公开(公告)号：JP2010041081A

公开(公告)日：2010-02-18

申请号：JP2008198213

申请日：2008-07-31

Applicant: Panasonic Corp ,  パナソニック株式会社

Inventor： KODAMA NOBUTAKA ,  KOGA HISAO

IPC: H04J11/00

CPC classification number: H04L27/0014 ,  H04L27/2647 ,  H04L27/2656

Abstract: PROBLEM TO BE SOLVED: To accurately determine presence/absence of a multi-carrier signal in a short time. SOLUTION: In a carrier detector of a communication device, a phase difference between symbols continuous in each sub-carrier in OFDM signals is calculated in an inter-symbol calculation part 613 first, and then the sub-carriers where the phase difference between the continuous symbols is equal to or smaller than π/4 are selected in a carrier selection part 615. Then, the phase difference between sub-carriers adjacent to each other is calculated in an inter-carrier calculation part 614, and a quadrant counter 616 executes counting in accordance with each quadrant for which signal points representing the phase difference between the adjacent sub-carriers exist on the complex plane. Then, in a comparison part 617, whether the ratio of the count value of a specified quadrant to the total number (inter-carrier total number) of sets of adjacent sub-carriers selected in the carrier selection part 615 is equal to or larger than a predetermined ratio, and thus the presence/absence of the carrier is determined. COPYRIGHT: (C)2010,JPO&INPIT

Abstract translation: 要解决的问题：在短时间内准确地确定多载波信号的存在/不存在。 解决方案：在通信设备的载波检测器中，首先在符号间计算部分613中计算在OFDM信号中的每个子载波中连续的符号之间的相位差，然后计算相位差 在载波选择部615中选择等于或小于π/ 4的连续符号之间。然后，在载波间计算部614中计算彼此相邻的子载波之间的相位差，并且使用象限计数器 616根据在复平面上存在表示相邻副载波之间的相位差的信号点的每个象限执行计数。 然后，在比较部617中，在载波选择部615中选择的相邻子载波组的规定象限的计数值与总数（载波间总数）的比率是否等于或大于 预定比例，因此确定载体的存在/不存在。 版权所有（C）2010，JPO＆INPIT

公开(公告)号：JP2009212795A

公开(公告)日：2009-09-17

申请号：JP2008053471

申请日：2008-03-04

Applicant: Panasonic Corp ,  パナソニック株式会社

Inventor： KODAMA NOBUTAKA ,  KOGA HISAO

IPC: H04J11/00 ,  H03H17/06 ,  H03H17/08 ,  H04B3/54

Abstract: PROBLEM TO BE SOLVED: To increase transmission efficiency by inhibiting an influence of group delay of a filter to be provided in order to pass through a working frequency band thereby making a frequency band near a passing frequency of the filter usable.
SOLUTION: An analog part 301 which is an input part of a receiving part 300 of a PLC modem 10 is provided with an analog high-pass filter (HPF) 311 which shields frequencies lower than a predetermined working frequency band. A digital part 302 is provided with an inverse delay characteristic filter 321 which has inverse characteristics of group delay characteristics of the analog HPF 311 as a filter coefficient. By the inverse delay characteristic filter 321, the group delay characteristics of the analog HPF 311 are corrected, and deterioration in CINR due to group delay is inhibited.
COPYRIGHT: (C)2009,JPO&INPIT

Abstract translation: 要解决的问题：为了通过抑制要提供的滤波器的组延迟的影响来提高传输效率，以便通过工作频带，从而使接近滤波器可用频率的频带。 解决方案：作为PLC调制解调器10的接收部分300的输入部分的模拟部分301设置有屏蔽低于预定工作频带的频率的模拟高通滤波器（HPF）311。 数字部分302设置有具有作为滤波器系数的模拟HPF 311的组延迟特性的反特性的逆延迟特性滤波器321。 通过逆延迟特性滤波器321，校正模拟HPF 311的组延迟特性，并且抑制由于组延迟引起的CINR的劣化。 版权所有（C）2009，JPO＆INPIT

公开(公告)号：JP2009159640A

公开(公告)日：2009-07-16

申请号：JP2009098271

申请日：2009-04-14

Applicant: Panasonic Corp ,  パナソニック株式会社

Inventor： KURODA TAKESHI ,  KUROBE AKIO ,  IKEDA KOJI ,  KOGA HISAO ,  IGATA YUJI

IPC: H04L12/28

CPC classification number: H04B7/2643 ,  H04B3/542 ,  H04B2203/5408 ,  H04B2203/5445

Abstract: PROBLEM TO BE SOLVED: To provide a communication apparatus capable of flexible FDM frequency allocation using a small amount of signal so as to achieve a communication system which can achieve coexistence of an access system and an in-home system using a simple method while satisfying different QoS requirements of a plurality of different types of data streams. SOLUTION: A frequency band is divided into N subchannels. Subchannels are first allocated for a power line communication system (A) having a higher priority, such as public communication or the like. Subchannels to be used by a power line communication system (B) having a relatively low priority, such as in-home communication or the like, are allocated from free subchannels. In this case, the subchannels used by the power line communication system (A) having the high priority are limited to a plurality of consecutive subchannels from an upper side or a lower side of the frequency band. COPYRIGHT: (C)2009,JPO&INPIT

Abstract translation: 解决的问题：提供一种能够使用少量信号进行灵活的FDM频率分配的通信装置，以便实现能够使用简单方法实现接入系统和家庭内系统共存的通信系统 同时满足多种不同类型的数据流的不同QoS要求。 解决方案：频带分为N个子信道。 子信道首先被分配给具有较高优先级的电力线通信系统（A），诸如公共通信等。 由自由子信道分配由具有较低优先级的电力线通信系统（B）使用的子信道，诸如家庭内通信等。 在这种情况下，具有高优先级的电力线通信系统（A）使用的子信道被限制在从频带的上侧或下侧的多个连续的子信道。 版权所有（C）2009，JPO＆INPIT