1 (en) 2000-12-01 2006-05-16 Sirf Technology, Inc. GPS RF front end IC with frequency plan for improved integrability
US7747236B1 (en) 2000-12-11 2010-06-29 Sirf Technology, Inc. Method and apparatus for estimating local oscillator frequency for GPS receivers
US7113552B1 (en) 2000-12-21 2006-09-26 Sirf Technology, Inc. Phase sampling techniques using amplitude bits for digital receivers
US6680703B1 (en) 2001-02-16 2004-01-20 Sirf Technology, Inc. Method and apparatus for optimally tuning a circularly polarized patch antenna after installation
US6703971B2 (en) 2001-02-21 2004-03-09 Sirf Technologies, Inc. Mode determination for mobile GPS terminals
US7076256B1 (en) 2001-04-16 2006-07-11 Sirf Technology, Inc. Method and apparatus for transmitting position data using control channels in wireless networks
US7877104B2 (en) 2001-05-21 2011-01-25 Sirf Technology Inc. Method for synchronizing a radio network using end user radio terminals
US7925210B2 (en) 2001-05-21 2011-04-12 Sirf Technology, Inc. Synchronizing a radio network with end user radio terminals
JP4658050B2 (en) 2003-09-02 2011-03-23 サーフ テクノロジー インコーポレイテッド Signal processing system for satellite positioning signals
US8532718B2 (en) * 2005-10-06 2013-09-10 Broadcom Corporation Mobile communication device with low power signal detector
CN100525231C (en) * 2006-09-06 2009-08-05 ***通信集团公司 Energy-saving information household appliance network and energy-saving control method
US8442475B2 (en) * 2010-11-15 2013-05-14 Qualcomm Incorporated Power conservation in wireless access terminals using integrated proxy function

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3753122A (en) * 1971-03-31 1973-08-14 K Shackleford Frequency responsive radio actuator for automatically connecting the receiver portion and the audio portion
WO1988006830A1 (en) * 1987-03-04 1988-09-07 Michael Victor Rodrigues Cellular telephone apparatus and cellular communication system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4419765A (en) * 1979-10-12 1983-12-06 Keith H. Wycoff Signal absence detector
JPS61240719A (en) * 1985-04-18 1986-10-27 Nec Corp Receiver

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3753122A (en) * 1971-03-31 1973-08-14 K Shackleford Frequency responsive radio actuator for automatically connecting the receiver portion and the audio portion
WO1988006830A1 (en) * 1987-03-04 1988-09-07 Michael Victor Rodrigues Cellular telephone apparatus and cellular communication system

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 11, no. 88 (E-2535)18 March 1987 & JP-A-61 240 719 ( NEC CORP ) *
See also references of WO9011652A1 *

Also Published As

Publication number Publication date
WO1990011652A1 (en) 1990-10-04
EP0463104A1 (en) 1992-01-02
CA2045519A1 (en) 1990-09-21
JPH04504340A (en) 1992-07-30
CA2045519C (en) 1994-11-08
KR920700497A (en) 1992-02-19
KR950000050B1 (en) 1995-01-07

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