公开(公告)号：US09859948B2

公开(公告)日：2018-01-02

申请号：US14788918

申请日：2015-07-01

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Makoto Yasutake ,  Atsuyuki Yuasa

IPC: H04L27/20 ,  H04B1/69 ,  H04B1/707 ,  H04B1/02 ,  H04L27/00

CPC classification number: H04B1/69 ,  H04B1/02 ,  H04B1/707 ,  H04L27/20 ,  H04L27/2035 ,  H04L2027/0018 ,  H04L2027/0051 ,  H04L2027/0083

Abstract: A microprocessor includes a memory, an input/output port and a switch controller. Transmission data, a spread code and an inverted code are stored in the memory. The switch controller generates a spread spectrum signal by calling up either of the spread code or the inverted code in accordance with a bit of the transmission data. A switch connected to the input/output port is switched on and off based on the spread spectrum signal. In addition, an antenna is connected to the input/output port via a coupler. An oscillation circuit includes a reference oscillator and a BPF and inputs a harmonic of a reference signal to the coupler as a carrier wave.

公开(公告)号：US20160269206A1

公开(公告)日：2016-09-15

申请号：US15028269

申请日：2014-10-08

Applicant: NTT DOCOMO, INC.

Inventor： Jiyun Shen ,  Satoshi Suyama ,  Yukihiko Okumura

IPC: H04L27/00 ,  H04W16/32

CPC classification number: H04L27/0014 ,  H04L2027/0055 ,  H04L2027/0065 ,  H04L2027/0083 ,  H04W16/32

Abstract: To actualize frequency synchronization with each of radio communication systems while suppressing increase in circuit scale of a user terminal in an environment in which the user terminal concurrently communicates with a plurality of radio communication systems with different frequencies, a radio base station of the present invention is a radio base station for forming a narrow-area cell to communicate with a user terminal in a radio communication system where the narrow-area cell is provided inside a wide-area cell, and has a carrier frequency synthesizer that generates a carrier frequency of the narrow-area cell based on a wide-area radio signal transmitted from a radio base station for forming the wide-area cell, and a sampling frequency synthesizer that generates a sampling frequency of a baseband signal of the narrow-area cell based on the wide-area radio signal.

Abstract translation: 为了实现与各无线电通信系统的频率同步，同时抑制用户终端同时与具有不同频率的多个无线电通信系统通信的环境中的用户终端的电路规模的增加，本发明的无线电基站是 无线电基站，用于在广域小区内提供窄区域小区的无线电通信系统中形成与用户终端进行通信的窄区域小区，并且具有产生载波频率的载波频率合成器 基于从用于形成广域小区的无线基站发送的广域无线信号的窄区域小区，以及基于宽广的小区生成窄区域小区的基带信号的采样频率的采样频率合成器 - 无线电信号。

公开(公告)号：US08665859B2

公开(公告)日：2014-03-04

申请号：US13406955

申请日：2012-02-28

Applicant: Daniel J. Marchok ,  Samir Kapoor ,  Ravi Chandran

Inventor： Daniel J. Marchok ,  Samir Kapoor ,  Ravi Chandran

IPC: H04J3/06 ,  H04W56/00

CPC classification number: H04W56/00 ,  H04L5/0007 ,  H04L5/0051 ,  H04L5/023 ,  H04L5/1453 ,  H04L27/0014 ,  H04L27/2607 ,  H04L27/2613 ,  H04L27/2657 ,  H04L27/2662 ,  H04L27/2675 ,  H04L2027/0055 ,  H04L2027/0083

Abstract: A multi-point communications system is set forth herein. The communications system includes a transmitter for transmitting OFDM/DMT symbols over a predetermined number of bins across a transmission medium. The OFDM/DMT symbols are generated using at least one timing signal. At least one of the predetermined number of bins includes a pilot tone sub-symbol having a frequency corresponding to a clock signal. The communications system may also include a receiver for receiving the OFDM/DMT symbols via the transmission medium. The receiver demodulates the received symbols using at least one timing signal.

Abstract translation: 本文阐述了一种多点通信系统。 通信系统包括用于在传输介质上经过预定数量的箱传输OFDM / DMT符号的发射机。 使用至少一个定时信号来生成OFDM / DMT符号。 预定数量的箱中的至少一个包括具有对应于时钟信号的频率的导频音子符号。 通信系统还可以包括用于经由传输介质接收OFDM / DMT符号的接收机。 接收机使用至少一个定时信号来解调所接收的符号。

公开(公告)号：US07031344B2

公开(公告)日：2006-04-18

申请号：US09737678

申请日：2000-12-13

Applicant: Selim Shlomo Rakib ,  Yehuda Azenkot

Inventor： Selim Shlomo Rakib ,  Yehuda Azenkot

IPC: H04L7/00 ,  H04J13/00

CPC classification number: H04W48/16 ,  H03M13/256 ,  H03M13/39 ,  H03M13/41 ,  H04B1/1027 ,  H04B1/707 ,  H04B1/7087 ,  H04B7/2668 ,  H04B2201/709709 ,  H04H20/77 ,  H04H20/78 ,  H04J3/0602 ,  H04J3/0608 ,  H04J3/0638 ,  H04J3/0682 ,  H04J13/00 ,  H04J13/004 ,  H04J14/007 ,  H04L1/006 ,  H04L1/16 ,  H04L5/023 ,  H04L5/026 ,  H04L5/06 ,  H04L7/041 ,  H04L12/2801 ,  H04L25/03057 ,  H04L25/03343 ,  H04L25/4921 ,  H04L27/0014 ,  H04L27/2656 ,  H04L27/2657 ,  H04L27/2662 ,  H04L27/362 ,  H04L2025/03414 ,  H04L2027/0083 ,  H04L2027/0087 ,  H04N7/10 ,  H04N7/17309 ,  H04N7/54 ,  H04N21/2221 ,  H04N21/2408 ,  H04N21/4305 ,  H04N21/4383 ,  H04W24/00 ,  H04W56/00 ,  H04W74/0866

Abstract: A system for bidirectional communication of digital data between a central unit and a remote unit wherein the need for tracking loops in the central unit has been eliminated. The central unit transmitter generates a master carrier and a master clock signal which are used to transmit downstream data to the remote units. The remote units recover the master carrier and master clock and synchronize local oscillators in each remote unit to these master carrier and master clock signals to generate reference carrier and clock signals for use by the remote unit receiver. These reference carrier and clock signals are also used by the remote unit transmitters to transmit upstream data to the central unit. The central unit receiver detects the phase difference between the reference carrier and clock signals from the remote units periodically and adjusts the phase of the master carrier and master clock signals for use by the central unit receiver to receive the upstream data.

Abstract translation: 已经消除了用于在中央单元和远程单元之间双向通信数字数据的系统，其中在中央单元中需要跟踪回路。 中央单元发射机产生主载波和主时钟信号，用于将下行数据发送到远程单元。 远程单元恢复主载波和主时钟，并将每个远程单元中的本地振荡器与这些主载波和主时钟信号同步，以生成参考载波和时钟信号供远程单元接收机使用。 这些参考载波和时钟信号也被远程单元发射机用于将上行数据传输到中央单元。 中央单元接收机周期性地检测来自远程单元的参考载波和时钟信号之间的相位差，并调整主载波和主时钟信号的相位，供中央单元接收机使用以接收上行数据。

公开(公告)号：US07020165B2

公开(公告)日：2006-03-28

申请号：US09759774

申请日：2001-01-12

Applicant: Selim Shlomo Rakib ,  Yehuda Azenkot

Inventor： Selim Shlomo Rakib ,  Yehuda Azenkot

IPC: H04J1/00

CPC classification number: H04W48/16 ,  H03M13/256 ,  H03M13/39 ,  H03M13/41 ,  H04B1/1027 ,  H04B1/707 ,  H04B1/7087 ,  H04B7/2668 ,  H04B2201/709709 ,  H04H20/77 ,  H04H20/78 ,  H04J3/0602 ,  H04J3/0608 ,  H04J3/0638 ,  H04J3/0682 ,  H04J13/00 ,  H04J13/004 ,  H04J14/007 ,  H04L1/006 ,  H04L1/16 ,  H04L5/023 ,  H04L5/026 ,  H04L5/06 ,  H04L7/041 ,  H04L12/2801 ,  H04L25/03057 ,  H04L25/03343 ,  H04L25/4921 ,  H04L27/0014 ,  H04L27/2656 ,  H04L27/2657 ,  H04L27/2662 ,  H04L27/362 ,  H04L2025/03414 ,  H04L2027/0083 ,  H04L2027/0087 ,  H04N7/10 ,  H04N7/17309 ,  H04N7/54 ,  H04N21/2221 ,  H04N21/2408 ,  H04N21/4305 ,  H04N21/4383 ,  H04W24/00 ,  H04W56/00 ,  H04W74/0866

Abstract: A system for bidirectional communication of digital data between a central unit and a remote unit wherein the need for tracking loops in the central unit has been eliminated. The central unit transmitter generates a master carrier and a master clock signal which are used to transmit downstream data to the remote units. The remote units recover the master carrier and master clock and synchronize local oscillators in each remote unit to these master carrier and master clock signals to generate reference carrier and clock signals for use by the remote unit receiver. These reference carrier and clock signals are also used by the remote unit transmitters to transmit upstream data to the central unit. The central unit receiver detects the phase difference between the reference carrier and clock signals from the remote units periodically and adjusts the phase of the master carrier and master clock signals for use by the central unit receiver to receive the upstream data.

公开(公告)号：US07010062B2

公开(公告)日：2006-03-07

申请号：US09826969

申请日：2001-04-04

Applicant: Robindra B. Joshi ,  Jeffrey S. Putnam ,  Thuji S. Lin ,  Paul T. Yang

Inventor： Robindra B. Joshi ,  Jeffrey S. Putnam ,  Thuji S. Lin ,  Paul T. Yang

IPC: H04L27/14 ,  H04L27/22

CPC classification number: H04L27/152 ,  H04L27/2602 ,  H04L27/261 ,  H04L27/2657 ,  H04L27/2675 ,  H04L2027/0028 ,  H04L2027/0055 ,  H04L2027/0067 ,  H04L2027/0069 ,  H04L2027/0083

Abstract: A method of compensating for carrier frequency and phase errors of a received multi-carrier modulated signal. The received multi-carrier signal including modulated carriers for transmitting known data and unmodulated carriers for error correction, comprising, time domain down converting the received multi-carrier signal to base-band to provide a down-converted signal, the down-converted signal including a plurality of modulated carriers for transmitting known data and unmodulated carriers for error correction. Sampling an unmodulated carrier of the down-converted signal to provide received data samples. Providing a reference signal derived from the unmodulated carrier of the down-converted signal. And, estimating phase errors from a phase difference between the ummodulated carrier and the reference signal derived from the unmodulated carrier of the down-converted signal to provide a plurality of received sample phase error estimates for each modulated carrier.

公开(公告)号：US20040184484A1

公开(公告)日：2004-09-23

申请号：US10813695

申请日：2004-03-29

Inventor： Daniel J. Marchok ,  Samir Kapoor ,  Ravi Chandran

IPC: H04J001/00

CPC classification number: H04W56/00 ,  H04L5/0007 ,  H04L5/0051 ,  H04L5/023 ,  H04L5/1453 ,  H04L27/0014 ,  H04L27/2607 ,  H04L27/2613 ,  H04L27/2657 ,  H04L27/2662 ,  H04L27/2675 ,  H04L2027/0055 ,  H04L2027/0083

Abstract: A multi-point communications system is set forth herein. The communications system comprises a transmitter for transmitting OFDM/DMT symbols over a predetermined number of bins across a transmission medium. The OFDM/DMT symbols are generated using at least one timing signal. At least one of the predetermined number of bins includes a pilot tone sub-symbol having a frequency corresponding to the clock signal. The communications system also includes a receiver for receiving the OFDM/DMT symbols from the transmission medium. The receiver demodulates the received symbols using at least one timing signal. The receiver has a first pilot tone search mode of operation in which the receiver adjusts its timing signal to scan the frequency range of the predetermined number of bins looking for the pilot tone sub-symbol and identifies the bin including the pilot tone sub-symbol. The receiver further has a subsequent second pilot tone acquisition mode in which the receiver adjusts the timing signal to receive the identified bin containing the pilot tone sub-symbol and measures phase differences between successive pilot tone sub-symbols to thereby perform a further adjustment of the timing signal so that the pilot tone sub-symbol is received within a frequency range sufficient for subsequent phase locked loop processing thereof.

Abstract translation: 本文阐述了一种多点通信系统。 通信系统包括用于通过传输介质在预定数量的箱上发送OFDM / DMT符号的发射机。 使用至少一个定时信号来生成OFDM / DMT符号。 预定数量的箱中的至少一个包括具有对应于时钟信号的频率的导频音子符号。 通信系统还包括用于从传输介质接收OFDM / DMT符号的接收机。 接收机使用至少一个定时信号来解调所接收的符号。 接收机具有第一导频音搜索操作模式，其中接收机调整其定时信号以扫描寻找导频音子符号的预定数量的频道的频率范围，并识别包括导频音子符号的音箱。 接收机还具有随后的第二导频音调获取模式，其中接收机调整定时信号以接收包含导频音符号的识别的小区，并且测量连续的导频音子符号之间的相位差，从而进一步调整 定时信号，使得在对其后续的锁相环处理足够的频率范围内接收导频音子符号。

公开(公告)号：US20030156603A1

公开(公告)日：2003-08-21

申请号：US09764739

申请日：2001-01-16

Inventor： Selim Shlomo Rakib ,  Yehuda Azenkot

IPC: H04J001/00

CPC classification number: H04W48/16 ,  H03M13/256 ,  H03M13/39 ,  H03M13/41 ,  H04B1/1027 ,  H04B1/707 ,  H04B1/7087 ,  H04B7/2668 ,  H04B2201/709709 ,  H04H20/77 ,  H04H20/78 ,  H04J3/0602 ,  H04J3/0608 ,  H04J3/0638 ,  H04J3/0682 ,  H04J13/00 ,  H04J13/004 ,  H04J14/007 ,  H04L1/006 ,  H04L1/16 ,  H04L5/023 ,  H04L5/026 ,  H04L5/06 ,  H04L7/041 ,  H04L12/2801 ,  H04L25/03057 ,  H04L25/03343 ,  H04L25/4921 ,  H04L27/0014 ,  H04L27/2656 ,  H04L27/2657 ,  H04L27/2662 ,  H04L27/362 ,  H04L2025/03414 ,  H04L2027/0083 ,  H04L2027/0087 ,  H04N7/10 ,  H04N7/17309 ,  H04N7/54 ,  H04N21/2221 ,  H04N21/2408 ,  H04N21/4305 ,  H04N21/4383 ,  H04W24/00 ,  H04W56/00 ,  H04W74/0866

Abstract: A system for bidirectional communication of digital data between a central unit and a remote unit wherein the need for tracking loops in the central unit has been eliminated. The central unit transmitter generates a master carrier and a master clock signal which are used to transmit downstream data to the remote units. The remote units recover the master carrier and master clock and synchronize local oscillators in each remote unit to these master carrier and master clock signals to generate reference carrier and clock signals for use by the remote unit receiver. These reference carrier and clock signals are also used by the remote unit transmitters to transmit upstream data to the central unit. The central unit receiver detects the phase difference between the reference carrier and clock signals from the remote units periodically and adjusts the phase of the master carrier and master clock signals for use by the central unit receiver to receive the upstream data.

公开(公告)号：US20010046266A1

公开(公告)日：2001-11-29

申请号：US09755339

申请日：2001-01-03

Inventor： Selim Shlomo Rakib ,  Yehuda Azenkot

IPC: H04L027/00 ,  H04L007/00 ,  H04L025/00 ,  H04L025/40

CPC classification number: H04W48/16 ,  H03M13/256 ,  H03M13/39 ,  H03M13/41 ,  H04B1/1027 ,  H04B1/707 ,  H04B1/7087 ,  H04B7/2668 ,  H04B2201/709709 ,  H04H20/77 ,  H04H20/78 ,  H04J3/0602 ,  H04J3/0608 ,  H04J3/0638 ,  H04J3/0682 ,  H04J13/00 ,  H04J13/004 ,  H04J14/007 ,  H04L1/006 ,  H04L1/16 ,  H04L5/023 ,  H04L5/026 ,  H04L5/06 ,  H04L7/041 ,  H04L12/2801 ,  H04L25/03057 ,  H04L25/03343 ,  H04L25/4921 ,  H04L27/0014 ,  H04L27/2656 ,  H04L27/2657 ,  H04L27/2662 ,  H04L27/362 ,  H04L2025/03414 ,  H04L2027/0083 ,  H04L2027/0087 ,  H04N7/10 ,  H04N7/17309 ,  H04N7/54 ,  H04N21/2221 ,  H04N21/2408 ,  H04N21/4305 ,  H04N21/4383 ,  H04W24/00 ,  H04W56/00 ,  H04W74/0866

Abstract: A system for bidirectional communication of digital data between a central unit and a remote unit wherein the need for tracking loops in the central unit has been eliminated. The central unit transmitter generates a master carrier and a master clock signal which are used to transmit downstream data to the remote units. The remote units recover the master carrier and master clock and synchronize local oscillators in each remote unit to these master carrier and master clock signals to generate reference carrier and clock signals for use by the remote unit receiver. These reference carrier and clock signals are also used by the remote unit transmitters to transmit upstream data to the central unit. The central unit receiver detects the phase difference between the reference carrier and clock signals from the remote units periodically and adjusts the phase of the master carrier and master clock signals for use by the central unit receiver to receive the upstream data.

Abstract translation: 已经消除了用于在中央单元和远程单元之间双向通信数字数据的系统，其中在中央单元中需要跟踪环路。 中央单元发射机产生主载波和主时钟信号，用于将下行数据发送到远程单元。 远程单元恢复主载波和主时钟，并将每个远程单元中的本地振荡器与这些主载波和主时钟信号同步，以生成参考载波和时钟信号供远程单元接收机使用。 这些参考载波和时钟信号也被远程单元发射机用于将上行数据传输到中央单元。 中央单元接收机周期性地检测来自远程单元的参考载波和时钟信号之间的相位差，并调整主载波和主时钟信号的相位，供中央单元接收机使用以接收上行数据。

公开(公告)号：US20180076998A1

公开(公告)日：2018-03-15

申请号：US15691954

申请日：2017-08-31

Applicant: FUJITSU LIMITED

Inventor： Hideki MATSUI

IPC: H04L27/34 ,  H04B7/14 ,  H04L27/26

CPC classification number: H04L27/3461 ,  H04B7/14 ,  H04L27/205 ,  H04L27/2613 ,  H04L2027/0083

Abstract: A generating unit that generates phase difference-added first data obtained by adding a phase change according to second data to a first signal indicating first data and a transmitting unit that transmits the phase difference-added first data are provided, and thus the first data and the second data can be transmitted through a simple configuration.