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1. WO1999033233 - METHOD AND APPARATUS FOR RATE CONVERSION IN A DUAL BAND GSM AND D-AMPS RADIO COMMUNICATION EQUIPMENT

Publication Number WO/1999/033233
Publication Date 01.07.1999
International Application No. PCT/SE1998/002251
International Filing Date 08.12.1998
Chapter 2 Demand Filed 18.06.1999
IPC
H04B 1/40 2006.1
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details of transmission systems, not covered by a single one of groups H04B3/-H04B13/123; Details of transmission systems not characterised by the medium used for transmission
38Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
40Circuits
H04L 25/05 2006.1
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
02Details
05Electric or magnetic storage of signals before transmitting or retransmitting for changing the transmission rate
CPC
H04B 1/0003
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details 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
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
H04B 1/0021
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details 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
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
0007wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage
0021Decimation, i.e. data rate reduction techniques
H04B 1/0092
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details 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
005adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
0067with one or more circuit blocks in common for different bands
0082with a common local oscillator for more than one band
0089using a first intermediate frequency higher that the highest of any band received
0092using a wideband front end
H04B 1/406
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
1Details 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
38Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
40Circuits
403using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
406with more than one transmission mode, e.g. analog and digital modes
H04L 25/05
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
02Details
05Electric or magnetic storage of signals before transmitting or retransmitting for changing the transmission rate
Applicants
  • TELEFONAKTIEBOLAGET LM ERICSSON (publ) [SE]/[SE]
Inventors
  • ÖSTMAN, Leif, Thomas
  • JÄRLEHOLM, Anders, Wilhelm
  • LINDQVIST, Dan, Anders
Agents
  • ERICSSON RADIO SYSTEMS AB
Priority Data
08/996,62623.12.1997US
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) METHOD AND APPARATUS FOR RATE CONVERSION IN A DUAL BAND GSM AND D-AMPS RADIO COMMUNICATION EQUIPMENT
(FR) PROCEDE ET APPAREIL DE CONVERSION DE DEBIT DANS UN EQUIPEMENT DE RADIO COMMUNICATION A DEUX BANDES GSM ET D-AMPS
Abstract
(EN) A method and apparatus in a radio telecommunications system for converting data from a first sample rate to a second sample rate such that the first and second sample rates are preferably within 10 % of each other are disclosed. An input buffer receives a plurality of data groupings at a first sample rate. A spline filter utilizes the input data along with a phase difference between input and output data to calculate a third order spline function and an output time for the input data. This information is used to convert the input data at the first sample rate to output data at a second sample rate. The output data is buffered within an output buffer until transmitted to an associated base band unit.
(FR) L'invention concerne un procédé et un appareil dans un système de radiotélécommunication permettant de convertir des données d'une première fréquence d'échantillonnage en données d'une deuxième fréquence d'échantillonnage, cette première et cette deuxième fréquences d'échantillonnage se situant, de préférence, dans les limites de 10 %. Un tampon d'entrée reçoit plusieurs groupes de données à une première fréquence d'échantillonnage. Un filtre spline utilise les données d'entrée avec une différence entre les données d'entrée et de sortie pour calculer une troisième fonction spline de commande et une heure/date de sortie pour les données d'entrée. Cette information est utilisée pour la conversion des données d'entrée d'une première fréquence d'échantillonnage en données de sortie d'une deuxième fréquence d'échantillonnage. Les données de sortie sont mises en mémoire tampon dans un registre de sortie jusqu'à ce qu'elles soient transmises à une unité bande de base associée.
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