公开(公告)号：EP2267907B1

公开(公告)日：2017-04-12

申请号：EP10165998.5

申请日：2010-06-15

Applicant: Electronics and Telecommunications Research Institute

Inventor： Han, Seon-Ho ,  Yu, Hyun Kyu

IPC: H04B1/00

CPC classification number: H04B1/0025 ,  H04B1/001

公开(公告)号：EP2351232B1

公开(公告)日：2017-01-11

申请号：EP09760000.1

申请日：2009-11-12

Applicant: NXP B.V.

Inventor： DORIS, Konstantinos ,  JANSSEN, Erwin

IPC: H04B1/00 ,  H03H17/02 ,  H04N5/44

CPC classification number: H04B1/001 ,  H03H17/06 ,  H03H2218/08 ,  H04B1/0025

公开(公告)号：EP2847867A4

公开(公告)日：2016-02-10

申请号：EP12875989

申请日：2012-05-03

Applicant: ERICSSON TELEFON AB L M

Inventor： JOHANSSON BERNT ,  BERGLUND BO

IPC: H04B1/04 ,  H04B1/00 ,  H04L27/36

CPC classification number: H04B1/04 ,  H03F1/3241 ,  H03F1/34 ,  H03F3/24 ,  H04B1/0003 ,  H04B1/001 ,  H04B1/0025 ,  H04B1/0053 ,  H04B1/0483 ,  H04B2001/0425 ,  H04B2001/0433 ,  H04B2001/0491

Abstract: A radio communication transmitter apparatus 20 is operable to transmit multiple radio frequency bands in a telecommunication system. The apparatus comprises a plurality of digital transmitter chains 211 to 21N, wherein each digital transmitter chain is coupled to receive a digital representation 271 to 27N of a respective base band signal for processing by a respective digital transmitter chain. Each digital transmitter chain 211 to 21N comprises a digital transmitter 251 to 25N that is adapted to convert a respective digital base band signal directly into a digital representation of a radio frequency signal 231 to 23N. A digital combining unit 25 is coupled to receive the output of each digital transmitter chain 211 to 21N, and adapted to combine the digital representation of a radio frequency signal 231 to 23N received from each digital transmitter chain 211 to 21N into a digital representation of a radio frequency signal 26 comprising multiple radio frequency bands. A digital to analogue converter 27 is coupled to receive the digital representation of a radio frequency signal 26 comprising multiple radio frequency bands, and adapted to convert the digital representation of a radio frequency signal 26 into an analogue radio frequency signal 28 comprising multiple radio frequency bands.

公开(公告)号：EP1714395A1

公开(公告)日：2006-10-25

申请号：EP05710286.5

申请日：2005-02-09

Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

Inventor： MORI, Kenichi ,  TAKAI, Hitoshi

IPC: H04B1/28

CPC classification number: H04B1/0017 ,  H04B1/001 ,  H04B1/0025 ,  H04B1/28

Abstract: A base station 2 demodulates a wireless signal after downconverting the signal to a low-frequency signal whose center frequency is fi [Hz] and oversampling the signal. A mobile station 3 demodulates a wireless signal after downconverting the signal to a low-frequency signal whose center frequency is fd [Hz] and undersampling the signal. The same sampling frequency fs [Hz] is used in the base station 2 and in the mobile station 3. The sampling frequency fs [Hz] is set to a value that is an even-number multiple of a wireless symbol transmission rate such that oversampling is done in the base station 2 and undersampling is done in the mobile station 3. The center frequency fi [Hz] is 1/2 to 1 times a frequency corresponding to the bandwidth and is 1/2N (N is a natural number) times the sampling frequency fs [Hz].

公开(公告)号：EP1396088A2

公开(公告)日：2004-03-10

申请号：EP02730609.1

申请日：2002-05-22

Applicant: Koninklijke Philips Electronics N.V.

Inventor： FAN, Yiping

IPC: H04B1/28 ,  H03D3/00 ,  H04L27/233

CPC classification number: H04B1/0014 ,  H03D3/007 ,  H04B1/0003 ,  H04B1/0025 ,  H04B1/0039 ,  H04B1/28 ,  H04L27/3881 ,  H04L2027/0016 ,  H04L2027/0024

Abstract: An apparatus and method for the two-dimensional direct intermediate frequency sampling of a received signal. A receiver is equipped with a circuit for converting a received radio frequency signal to an intermediate frequency signal. The converted intermediate frequency signal is sampled by a pair of lowpass analog-to-digital converters. The sampling scheme involves quadrature envelope sampling of the intermediate frequency signal. The sampling scheme further involves sampling the Q-channel signal at a quarter of the intermediate frequency carrier period after the I-channel signal is sampled.

公开(公告)号：EP1210773A2

公开(公告)日：2002-06-05

申请号：EP00958182.8

申请日：2000-07-28

Applicant: DaimlerChrysler AG

Inventor： LUY, Johann-Friedrich

IPC: H03M1/34

CPC classification number: H04B1/0025 ,  H01P7/065 ,  H03M1/34 ,  H04B1/00 ,  H04B1/0003 ,  H04B1/16

Abstract: The invention relates to an analog-to-digital converter for a signal in the gigahertz range, to a millimetric wave receiver comprising the inventive analog-to-digital converter for a signal in the gigahertz range and to a bandpass filter for millimetric waves. The inventive analog-to-digital converter comprises a signal input for receiving an analog signal in the gigahertz range and a tridimensional filter to which the input analog signal is transmitted and which is characterised by a mean frequency f0 and a bandwidth B. Said analog-to-digital converter also comprises a sample-and-hold stage which oversamples the analog signal in a band restricted manner, whereby the Nyquist condition is verified, and a comparator for generating the digital signal, which follows the sample-and-hold stage and transmits the digital signal to a signal output. The inventive analog-to-digital converter allows for the conversion of signals in the gigahertz range into signals of a frequency range which can be directly submitted to a digital signal processing. Thus, the invention provides for a highly cost effective converter characterised by a low sensitivity to interference.

公开(公告)号：EP1183667A1

公开(公告)日：2002-03-06

申请号：EP00936065.2

申请日：2000-05-17

Applicant: CELLNET DATA SYSTEMS, INC.

Inventor： SUMMERS, Andrew Gordon ,  IRVING, Clive Russell ,  LUXFORD, Gregory Vincent

IPC: G08C17/00 ,  G08C19/16 ,  H04J11/00 ,  H04B1/06 ,  H03D3/18 ,  H03K9/00

CPC classification number: H04B1/0025 ,  H03D7/163 ,  H04B1/28 ,  H04L7/04

Abstract: A receiver (100) which is capable of receiving in parallel data transmitted at arbitrary frequencies within a radio channel includes: a radio frequency (RF) front-end to convert an RF signal to a digitized signal; a Fast Fourier Transform (FFT) generator (130) coupled to the RF front-end to separate the digitized signal into a plurality of sub-channels; a band of phase locked loops (PLLs)(132) coupled to the FFT generator (130), each PLL operating on a sub-channel with a sub-channel center; and a flag detector (131) coupled to the bank of PLLs (132) to detect variations from the sub-channel center and to recover the usage data transmitted from the end-point.

公开(公告)号：EP2847867B1

公开(公告)日：2018-10-17

申请号：EP12875989.1

申请日：2012-05-03

Applicant: Telefonaktiebolaget LM Ericsson (publ)

Inventor： JOHANSSON, Bernt ,  BERGLUND, Bo

IPC: H04B1/04 ,  H04L27/36 ,  H04B1/00 ,  H03F1/32 ,  H03F1/34 ,  H03F3/24

CPC classification number: H04B1/04 ,  H03F1/3241 ,  H03F1/34 ,  H03F3/24 ,  H04B1/0003 ,  H04B1/001 ,  H04B1/0025 ,  H04B1/0053 ,  H04B1/0483 ,  H04B2001/0425 ,  H04B2001/0433 ,  H04B2001/0491

Abstract: A radio communication transmitter apparatus 20 is operable to transmit multiple radio frequency bands in a telecommunication system. The apparatus comprises a plurality of digital transmitter chains 211 to 21N, wherein each digital transmitter chain is coupled to receive a digital representation 271 to 27N of a respective base band signal for processing by a respective digital transmitter chain. Each digital transmitter chain 211 to 21N comprises a digital transmitter 251 to 25N that is adapted to convert a respective digital base band signal directly into a digital representation of a radio frequency signal 231 to 23N. A digital combining unit 25 is coupled to receive the output of each digital transmitter chain 211 to 21N, and adapted to combine the digital representation of a radio frequency signal 231 to 23N received from each digital transmitter chain 211 to 21N into a digital representation of a radio frequency signal 26 comprising multiple radio frequency bands. A digital to analogue converter 27 is coupled to receive the digital representation of a radio frequency signal 26 comprising multiple radio frequency bands, and adapted to convert the digital representation of a radio frequency signal 26 into an analogue radio frequency signal 28 comprising multiple radio frequency bands.

公开(公告)号：EP2847867A1

公开(公告)日：2015-03-18

申请号：EP12875989.1

申请日：2012-05-03

Applicant: Telefonaktiebolaget LM Ericsson (PUBL)

Inventor： JOHANSSON, Bernt ,  BERGLUND, Bo

IPC: H04B1/04 ,  H04L27/36

CPC classification number: H04B1/04 ,  H03F1/3241 ,  H03F1/34 ,  H03F3/24 ,  H04B1/0003 ,  H04B1/001 ,  H04B1/0025 ,  H04B1/0053 ,  H04B1/0483 ,  H04B2001/0425 ,  H04B2001/0433 ,  H04B2001/0491

Abstract: A radio communication transmitter apparatus 20 is operable to transmit multiple radio frequency bands in a telecommunication system. The apparatus comprises a plurality of digital transmitter chains 211 to 21N, wherein each digital transmitter chain is coupled to receive a digital representation 271 to 27N of a respective base band signal for processing by a respective digital transmitter chain. Each digital transmitter chain 211 to 21N comprises a digital transmitter 251 to 25N that is adapted to convert a respective digital base band signal directly into a digital representation of a radio frequency signal 231 to 23N. A digital combining unit 25 is coupled to receive the output of each digital transmitter chain 211 to 21N, and adapted to combine the digital representation of a radio frequency signal 231 to 23N received from each digital transmitter chain 211 to 21N into a digital representation of a radio frequency signal 26 comprising multiple radio frequency bands. A digital to analogue converter 27 is coupled to receive the digital representation of a radio frequency signal 26 comprising multiple radio frequency bands, and adapted to convert the digital representation of a radio frequency signal 26 into an analogue radio frequency signal 28 comprising multiple radio frequency bands.

公开(公告)号：EP2766997A1

公开(公告)日：2014-08-20

申请号：EP12787099.6

申请日：2012-10-01

Applicant: Optis Cellular Technology, LLC

Inventor： LAPORTE, Pierre-Andre

IPC: H04B1/00

CPC classification number: H04B1/0025

Abstract: A method and apparatus for digital down conversion and demodulation of a radio frequency (RF) signal are disclosed. A sampling frequency for sampling the RF signal is chosen, based on a bandwidth and a safety margin, so that a bandwidth of the sampled signal falls substantially within a predetermined frequency zone. The sampled signal may be digitally demodulated at a demodulation frequency selected to be substantially equal to a baseband alias of a carrier frequency of the signal.