NO894274L - FILTERBANK FOR FREQUENCY MULTIPLEXING respectively. FREQUENCY DEMULIPLE OF CHANNEL SIGNALS. - Google Patents

FILTERBANK FOR FREQUENCY MULTIPLEXING respectively. FREQUENCY DEMULIPLE OF CHANNEL SIGNALS.

Info

Publication number
NO894274L
NO894274L NO89894274A NO894274A NO894274L NO 894274 L NO894274 L NO 894274L NO 89894274 A NO89894274 A NO 89894274A NO 894274 A NO894274 A NO 894274A NO 894274 L NO894274 L NO 894274L
Authority
NO
Norway
Prior art keywords
filter
frequency
filters
cascade
channel signals
Prior art date
Application number
NO89894274A
Other languages
Norwegian (no)
Other versions
NO894274D0 (en
Inventor
Heinz Goeckler
Original Assignee
Ant Nachrichtentech
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
Priority claimed from DE19883837841 external-priority patent/DE3837841C1/en
Application filed by Ant Nachrichtentech filed Critical Ant Nachrichtentech
Publication of NO894274D0 publication Critical patent/NO894274D0/en
Publication of NO894274L publication Critical patent/NO894274L/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H17/00—Networks using digital techniques
    • H03H17/02—Frequency selective networks
    • H03H17/0248—Filters characterised by a particular frequency response or filtering method
    • H03H17/0264—Filter sets with mutual related characteristics
    • H03H17/0273—Polyphase filters
    • H03H17/0275—Polyphase filters comprising non-recursive filters
    • H03H17/0276—Polyphase filters comprising non-recursive filters having two phases
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H17/00—Networks using digital techniques
    • H03H17/02—Frequency selective networks
    • H03H17/0248—Filters characterised by a particular frequency response or filtering method
    • H03H17/0264—Filter sets with mutual related characteristics
    • H03H17/0266—Filter banks
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H17/00—Networks using digital techniques
    • H03H17/02—Frequency selective networks
    • H03H17/06—Non-recursive filters
    • H03H17/0621—Non-recursive filters with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing
    • H03H17/0635—Non-recursive filters with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing characterized by the ratio between the input-sampling and output-delivery frequencies
    • H03H17/065—Non-recursive filters with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing characterized by the ratio between the input-sampling and output-delivery frequencies the ratio being integer
    • H03H17/0657—Non-recursive filters with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing characterized by the ratio between the input-sampling and output-delivery frequencies the ratio being integer where the output-delivery frequency is higher than the input sampling frequency, i.e. interpolation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H17/00—Networks using digital techniques
    • H03H17/02—Frequency selective networks
    • H03H17/06—Non-recursive filters
    • H03H17/0621—Non-recursive filters with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing
    • H03H17/0635—Non-recursive filters with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing characterized by the ratio between the input-sampling and output-delivery frequencies
    • H03H17/065—Non-recursive filters with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing characterized by the ratio between the input-sampling and output-delivery frequencies the ratio being integer
    • H03H17/0664—Non-recursive filters with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing characterized by the ratio between the input-sampling and output-delivery frequencies the ratio being integer where the output-delivery frequency is lower than the input sampling frequency, i.e. decimation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J4/00—Combined time-division and frequency-division multiplex systems
    • H04J4/005—Transmultiplexing
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H2218/00—Indexing scheme relating to details of digital filters
    • H03H2218/04—In-phase and quadrature [I/Q] signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Mathematical Physics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Radio Relay Systems (AREA)
  • Complex Calculations (AREA)

Abstract

Filterbank for frekvensmultiplek- sing hhv. frekvensdernultipleksing av kanalsignaler med transversalfiltre, med redusert hhv. øket samplingstakt, idet de L filtre er realisert ved hjelp av en kaskade, og idet det mellom de i enkelte filterkaskader er innkoplet en kompleks multipliserer, og som er i kjennetegnet ved at multiplisereren er sammenfattet med filteret i det forangående hhv. etterfølgende kaskade- I trinn. Anvendelsen av sådanne filter- : banker skjer hovedsakelig i transmulti- i pleksere for omforming av FDM til TDM hhv. omvendt, hovedsakelig innen satel-' litteknikken. Formålet med oppfinnelsen er å redusere den nødvendige regne- ytelse. Ved hjelp av sammenfatningen i av den komplekse multipliserer med i det tilgrensende filter oppstår riktig- nok et tidsvariant filter, men filtrene i de andre kaskadetrinn er som for tidsinvariante og inneholder reelle koeffisienter. Totalt sett fremkommer en mindre regneytelse, idet antallet av koeffisienter som skal lagres, øker bare i uvesentlig grad.Filter bank for frequency multiplication, respectively. frequency zero multiplexing of channel signals with transversal filters, with reduced and lower frequencies, respectively. increased sampling rate, the L filters being realized by means of a cascade, and a complex multiplier between those in some filter cascades, which is characterized by the multiplier being combined with the filter in the foregoing respectively. subsequent cascade- In step. The use of such filter banks is mainly done in transmulti- plexers for converting FDM to TDM respectively. conversely, mainly in satellite technology. The object of the invention is to reduce the necessary calculation performance. Using the summary of the complex multiplier with the adjacent filter, a time-varying filter is correctly generated, but the filters in the other cascade stages are as for time-invariant and contain real coefficients. Overall, a smaller computational performance appears, as the number of coefficients to be stored only increases to a significant extent.

NO89894274A 1988-11-08 1989-10-26 FILTERBANK FOR FREQUENCY MULTIPLEXING respectively. FREQUENCY DEMULIPLE OF CHANNEL SIGNALS. NO894274L (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19883837841 DE3837841C1 (en) 1988-10-22 1988-11-08 Filter bank for the frequency-division multiplexing or frequency-division demultiplexing of channel signals

Publications (2)

Publication Number Publication Date
NO894274D0 NO894274D0 (en) 1989-10-26
NO894274L true NO894274L (en) 1990-05-09

Family

ID=6366709

Family Applications (1)

Application Number Title Priority Date Filing Date
NO89894274A NO894274L (en) 1988-11-08 1989-10-26 FILTERBANK FOR FREQUENCY MULTIPLEXING respectively. FREQUENCY DEMULIPLE OF CHANNEL SIGNALS.

Country Status (2)

Country Link
EP (1) EP0367932B1 (en)
NO (1) NO894274L (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2759514B1 (en) 1997-02-10 1999-03-05 Alsthom Cge Alcatel DIGITAL FILTERING, DECIMATION AND TRANSPOSITION DEVICE AND METHOD IN DISTRIBUTED BASE BAND, AND CORRESPONDING DIGITAL DEMODULATOR
FR2815211A1 (en) * 2000-10-11 2002-04-12 Satellite Terminal Access Digital numerical word filtering mechanism having transfer function with P coefficients cq with P whole number having period T such that cq equals cq plus T when q is smaller than P minus T and larger than one.
US6961395B2 (en) * 2001-11-16 2005-11-01 Nortel Networks Limited Time variant filter implementation

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4412325A (en) * 1981-07-13 1983-10-25 Telettra- Telefonia Elettronica E Radio S.P.A. Equipment for single band multiplexing through digital processing
DE8706928U1 (en) * 1987-05-14 1987-08-06 ANT Nachrichtentechnik GmbH, 7150 Backnang Filter bank

Also Published As

Publication number Publication date
EP0367932A2 (en) 1990-05-16
EP0367932A3 (en) 1991-10-09
EP0367932B1 (en) 1994-08-24
NO894274D0 (en) 1989-10-26

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