FI98584B - Förfarande och anordning för att behandla en mottagen signal - Google Patents

Förfarande och anordning för att behandla en mottagen signal Download PDF

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Publication number
FI98584B
FI98584B FI952186A FI952186A FI98584B FI 98584 B FI98584 B FI 98584B FI 952186 A FI952186 A FI 952186A FI 952186 A FI952186 A FI 952186A FI 98584 B FI98584 B FI 98584B
Authority
FI
Finland
Prior art keywords
sample
frequency
received signal
filter
circuit arrangement
Prior art date
Application number
FI952186A
Other languages
English (en)
Finnish (fi)
Other versions
FI98584C (sv
FI952186A0 (sv
FI952186A (sv
Inventor
Jukka Henriksson
Vesa Vaelimaeki
Timo I Laakso
Original Assignee
Nokia Technology Gmbh
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 Nokia Technology Gmbh filed Critical Nokia Technology Gmbh
Priority to FI952186A priority Critical patent/FI98584C/sv
Publication of FI952186A0 publication Critical patent/FI952186A0/sv
Priority to EP96106338A priority patent/EP0741472A3/en
Priority to US08/642,339 priority patent/US5812608A/en
Publication of FI952186A publication Critical patent/FI952186A/sv
Application granted granted Critical
Publication of FI98584B publication Critical patent/FI98584B/sv
Publication of FI98584C publication Critical patent/FI98584C/sv

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
    • H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
    • 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
    • H03H17/028—Polynomial filters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
    • H04L27/2271—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals
    • H04L27/2273—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals associated with quadrature demodulation, e.g. Costas loop
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0016—Arrangements for synchronising receiver with transmitter correction of synchronization errors
    • H04L7/002—Arrangements for synchronising receiver with transmitter correction of synchronization errors correction by interpolation
    • H04L7/0029—Arrangements for synchronising receiver with transmitter correction of synchronization errors correction by interpolation interpolation of received data signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0024—Carrier regulation at the receiver end
    • H04L2027/0026—Correction of carrier offset
    • H04L2027/0028—Correction of carrier offset at passband only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0044—Control loops for carrier regulation
    • H04L2027/0053—Closed loops
    • H04L2027/0057—Closed loops quadrature phase
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0054—Detection of the synchronisation error by features other than the received signal transition
    • H04L7/0062—Detection of the synchronisation error by features other than the received signal transition detection of error based on data decision error, e.g. Mueller type detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
    • H04L7/027—Speed or phase control by the received code signals, the signals containing no special synchronisation information extracting the synchronising or clock signal from the received signal spectrum, e.g. by using a resonant or bandpass circuit
    • H04L7/0274—Speed or phase control by the received code signals, the signals containing no special synchronisation information extracting the synchronising or clock signal from the received signal spectrum, e.g. by using a resonant or bandpass circuit with Costas loop

Claims (14)

1. Förfarande för behandling av en mottagen signal inom ett system med variabel symbolhastighet, varvid digitala sampel tas pä den mottagna signalen, de digitala samplen filtreras och beslut tas pä basen av de filtrerade samplen, kännetecknat av 5 att - samplingen utförs pä en frekvens (ff) som är högre än den största symbolfrekven-sen hos en signal som skall mottas, - före filtreringen bildas av den sälunda erhällna första sampelsekvensen en andra sampelsekvens, vars sampelfrekvens är väsentligt lika hög som den mottagna signa- 10 lens symbolfrekvens (f,) eller en heltalsmultipel av denna och - för att bilda en andra sampelsekvens pä den första sampelsekvensen utförs Lag-range-interpolering.
2. Förfarande enligt patentkrav 1, kännetecknat av att Lagrange-interpoleringen 15 utförs väsentligt i enlighet med Farrow-uppbyggnad.
3. Förfarande enligt patentkrav 1 eller 2, kännetecknat av att Lagrange-interpole-ringens gradtal är ett litet udda heltal. 20
4. Förfarande enligt nägot av föregäende patentkrav, kännetecknat av att för att bilda sampelvärdet för respektive andra sampelsekvens bestäms värdet (D) för för-dröjningen av respektive sampel.
5. Förfarande enligt nägot av föregäende patentkrav, kännetecknat av att av den 25 första sampelsekvensen bildas en tredje sampelsekvens, vars sampelfrekvens är väsentligt sampelfrekvensen för den andra sampelsekvensen delad med ett helt tai (M).
6. Förfarande enligt nägot av föregäende patentkrav, kännetecknat av att sampel-30 frekvensen för den första sampelsekvensen ändras sä att sampelfrekvensen för den sampelsekvens som tillförs filtret är lika stor som symbolfrekvensen hos den mot-tagna signalen eller en heltalsmultipel av denna.
7. Förfarande enligt nägot av föregäende patentkrav, kännetecknat av att den mot- 35 tagna signalen mod ui era ts med kvadraturiskt förfarande, varvid nämnda omvandling av sampelsekvensens sampelfrekvens utförs skilt för sampelsekvensema i I- och Q-grenen. 15 98584
8. Kretsarrangemang för behandling av en mottagen signal inom ett system med variabel symbolhastighet, omfattande, successivt kopplade, en samplingskrets (5) för att bilda digitala sampel, ett filter (8) och en beslutskrets (9) för att bilda ett be-slutsvärde ρέ basen av samplen, kännetecknat av att 5. samplingskretsens (5) sampelfrekvens (ff) är högre än den högsta symbolfrekven- sen hos signalen som skall mottas, * kretsarrangemanget omfattar ett brottfördröjningsfilter (6) för att omvandla sam-pelfrekvensen hos den samplade signalen sk att den blir väsentligt lika stor som den mottagna signalens symbolfrekvens eller en heltalsmultipel av denna och 10 - nämnda brottfördröjningsfilter (6) är en Lagrange-interpolator.
9. Kretsarrangemang enligt patentkrav 8, kännetecknat av att efter brottfördröj-ningsfiltret (6) och före beslutskretsen (9) har kretsen en sampelfrekvensomvandlare (7) för att dela sampelfrekvensen med ett helt tai (M). 15
10. Kretsarrangemang enligt patentkrav 8 eller 9, kannetecknat av att nämnda Lag· range-interpolator har en Farrow-uppbyggnad, varvid styrsignalen är väsentligt pro-portionerlig mot sampelfördröjningcn (D).
11. Kretsarrangemang enligt patentkrav 10, kännetecknat av att nämnda Lagrange- interpolator har en omvandlad Farrow-uppbyggnad, i vilken antalet överföringsre-gister och multiplikatorer minimerats. « 1 · Γ:
12. Kretsarrangemang enligt nägot av patentkraven 8-11, kännetecknat av att Lag- '·1·1 25 range-interpolatoms gradtal är ett litet udda heltal. • · • · *·.1·:
13. Användning av förfarandet eller kretsarrangemanget enligt nägot av föregäende • · : patentkrav i mottagaren inom ett digitalt televisionssystem. • ·· • · · • e · • · · • · · ··· m·· t · · • · · • · · « · • · ·· · • • m m • · • · · • · · • · · · m m · • ·
FI952186A 1995-05-05 1995-05-05 Förfarande och anordning för att behandla en mottagen signal FI98584C (sv)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FI952186A FI98584C (sv) 1995-05-05 1995-05-05 Förfarande och anordning för att behandla en mottagen signal
EP96106338A EP0741472A3 (en) 1995-05-05 1996-04-23 Method and circuit arrangement for processing variable symbol rates
US08/642,339 US5812608A (en) 1995-05-05 1996-05-03 Method and circuit arrangement for processing received signal

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI952186A FI98584C (sv) 1995-05-05 1995-05-05 Förfarande och anordning för att behandla en mottagen signal
FI952186 1995-05-05

Publications (4)

Publication Number Publication Date
FI952186A0 FI952186A0 (sv) 1995-05-05
FI952186A FI952186A (sv) 1996-11-06
FI98584B true FI98584B (sv) 1997-03-27
FI98584C FI98584C (sv) 1997-07-10

Family

ID=8543361

Family Applications (1)

Application Number Title Priority Date Filing Date
FI952186A FI98584C (sv) 1995-05-05 1995-05-05 Förfarande och anordning för att behandla en mottagen signal

Country Status (3)

Country Link
US (1) US5812608A (sv)
EP (1) EP0741472A3 (sv)
FI (1) FI98584C (sv)

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Also Published As

Publication number Publication date
FI98584C (sv) 1997-07-10
US5812608A (en) 1998-09-22
EP0741472A3 (en) 2000-06-07
EP0741472A2 (en) 1996-11-06
FI952186A0 (sv) 1995-05-05
FI952186A (sv) 1996-11-06

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