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公开(公告)号：US08515477B2
公开(公告)日：2013-08-20
申请号：US12673885
申请日：2009-06-26
IPC分类号： H04W72/08
CPC分类号： H04W72/085 , H04L1/1893 , H04L5/06 , H04W28/04
摘要： A base station includes: an estimation section estimating transmission condition of each of frequency channels used for communication; a reception section receiving a data signal from each communication terminal through any of the frequency channels; a measurement section measuring received signal power of the received data signal for each frequency channel; a determination section determining, for each frequency channel, whether the received data signal is demodulated errorlessly; and a control section assigning frequency channels estimated as being in good transmission condition by the estimation section, to communication terminals the data signals of which are determined as not being errorlessly demodulated by the determination section, such that a frequency channel in a better transmission condition is assigned preferentially to a communication terminal having larger received signal power detected by the detection section, and transmitting retransmission request signals requesting the communication terminals to retransmit the data signals using the assigned frequency channels.
摘要翻译： 基站包括：估计部，估计用于通信的每个频道的传输条件; 接收部分，通过任何频道从每个通信终端接收数据信号; 测量部分，测量每个频道的接收数据信号的接收信号功率; 确定部，为每个频道确定所接收的数据信号是否无误地解调; 以及控制部，通过所述估计部分将被估计为处于良好发送状态的频率信道分配给所述数据信号被确定为不被所述确定部无错误地解调的通信终端，使得更好的发送条件下的频道为 优先分配给具有由检测部检测到的较大接收信号功率的通信终端，以及发送请求通信终端的重传请求信号，以使用所分配的频率信道重传数据信号。
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公开(公告)号：US20110086661A1
公开(公告)日：2011-04-14
申请号：US12673885
申请日：2009-06-26
IPC分类号： H04W72/08
CPC分类号： H04W72/085 , H04L1/1893 , H04L5/06 , H04W28/04
摘要： A base station includes: an estimation section estimating transmission condition of each of frequency channels used for communication; a reception section receiving a data signal from each communication terminal through any of the frequency channels; a measurement section measuring received signal power of the received data signal for each frequency channel; a determination section determining, for each frequency channel, whether the received data signal is demodulated errorlessly; and a control section assigning frequency channels estimated as being in good transmission condition by the estimation section, to communication terminals the data signals of which are determined as not being errorlessly demodulated by the determination section, such that a frequency channel in a better transmission condition is assigned preferentially to a communication terminal having larger received signal power detected by the detection section, and transmitting retransmission request signals requesting the communication terminals to retransmit the data signals using the assigned frequency channels.
摘要翻译： 基站包括：估计部，估计用于通信的每个频道的传输条件; 接收部分，通过任何频道从每个通信终端接收数据信号; 测量部分，测量每个频道的接收数据信号的接收信号功率; 确定部，为每个频道确定所接收的数据信号是否无误地解调; 以及控制部，通过所述估计部分将被估计为处于良好发送状态的频率信道分配给所述数据信号被确定为不被所述确定部无错误地解调的通信终端，使得更好的发送条件下的频率信道为 优先分配给具有由检测部检测到的较大接收信号功率的通信终端，以及发送请求通信终端的重传请求信号，以使用所分配的频率信道重传数据信号。
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3.发明授权Control device, communication terminal, control method, and communication method 有权控制装置，通讯终端，控制方式及通讯方式公开(公告)号：US08274926B2
公开(公告)日：2012-09-25
申请号：US12677730
申请日：2009-07-08
申请人： Naganori Shirakata , Hironori Nakae , Koji Imamura
发明人： Naganori Shirakata , Hironori Nakae , Koji Imamura
IPC分类号： H04B7/212 , H04W4/00 , G06F15/173
CPC分类号： H04W72/082 , H04W72/042 , H04W84/10
摘要： In a wireless communication system according to the present invention: a control device and a communication terminal communicate in an active period. The control device: generates a first beacon packet including one or more candidate channels; transmits the first beacon packet at the beginning of the active period; determines whether or not a use channel is to be changed based on a communication state, and generates a second beacon packet including information of a determination result; transmits the second beacon packet at the end of the active period; and, when it is determined that the use channel is to be changed, changes the use channel after the active period ends and before a next active period starts. The communication terminal: receives the first and second beacon packets; and, based on the second beacon packet, changes the use channel after the active period ends and before a next active period starts.
摘要翻译： 在根据本发明的无线通信系统中，控制装置和通信终端在活动期间进行通信。 控制装置：生成包括一个或多个候选信道的第一信标包; 在活动期的开始时发送第一信标分组; 基于通信状态确定是否要改变使用信道，并生成包含确定结果信息的第二信标包; 在活动期结束时发送第二信标包; 并且当确定要改变使用频道时，在有效时段结束之后和在下一活动时段开始之前改变使用频道。 通信终端：接收第一和第二信标分组; 并且基于第二信标包在活动时段结束之后并且在下一活动时段开始之前改变使用频道。
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公开(公告)号：US20100260084A1
公开(公告)日：2010-10-14
申请号：US12675588
申请日：2009-06-29
CPC分类号： H04W52/0216 , H04W76/28 , Y02D70/142 , Y02D70/144 , Y02D70/166 , Y02D70/168
摘要： Provided is a compact and low power consumption wireless communication system, including a base station and communication terminals, in which power consumption of the communication terminal is reduced. The base station alternately sets an active interval during which predetermined data communication is performed, and an inactive interval during which the predetermined data communication is not performed. During the active interval, a beacon including information indicating a start timing of a subsequent active interval is transmitted and received. During the inactive interval, a sub-beacon including information providing notice of a transmission timing of a subsequent beacon is transmitted and received. When receiving the sub-beacon, the communication terminal obtains the transmission timing of the subsequent beacon and stops a supply of power to an unit related to a wireless communication function until the transmission timing.
摘要翻译： 提供了一种紧凑且低功耗的无线通信系统，其包括基站和通信终端，其中通信终端的功耗被降低。 基站交替地设置执行预定数据通信的活动间隔，以及不执行预定数据通信的无效间隔。 在活动间隔期间，发送并接收包括指示后续活动间隔的开始定时的信息的信标。 在非活动间隔期间，发送并接收包括提供通知后续信标的发送定时的信息的子信标。 当接收到子信标时，通信终端获得后续信标的发送定时，并停止向与无线通信功能相关的单元的电力供应直到发送定时。
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5.发明申请CONTROL DEVICE, COMMUNICATION TERMINAL, CONTROL METHOD, AND COMMUNICATION METHOD 有权控制装置，通信终端，控制方法和通信方法公开(公告)号：US20110261764A1
公开(公告)日：2011-10-27
申请号：US12677730
申请日：2009-07-08
申请人： Naganori Shirakata , Hironori Nakae , Koji Imamura
发明人： Naganori Shirakata , Hironori Nakae , Koji Imamura
IPC分类号： H04W72/04
CPC分类号： H04W72/082 , H04W72/042 , H04W84/10
摘要： In a wireless communication system according to the present invention: a control device and a communication terminal communicate in an active period. The control device: generates a first beacon packet including one or more candidate channels; transmits the first beacon packet at the beginning of the active period; determines whether or not a use channel is to be changed based on a communication state, and generates a second beacon packet including information of a determination result; transmits the second beacon packet at the end of the active period; and, when it is determined that the use channel is to be changed, changes the use channel after the active period ends and before a next active period starts. The communication terminal: receives the first and second beacon packets; and, based on the second beacon packet, changes the use channel after the active period ends and before a next active period starts.
摘要翻译： 在根据本发明的无线通信系统中，控制装置和通信终端在活动期间进行通信。 控制装置：生成包括一个或多个候选信道的第一信标包; 在活动期的开始时发送第一信标分组; 基于通信状态确定是否要改变使用信道，并生成包含确定结果信息的第二信标包; 在活动期结束时发送第二信标包; 并且当确定要改变使用频道时，在有效时段结束之后和在下一活动时段开始之前改变使用频道。 通信终端：接收第一和第二信标分组; 并且基于第二信标包在活动时段结束之后并且在下一活动时段开始之前改变使用频道。
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6.发明授权Modulator, demodulator, and transmission system for use in OFDM transmission 有权用于OFDM传输的调制器，解调器和传输系统公开(公告)号：US06618352B1
公开(公告)日：2003-09-09
申请号：US09317961
申请日：1999-05-25
IPC分类号： H04J1100
CPC分类号： H04L27/2657 , H04L27/2679
摘要： An input of an OFDM signal containing known pilot carriers among given subcarriers is separated into subcarriers through Fourier transform in a fast Fourier transform unit. A data carrier phase error estimating unit obtains an amount of phase correction of each subcarrier on the basis of the pilot carriers in the separated subcarriers. A data carrier phase correcting unit corrects the phase of the separated subcarrier signal on the basis of the amount of phase correction. Thus, the phase errors of the subcarriers can be corrected and the OFDM symbols can be demodulated even if a frequency error and a timing error are occurring between the transmitter and receiver.
摘要翻译： 在给定子载波中包含已知导频载波的OFDM信号的输入通过傅里叶变换在快速傅立叶变换单元中被分离成副载波。 数据载波相位误差估计单元基于分离的子载波中的导频载波来获得每个子载波的相位校正量。 数据载波相位校正单元根据相位校正量校正分离的副载波信号的相位。 因此，即使在发射机和接收机之间出现频率误差和定时误差，也可以校正子载波的相位误差并且可以解调OFDM符号。
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公开(公告)号：US06169751A
公开(公告)日：2001-01-02
申请号：US09036784
申请日：1998-03-09
IPC分类号： H04J100
CPC分类号： H04L27/2662 , H04L27/2656 , H04L27/2657 , H04L27/2675
摘要： An OFDM receiving apparatus converts a received OFDM signal based on two sampling timing signals to detect reference symbols intermittently inserted in the OFDM signal. Based on the detected reference symbols, a frame synchronization is established. Further, clock components in the reference symbols are extracted, and compared with the sampling timing signals only in the reference symbol duration to obtain a phase error. Based on the phase error, the sampling timing signal is controlled to establish a bit-synchronization. For this purpose, at least two samplers, delayer, and phase error holder are provided.
摘要翻译： OFDM接收装置基于两个采样定时信号来转换接收的OFDM信号，以检测在OFDM信号中间歇地插入的参考符号。 基于检测到的参考符号，建立帧同步。 此外，提取参考符号中的时钟分量，并且仅在参考符号持续时间内与采样定时信号进行比较以获得相位误差。 基于相位误差，采样定时信号被控制以建立位同步。 为此，提供至少两个采样器，延迟器和相位误差保持器。
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公开(公告)号：US08295218B2
公开(公告)日：2012-10-23
申请号：US12675588
申请日：2009-06-29
CPC分类号： H04W52/0216 , H04W76/28 , Y02D70/142 , Y02D70/144 , Y02D70/166 , Y02D70/168
摘要： Provided is a compact and low power consumption wireless communication system, including a base station and communication terminals, in which power consumption of the communication terminal is reduced. The base station alternately sets an active interval during which predetermined data communication is performed, and an inactive interval during which the predetermined data communication is not performed. During the active interval, a beacon including information indicating a start timing of a subsequent active interval is transmitted and received. During the inactive interval, a sub-beacon including information providing notice of a transmission timing of a subsequent beacon is transmitted and received. When receiving the sub-beacon, the communication terminal obtains the transmission timing of the subsequent beacon and stops a supply of power to an unit related to a wireless communication function until the transmission timing.
摘要翻译： 提供了一种紧凑且低功耗的无线通信系统，其包括基站和通信终端，其中通信终端的功耗被降低。 基站交替地设置执行预定数据通信的活动间隔，以及不执行预定数据通信的无效间隔。 在活动间隔期间，发送并接收包括指示后续活动间隔的开始定时的信息的信标。 在非活动间隔期间，发送并接收包括提供通知后续信标的发送定时的信息的子信标。 当接收到子信标时，通信终端获得后续信标的发送定时，并停止向与无线通信功能相关的单元的电力供应直到发送定时。
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9.发明授权Modulator, demodulator, and transmission system for use in OFDM transmission 有权用于OFDM传输的调制器，解调器和传输系统公开(公告)号：US06944122B2
公开(公告)日：2005-09-13
申请号：US10614291
申请日：2003-07-08
CPC分类号： H04L27/2657 , H04L27/2679
摘要： An input of an OFDM signal containing known pilot carriers among given subcarriers is separated into subcarriers through Fourier transform in a fast Fourier transform unit. A data carrier phase error estimating unit obtains an amount of phase correction of each subcarrier on the basis of the pilot carriers in the separated subcarriers. A data carrier phase correcting unit corrects the phase of the separated subcarrier signal on the basis of the amount of phase correction. Thus, the phase errors of the subcarriers can be corrected and the OFDM symbols can be demodulated even if a frequency error and a timing error are occurring between the transmitter and receiver.
摘要翻译： 在给定子载波中包含已知导频载波的OFDM信号的输入通过傅里叶变换在快速傅立叶变换单元中被分离成副载波。 数据载波相位误差估计单元基于分离的子载波中的导频载波来获得每个子载波的相位校正量。 数据载波相位校正单元根据相位校正量校正分离的副载波信号的相位。 因此，即使在发射机和接收机之间出现频率误差和定时误差，也可以校正子载波的相位误差并且可以解调OFDM符号。
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公开(公告)号：US08693592B2
公开(公告)日：2014-04-08
申请号：US12597571
申请日：2008-03-10
IPC分类号： H04L27/06
CPC分类号： H03G3/3052 , H03G3/3068
摘要： An AGC unit starts a gain control of the variable gain amplifying unit when a bit saturation occurs in the digital baseband signal output from the A/D converting unit, and starts a gain control of the variable gain amplifying unit when a detection of STS from the digital baseband signal output from the A/D converting unit is started. The AGC unit performs the gain control of the variable gain amplifying unit once when the detection of STS is started, and performs the gain control of the variable gain amplifying unit twice when the bit saturation occurs, namely a larger number of times than when the detection of STS is started.
摘要翻译： 当从A / D转换单元输出的数字基带信号中产生位饱和时，AGC单元开始可变增益放大单元的增益控制，并且当从该A / D转换单元检测到STS时开始可变增益放大单元的增益控制 开始从A / D转换单元输出的数字基带信号。 当STS的检测开始时，AGC单元执行可变增益放大单元的增益控制，并且当发生位饱和时，执行可变增益放大单元的增益控制两次，即比检测时更大的次数 的STS已经开始了。
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