公开(公告)号：US08270533B2

公开(公告)日：2012-09-18

申请号：US12846169

申请日：2010-07-29

Applicant: Sung-Ik Park ,  Hyoungsoo Lim ,  Heung-Mook Kim ,  Donghoon Kang ,  Wangrok Oh

Inventor： Sung-Ik Park ,  Hyoungsoo Lim ,  Heung-Mook Kim ,  Donghoon Kang ,  Wangrok Oh

IPC: H04L27/04 ,  H03D1/24

CPC classification number: H04L27/02 ,  H03C1/547 ,  H03D1/2245 ,  H03D2200/008

Abstract: A transmitter for transmitting data in a communication system includes: a serial/parallel (S/P) conversion unit configured to convert data into an I signal and a Q signal; multiplication units configured to multiply the converted I and Q signals by orthogonal sequences, respectively; conversion units configured to Hilbert-transform the I and Q signals multiplied by the orthogonal sequences; addition units configured to add the I and Q signals multiplied by the orthogonal sequences and the Hilbert-transformed Q and I signal, respectively; and an intermediate frequency (IF)/radio frequency (RF) unit configured to up-convert the added I signal and the added Q signal and transmit the converted I and Q signals.

Abstract translation: 一种用于在通信系统中传输数据的发射机包括：串行/并行（S / P）转换单元，被配置为将数据转换为I信号和Q信号; 乘法单元，分别被配置为通过正交序列来乘法转换的I和Q信号; 转换单元，被配置为希尔伯特变换乘以正交序列的I和Q信号; 附加单元，被配置为分别加上乘以正交序列的I和Q信号以及希尔伯特变换的Q和I信号; 以及中频（IF）/射频（RF）单元，被配置为对所添加的I信号和所添加的Q信号进行上变频，并发送所转换的I和Q信号。

公开(公告)号：US07529533B2

公开(公告)日：2009-05-05

申请号：US11280434

申请日：2005-11-15

Applicant: John Vincent Bellantoni

Inventor： John Vincent Bellantoni

IPC: H04B1/16

CPC classification number: H04B1/28 ,  H03D1/2245 ,  H04B1/30

Abstract: The embodiments of the present invention provide a configurable homodyne/heterodyne RF receiver including first and second mixers. The configurable homodyne/heterodyne RF receiver functions as a homodyne receiver when the first and second mixers are configured to operate in parallel, and as a heterodyne receiver when the first and second mixers are configured to operate in series. The embodiments of the present invention further provides an RFID reader employing the configurable homodyne/heterodyne RF receiver to facilitate a listen-before-talk function.

Abstract translation: 本发明的实施例提供了包括第一和第二混频器的可配置零差/外差RF接收器。 当第一和第二混频器被配置为并行操作时，可配置零差/外差RF接收器用作零差接收器，并且当第一和第二混频器被配置为串联操作时作为外差接收器。 本发明的实施例还提供了一种采用可配置零差/外差RF接收机以便于听话之前功能的RFID阅读器。

公开(公告)号：US07436252B2

公开(公告)日：2008-10-14

申请号：US11529076

申请日：2006-09-28

Applicant: Dana Taipale ,  Javier Elenes

Inventor： Dana Taipale ,  Javier Elenes

IPC: H03D1/00

CPC classification number: H03D1/2245

Abstract: In one aspect, the present invention includes a method for receiving an amplitude modulation (AM) signal in a receiver and performing a coordinate rotation digital computer (CORDIC) operation in obtaining a demodulated AM signal. The demodulated AM signal may be obtained from a magnitude output of the CORDIC operation or as a real output of a multiplication between a complex baseband signal and a demodulating carrier signal generated in a feedback loop.

Abstract translation: 一方面，本发明包括一种在接收机中接收幅度调制（AM）信号并且在获得解调的AM信号中执行坐标旋转数字计算机（CORDIC）操作的方法。 解调的AM信号可以从CORDIC操作的幅度输出中获得，或者作为在反馈回路中产生的复基带信号和解调载波信号之间的乘法的实际输出。

公开(公告)号：US20080247490A1

公开(公告)日：2008-10-09

申请号：US11996299

申请日：2006-07-26

Applicant: Rob Fortuin ,  Hubertus J. F. Maas

Inventor： Rob Fortuin ,  Hubertus J. F. Maas

IPC: H03D1/24 ,  H04L7/00

CPC classification number: H03D1/2245 ,  H04B1/30

Abstract: In a receiver, a synchronization circuit (MIX2, OSC, C1, R1) provides a set of oscillator signals (OSI, OSQ) that are synchronized with a carrier of an amplitude-modulated signal. The set of oscillator signals (OSI, OSQ) comprises a quadrature oscillator signal (OSQ), which is substantially 90° phase shifted with respect to the carrier of the amplitude-modulated signal. A quadrature mixer (MIX2) mixes the quadrature oscillator signal (OSQ) with the amplitude-modulated signal so as to obtain a quadrature mixer output signal (MO2a). A phase-error corrector (PEC) adjusts the phase of the oscillator signals in response to a variation in the magnitude of an alternating current component (AC) in the quadrature mixer output signal (MO2a).

Abstract translation: 在接收机中，同步电路（MIX 2，OSC，C 1，R 1）提供与幅度调制信号的载波同步的一组振荡器信号（OSI，OSQ）。 振荡器信号（OSI，OSQ）的集合包括正交振荡器信号（OSQ），其相对于幅度调制信号的载波基本上相移90°。 正交混频器（MIX2）将正交振荡器信号（OSQ）与幅度调制信号混合，以获得正交混频器输出信号（MO2a）。 相位误差校正器（PEC）响应于正交混频器输出信号（MO2a）中的交流分量（AC）的幅度的变化来调节振荡器信号的相位。

公开(公告)号：US07113760B1

公开(公告)日：2006-09-26

申请号：US10426383

申请日：2003-04-29

Applicant: Andrei R. Petrov ,  Shane A. Blanchard

Inventor： Andrei R. Petrov ,  Shane A. Blanchard

IPC: H04B1/26

CPC classification number: H03D1/2245 ,  H04B1/30

Abstract: A receiver circuit that includes a direct conversion receiver that receives a modulated signal, and generates an in-phase differential signal and a quadrature-phase differential signal. The receiver circuit includes an in-phase branch that processes the in-phase differential signal, and a quadrature-phase branch that processes the quadrature-phase differential signal. Each branch includes an amplifier and a summer. The amplifier is configured to receive and amplify the respective in-phase or quadrature-phase differential signal. The summer receives the resulting amplified differential signal and sums the signals to generate a single signal. A log amplifier receives the summed in-phase and quadrature-phase signal, and generates an RSSI signal that is proportional to the log of the difference between the two summed signals. The data may then be extracted based on the amplitude of the RSSI signal.

Abstract translation: 一种接收机电路，包括接收调制信号的直接转换接收机，并产生同相差分信号和正交相位差分信号。 接收器电路包括处理同相差分信号的同相分支和处理正交相差分信号的正交相分支。 每个分支包括一个放大器和一个夏天。 放大器被配置为接收和放大相应的同相或正交相差分信号。 夏天接收所得到的放大的差分信号，并且对信号求和以产生单个信号。 对数放大器接收相加和相位相加的信号，并产生与两个求和信号之差的对数成正比的RSSI信号。 然后可以基于RSSI信号的幅度来提取数据。

公开(公告)号：US20060109128A1

公开(公告)日：2006-05-25

申请号：US10993316

申请日：2004-11-19

Applicant: Bernard Barink ,  Loek d'Hont

Inventor： Bernard Barink ,  Loek d'Hont

IPC: G08B13/14

CPC classification number: H03D1/2245 ,  G06K7/0008

Abstract: An RFID circuit comprising an RF carrier signal source, a hybrid coupled to the RF carrier signal source operable to generate first and second phase-shifted RF carrier signals, first and second mixers coupled to the hybrid each operable to multiply a respective one of the first and second carrier signals and a received backscattered modulated carrier signal and generate first and second baseband signals, respectively, and first logic coupled to the first and second mixers operable to select one of the first and second baseband signals having a larger amplitude as a demodulated RFID output signal.

Abstract translation: 一种RFID电路，包括RF载波信号源，耦合到RF载波信号源的混合器，可操作以产生第一和第二相移RF载波信号;耦合到混合器的第一和第二混频器，可操作以将第一和第二相移RF RF 和第二载波信号和接收的反向散射调制载波信号，并且分别产生第一和第二基带信号，并且耦合到第一和第二混频器的第一逻辑可操作以选择具有较大幅度的第一和第二基带信号之一作为解调RFID 输出信号。

公开(公告)号：US07019599B2

公开(公告)日：2006-03-28

申请号：US10501384

申请日：2003-01-14

Applicant: Dong Weon Yoon

Inventor： Dong Weon Yoon

IPC: H03K7/00

CPC classification number: H04L27/362 ,  H03C1/50 ,  H03C3/40 ,  H03D1/2245 ,  H03D3/007 ,  H03D7/166 ,  H04L27/2017 ,  H04L27/3494 ,  H04L27/3836

Abstract: An apparatus for continuous phase quadrature amplitude modulation and demodulation to continuously process phases and amplitudes at symbol change points in an M-ary quadrature amplitude modulation method. The apparatus includes a continuous phase quadrature modulator having a first multiplier multiplying an I-channel by a cosine wave weighted function, a second multiplier multiplying an output signal of the first multiplier by a cosine wave of a carrier frequency, a delay delaying a Q-channel by a predetermined time, a third multiplier multiplying the Q-channel by a sine wave weighted function, a fourth multiplier multiplying an output signal of the third multiplier by the sine wave of the carrier frequency, and an adder adding an output signal of the second multiplier and an output signal of the fourth multiplier; and a continuous phase quadrature demodulator having a fifth multiplier multiplying the I-channel by the cosine wave of the carrier frequency, a sixth multiplier multiplying a signal from the fifth multiplier by the cosine wave weighted function, a first integrator and sampler integrating a signal from the sixth multiplier for the symbol duration time, a seventh multiplier multiplying the Q-channel by the sine wave of the carrier frequency, an eighth multiplier multiplying a signal from the seventh multiplier by the sine wave weighted function, and a second integrator and sampler integrating a signal from the eighth multiplier by the symbol duration time.

Abstract translation: 一种用于连续相位正交幅度调制和解调的装置，用于在M进制正交幅度调制方法中连续处理符号变化点处的相位和幅度。 该装置包括：连续相位正交调制器，其具有第一乘法器，将I信道乘以余弦波加权函数，第二乘法器将第一乘法器的输出信号乘以载波余弦波;延迟延迟Q- 频道乘以预定时间，第三乘法器将Q信道乘以正弦波加权函数，第四乘法器将第三乘法器的输出信号乘以载波频率的正弦波，以及加法器将输出信号 第二乘法器和第四乘法器的输出信号; 以及具有第五乘法器的连续相位正交解调器，其具有将所述I信道乘以所述载波频率的余弦波，第六乘法器将来自所述第五乘法器的信号乘以余弦波加权函数;第一积分器和采样器， 符号持续时间的第六乘法器，第七乘法器将Q信道乘以载波频率的正弦波，第八乘法器将来自第七乘法器的信号乘以正弦波加权函数，以及第二积分器和采样器积分 来自第八乘数的符号持续时间的信号。

公开(公告)号：US06999528B2

公开(公告)日：2006-02-14

申请号：US09947145

申请日：2001-09-05

Applicant: Veselin Brankovic ,  Dragan Krupezevic ,  Mohamed Ratni ,  Masayoshi Abe ,  Noboru Sasho

Inventor： Veselin Brankovic ,  Dragan Krupezevic ,  Mohamed Ratni ,  Masayoshi Abe ,  Noboru Sasho

IPC: H03D3/22 ,  H04L27/22

CPC classification number: H03D1/2245 ,  H03D3/007 ,  H03D9/04 ,  H04B1/30

Abstract: The present invention relates to a method and a device for the I/Q demodulation of modulated RF signals. The I/Q demodulator (60) has a first input for the RF signal (61) to be demodulated and a second input for a RF signal (62) originating from a local oscillator (20). The demodulator (60) combines the two RF signals (61,62) to generate three output signals supplied to three power detectors. In a combination unit (70) the three power signals of the power detectors are merged in two signal branches wherein after passing an A/D converting (72) and digital processing unit (73) one signal is the I component and the other one is the Q component of the received modulated RF signal (61).

Abstract translation: 本发明涉及用于调制RF信号的I / Q解调的方法和装置。 I / Q解调器（60）具有要被解调的RF信号（61）的第一输入和源自本地振荡器（20）的RF信号（62）的第二输入。 解调器（60）组合两个RF信号（61,62）以产生提供给三个功率检测器的三个输出信号。 在组合单元（70）中，功率检测器的三个功率信号被合并在两个信号分支中，其中在通过A / D转换（72）和数字处理单元（73）之后，一个信号是I分量，另一个是 所接收的调制RF信号（61）的Q分量。

公开(公告)号：US20050068096A1

公开(公告)日：2005-03-31

申请号：US10501384

申请日：2003-01-14

Applicant: Dong Yoon

Inventor： Dong Yoon

IPC: H03C1/50 ,  H03C3/40 ,  H03D1/22 ,  H03D3/00 ,  H03D7/16 ,  H04L27/20 ,  H04L27/22 ,  H04L27/34 ,  H04L27/36 ,  H04L27/38

CPC classification number: H04L27/362 ,  H03C1/50 ,  H03C3/40 ,  H03D1/2245 ,  H03D3/007 ,  H03D7/166 ,  H04L27/2017 ,  H04L27/3494 ,  H04L27/3836

Abstract: An apparatus for continuous phase quadrature amplitude modulation and demodulation to continuously process phases and amplitudes at symbol change points in an M-ary quadrature amplitude modulation method. The apparatus includes a continuous phase quadrature modulator having a first multiplier multiplying an I-channel by a cosine wave weighted function, a second multiplier multiplying an output signal of the first multiplier by a cosine wave of a carrier frequency, a delay delaying a Q-channel by a predetermined time, a third multiplier multiplying the Q-channel by a sine wave weighted function, a fourth multiplier multiplying an output signal of the third multiplier by the sine wave of the carrier frequency, and an adder adding an output signal of the second multiplier and an output signal of the fourth multiplier; and a continuous phase quadrature demodulator having a fifth multiplier multiplying the I-channel by the cosine wave of the carrier frequency, a sixth multiplier multiplying a signal from the fifth multiplier by the cosine wave weighted function, a first integrator and sampler integrating a signal from the sixth multiplier for the symbol duration time, a seventh multiplier multiplying the Q-channel by the sine wave of the carrier frequency, an eighth multiplier multiplying a signal from the seventh multiplier by the sine wave weighted function, and a second integrator and sampler integrating a signal from the eighth multiplier by the symbol duration time.

Abstract translation: 一种用于连续相位正交幅度调制和解调的装置，用于在M进制正交幅度调制方法中连续处理符号变化点处的相位和幅度。 该装置包括：连续相位正交调制器，其具有第一乘法器，将I信道乘以余弦波加权函数，第二乘法器将第一乘法器的输出信号乘以载波余弦波;延迟延迟Q- 频道乘以预定时间，第三乘法器将Q信道乘以正弦波加权函数，第四乘法器将第三乘法器的输出信号乘以载波频率的正弦波，以及加法器将输出信号 第二乘法器和第四乘法器的输出信号; 以及具有第五乘法器的连续相位正交解调器，其具有将所述I信道乘以所述载波频率的余弦波，第六乘法器将来自所述第五乘法器的信号乘以余弦波加权函数;第一积分器和采样器， 符号持续时间的第六乘法器，第七乘法器将Q信道乘以载波频率的正弦波，第八乘法器将来自第七乘法器的信号乘以正弦波加权函数，以及第二积分器和采样器积分 来自第八乘数的符号持续时间的信号。

公开(公告)号：US20040234011A1

公开(公告)日：2004-11-25

申请号：US10874014

申请日：2004-06-21

Inventor： Bengt Lindoff ,  William O. Camp JR.

IPC: H04L001/00

CPC classification number: H04L25/0212 ,  H03D1/2245 ,  H04L25/061

Abstract: An apparatus and method are provided that compensates for the problematic time-varying DC offset by effectively eliminating a near-channel amplited modulated interferer from a signal. The apparatus includes a first channel estimator for estimating a plurality of first channel filter taps null using a first signal model St, and a second channel estimator for estimating a plurality of second channel filter taps {tilde over (H)} using a second signal model {tilde over (S)}t. The apparatus also includes a processor for selecting which of the first signal model St and the second signal model {tilde over (S)}t is to be used or was used to substantially eliminate the near-channel amplitude modulated interferer from the received signal. The apparatus can be a mobile phone, base station, direct conversion receiver, or communications system (for example).

Abstract translation: 提供了一种通过有效地消除信号中的近通道放大调制干扰源来补偿有问题的时变DC偏移的装置和方法。 该装置包括：第一信道估计器，用于使用第一信号模型St估计多个第一信道滤波器抽头H;以及第二信道估计器，用于使用第二信号模型St估计多个第二信道滤波器抽头H.该装置还包括 用于选择第一信号模型St和第二信号模型St中的哪一个将被使用或用于基本上从接收信号中消除近通道幅度调制干扰源的处理器。 该装置可以是移动电话，基站，直接转换接收机或通信系统（例如）。