公开(公告)号：EP1471653A4

公开(公告)日：2011-06-22

申请号：EP03734861

申请日：2003-01-28

申请人： PANASONIC CORP

发明人： MATSUMOTO HIDENORI ,  OBARA TOSHIO

IPC分类号： H04B1/30 ,  H03D3/00 ,  H03G3/30 ,  H04B1/16 ,  H04B1/707 ,  H04J13/00 ,  H04L25/06 ,  H04L27/14 ,  H04L27/22 ,  H04L27/38

CPC分类号： H04L25/06 ,  H03G3/3068 ,  H04B1/30 ,  H04B2201/70707 ,  H04L27/3809

摘要： A determining section ( 18 ) and gain variation amount detecting section ( 9 ) detect a period having a possibility of a DC-component offset in an internal circuit of a direct conversion receiver increasing beyond an allowable value due to AGC operation, and during the period, a cut-off frequency of each of high-pass filters ( 12 a to 12 d) is set at a frequency higher than that in general operation, thereby rapidly converging transient responses of signals passed through the high-pass filters, while controlling precisely operation timings of reception power measuring section ( 16 ), gain calculating section ( 22 ), gain control section ( 23 ) and circuit power supply control section ( 24 ) composing an AGC loop, whereby the DC offset is prevented from increasing and stable circuit operation is assured. It is thereby possible to achieve further reductions in size and power consumption of a CDMA receiver using the direct conversion receiver.

公开(公告)号：EP1233587B1

公开(公告)日：2010-12-15

申请号：EP00966481.4

申请日：2000-10-13

申请人： MITSUBISHI DENKI KABUSHIKI KAISHA

发明人： MIZUOCHI, Takashi, Mitsubishi Denki Kabushiki K.

IPC分类号： H04L25/49 ,  H04B10/04 ,  H04B10/06 ,  G02F2/00 ,  H04B10/155

CPC分类号： H04L25/4917 ,  H04B10/505 ,  H04B10/5055 ,  H04B10/508 ,  H04B10/5162 ,  H04B10/541 ,  H04B10/6932 ,  H04L25/06

摘要： Binary information is converted to an RZ code and then to a multi-value code, and the coded signal is used for light modulation.

公开(公告)号：EP2222045A1

公开(公告)日：2010-08-25

申请号：EP08859315.7

申请日：2008-10-28

申请人： NEC Corporation

发明人： KAWAI, Masahiro

IPC分类号： H04L27/38

CPC分类号： H04L25/06 ,  H04L27/368

摘要： At a transmitting side, during carrier leak adjustment, quadrature modulation means uses a carrier wave having a frequency different from that at a receiving side to quadrature-modulate an outgoing signal. Feedback means feeds a modulated wave resulting from the quadrature modulation back to the receiving side. At the receiving side, quadrature demodulation means quadrature-demodulates the fed back modulated wave. Phase locking means locks the phase of the signal resulting from the quadrature demodulation to match the phase to the phase at the transmitting side. Offset detection means time-averages the phase-locked signal to detect a direct-current offset. At the transmitting side, based on the value of the direct-current offset detected at the receiving side, offset adjustment means corrects a direct-current offset of the outgoing signal to be quadrature-modulated.

摘要翻译： 在发送侧，在载波泄漏调整期间，正交调制装置使用与接收侧不同的频率的载波来对输出信号进行正交调制。 反馈意味着将由正交调制产生的调制波反馈回接收端。 在接收侧，正交解调装置正交解调反馈调制波。 相位锁定装置锁定由正交解调产生的信号的相位以使发射侧的相位与相位匹配。 偏移检测意味着对锁相信号进行时间平均以检测直流偏移。 在发送侧，基于在接收侧检测到的直流偏移的值，偏移调整装置校正要进行正交调制的输出信号的直流偏移。

公开(公告)号：EP1916773A4

公开(公告)日：2010-01-27

申请号：EP05772581

申请日：2005-08-19

申请人： FUJITSU LTD

发明人： SHAKO HIDEHARU ,  FUNYU YASUHITO ,  OHBA TAKESHI

IPC分类号： H03M1/12 ,  H04B1/04 ,  H04L25/06 ,  H04L27/36

CPC分类号： H04L25/061 ,  H03M1/1019 ,  H03M1/66 ,  H04B1/30 ,  H04L25/06 ,  H04L27/364

公开(公告)号：EP2043288A1

公开(公告)日：2009-04-01

申请号：EP08704351.9

申请日：2008-02-01

申请人： Panasonic Corporation

发明人： SHIRAKATA, Naganori, c/o Panasonic Corporation ,  HOSOKAWA, Shuya, c/o Panasonic Corporation ,  MIYANAGA, Kenji, c/o Panasonic Corporation ,  IMAMURA, Koji, c/o Panasonic Corporation

IPC分类号： H04J15/00 ,  H04B7/04 ,  H04J11/00

CPC分类号： H04L25/0228 ,  H04L25/06 ,  H04L27/2647

摘要： An FFT unit (170) separates a received symbol by Fourier conversion into a plurality of subcarriers, and a phase difference detection unit (193) detects a phase difference between 4 pilot carriers and data carriers adjacent to the pilot carriers (adjacent carriers). The decision unit (194) decides whether the phase differences between the pilot carriers and the adjacent carriers detected by the phase difference detection unit (193) fulfill a phase difference condition. Then, the decision unit (194) decides that the received symbol is an HTSIG if the number of phase differences that fulfill the phase difference condition is greater than or equal to a predetermined number, and decides that the received symbol is either a SIG or a DATA if the number of phase differences that fulfill the phase difference condition is less than the predetermined number.

摘要翻译： FFT单元（170）通过傅里叶变换将接收到的符号分离成多个子载波，相位差检测单元（193）检测4个导频载波和与导频载波（相邻载波）相邻的数据载波之间的相位差。 决定单元（194）判定由相位差检测单元（193）检测的导频载波与相邻载波之间的相位差是否满足相位差条件。 然后，如果满足相位差条件的相位差数大于或等于预定数量，则判定单元（194）判定接收到的符号是HTSIG，并且确定接收的符号是SIG或 DATA，如果相位差条件的相位差数量小于预定数量。

公开(公告)号：EP1924042A1

公开(公告)日：2008-05-21

申请号：EP05782310.6

申请日：2005-09-08

申请人： FUJITSU LIMITED

发明人： SUZUKI, Masayoshi

IPC分类号： H04L27/20 ,  H04L27/36

CPC分类号： H04L27/364 ,  H03F1/0205 ,  H03F1/32 ,  H03F1/3247 ,  H03F3/24 ,  H03F2200/228 ,  H03F2200/336 ,  H03F2200/375 ,  H04L25/06 ,  H04L27/20

摘要： A transmission device of the present invention comprises: an orthogonal modulator performing orthogonal modulation on a carrier wave using an input signal comprising an in-phase signal component and an orthogonal signal component, and outputs a modulation signal to be transmitted; a detection unit detecting a carrier leaking component included in the modulation signal; a DC offset value computing unit computing a DC offset value to be added to the input signal for compensating the carrier leaking component, based on the carrier leaking component; and an abnormality judgment unit judging abnormality of the orthogonal modul-ator based on the DC offset value. By monitoring the DC offset value, a failure of the orthogonal modulator or an indication thereof is detected, and transmission of an abnormal modulation signal including a distortion component is prevented. An increase of the leaking power to adjacent channels, which causes the quality deterioration in adjacent radio communication lines, can be prevented.

摘要翻译： 本发明的发送装置包括：正交调制器，使用包括同相信号分量和正交信号分量的输入信号对载波执行正交调制，并输出要发送的调制信号; 检测单元，检测包括在调制信号中的载波泄漏分量; DC偏移值计算单元，基于所述载波泄漏分量来计算要被添加到所述输入信号以补偿所述载波泄漏分量的DC偏移值; 以及异常判断单元，基于DC偏移值来判断正交调制器的异常。 通过监视DC偏移值，检测正交调制器的故障或其指示，并且防止包括失真分量的异常调制信号的传输。 可以防止导致相邻无线电通信线路质量恶化的相邻信道泄漏功率的增加。

公开(公告)号：EP1695506A1

公开(公告)日：2006-08-30

申请号：EP04807817.4

申请日：2004-12-17

申请人： NEC Corporation

发明人： CHUNG, Edwin, c/o NEC Australia Pty. Ltd. ,  BECKER, Rene c/o NEC Australia Pty. Ltd.

IPC分类号： H04L27/38

CPC分类号： H04L27/3809 ,  H04B2201/70707 ,  H04L25/06

摘要： A device (5) for determining k representative of the magnitude A of an orthogonal component of a Quadrature Amplitude Modulation (QAM) symbol, including: multi-stage binary search circuitry (21) for conducting a multi-stage binary search for the value of A between predetermined maximum and minimum values Amax and Amin, each stage producing a single bit binary output; and integer value construction circuitry (22) for constructing the integer value k by juxtaposing the binary outputs from consecutive stages of the binary search, where W = (Amax - Amin)/ n, n equals 2i and i is an integer, Amax is a maximum detectable level of the magnitude A, Amin is a minimum detectable level of the magnitude A, and W is the incremental level between consecutive values of the integer value k.

公开(公告)号：EP1625718A1

公开(公告)日：2006-02-15

申请号：EP04785610.9

申请日：2004-04-16

申请人： INTEL CORPORATION

发明人： WEI, Fangxing ,  MAHMUD, Arif

IPC分类号： H04L25/08 ,  H04L25/06

CPC分类号： H04L25/085 ,  H04L25/06

摘要： A high-speed serial link receiver includes variable offset comparators with centrally controlled offset cancellation. The receiver includes a comparator stage to receive a high-speed differential input signal. Comparator elements of the comparator stage have first and second current sources to provide current to corresponding differential amplifier half-circuits. An offset cancellation controller provides an offset cancellation signal for setting current provided by one of the current sources to at least partially offset an output offset between the differential amplifier half-circuits. A receiver system may be comprised of a plurality of receiver units for receiving a corresponding plurality of channels over high-speed serial links. A state machine may sequentially determine an offset cancellation code for the comparator elements of the receiver units.

公开(公告)号：EP0981864B1

公开(公告)日：2004-05-19

申请号：EP99911581.9

申请日：1999-02-01

申请人： Infineon Technologies AG

发明人： HEINEN, Stefan

IPC分类号： H04B1/30 ,  H04L25/06 ,  H03D7/16

CPC分类号： H04L25/06 ,  H03D3/008 ,  H03D7/16 ,  H04B1/30

摘要： The FM receiver comprises quadrature-downwards mixing into a low IF (intermediate frequency) position, analog IF polyphase filters (24, 26) in the quadrature signal paths (I, Q) and an analog quadrature signal demodulator (27). The receiver has an alternating current coupling (C1, C2, C3, C4) in both of its quadrature signal paths. The demodulator produces a voltage at its output which is proportional to the input frequency and which is conveyed to the input of a decider circuit (33) which determines the digital signal states. The inventive circuit can be used in DECT receivers.

公开(公告)号：EP1388242A1

公开(公告)日：2004-02-11

申请号：EP02740791.5

申请日：2002-05-15

申请人： FRANCE TELECOM ,  TELEDIFFUSION DE FRANCE SA

发明人： BOUGEARD, Stéphane ,  HELARD, Jean-François ,  SIAUD, Isabelle

IPC分类号： H04L27/38 ,  H04L25/06

CPC分类号： H04L25/06 ,  H04L27/38

摘要： The invention concerns a method for demodulating a digital signal received via a transmission channel, comprising a step which consists in associating with each value received of said received signal a point of the corresponding modulation constellation, on the basis of the decision boundaries taking into account the potential effect of a phase shift on at least one of said points of the modulation constellation and of the potential effect of an Gaussian additive noise applied on said point, said Gaussian additive noise being represented by a generating surface associated with said point, and said phase shift by a rotation on an angular range based on symmetries defined by said modulation, so as to define a surface swept by said generating zone, said boundary being selected so that said swept surface belongs essentially to the region of decision associated with the corresponding point of the modulation constellation, plotted on the basis of at least one phase and/or amplitude characteristic of said modulation, so as to associate with each of said points of the constellation a portion of a reception space, called corresponding region of decision.