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    • 2. 发明授权
    • Systems and methods for wireless communication using SDMA
    • 使用SDMA进行无线通信的系统和方法
    • US08310995B2
    • 2012-11-13
    • US11797321
    • 2007-05-02
    • Shinji MuraiTomoaki IshifujiTakashi YanoMasaaki ShidaShigenori Hayase
    • Shinji MuraiTomoaki IshifujiTakashi YanoMasaaki ShidaShigenori Hayase
    • H04W4/00
    • H04W72/085H04W28/18H04W72/046
    • In a wireless communication system for communicating with a plurality of stations at the same point of time with the same frequency using a Space Division Multiple Access (SDMA), wireless resources are allocated by a first decision unit which evaluates performance of each station obtained when the SDMA is used and which determines periods of time to be allocated to groups of stations formed according to the SDMA technique. Using a first evaluation unit and a second evaluation unit to evaluate performance required by each station and each application, the first decision unit allocates the wireless resources to the stations. It is therefore possible that the wireless resources are efficiently allocated to the stations while preventing an event in which the wireless resources are excessive or insufficient for required quality of service.
    • 在用于使用空分多址(SDMA)以相同频率在同一时间点与多个站进行通信的无线通信系统中,无线资源由第一决策单元分配,该第一决策单元评估当 使用SDMA,并确定要分配给根据SDMA技术形成的站组的时间段。 使用第一评估单元和第二评估单元来评估每个站点和每个应用所需的性能,第一决策单元向站点分配无线资源。 因此,可以将无线资源有效地分配给站,同时防止无线资源过多或不足以满足所需服务质量的事件。
    • 3. 发明授权
    • Radio communication device
    • 无线通信设备
    • US07660288B2
    • 2010-02-09
    • US11493556
    • 2006-07-27
    • Masaaki ShidaShigenori HayaseTomoaki Ishifuji
    • Masaaki ShidaShigenori HayaseTomoaki Ishifuji
    • H04J1/00
    • H04L27/2649H04B7/0417H04B7/0626H04L25/0204H04L27/2657H04L27/2662H04L2025/03426H04L2027/0024
    • Disclosed is a wireless communication system capable of performing demodulation at the receiving side without substantially deteriorating BER characteristics, regardless of carrier frequency error existing among plural wireless communication systems in SDMA of uplink. The wireless communication system includes plural antennas; a MIMO processor that decomposes a reception signal the plural antennas received from plural transmitters into transmission signals transmitted from the respective transmitters; a FFT processor that carries out OFDM demodulation; and a demapping unit that obtains data from signals which were previously converted into sub-carrier signals by the FFT processor, in which the MIMO processor is installed ahead of the FFT processor for sake of the processing sequence of a receive signal, and even though a carrier frequency offset exists in the reception signal MIMO processing is performed prior to OFDM demodulation to split the reception signal from plural transmitters.
    • 公开了无论在上行链路的SDMA中的多个无线通信系统中存在的载波频率误差如何,都能够在接收侧进行解调而不使BER特性实质恶化的无线通信系统。 无线通信系统包括多个天线; 将从多个发射机接收的多个天线的接收信号分解为从各个发射机发射的传输信号的MIMO处理器; 执行OFDM解调的FFT处理器; 以及解映射单元,其通过FFT处理器从先前被转换为子载波信号的信号获得数据,其中为处理接收信号的处理顺序而将MIMO处理器安装在FFT处理器之前,并且即使 载波频率偏移存在于接收信号中,在OFDM解调之前执行MIMO处理,以分割来自多个发射机的接收信号。
    • 4. 发明申请
    • Radio communication device
    • 无线通信设备
    • US20070086400A1
    • 2007-04-19
    • US11493556
    • 2006-07-27
    • Masaaki ShidaShigenori HayaseTomoaki Ishifuji
    • Masaaki ShidaShigenori HayaseTomoaki Ishifuji
    • H04Q7/24
    • H04L27/2649H04B7/0417H04B7/0626H04L25/0204H04L27/2657H04L27/2662H04L2025/03426H04L2027/0024
    • Disclosed is a wireless communication system capable of performing demodulation at the receiving side without substantially deteriorating BER characteristics, regardless of carrier frequency error existing among plural wireless communication systems in SDMA of uplink. The wireless communication system includes plural antennas; a MIMO processor that decomposes a reception signal the plural antennas received from plural transmitters into transmission signals transmitted from the respective transmitters; a FFT processor that carries out OFDM demodulation; and a demapping unit that obtains data from signals which were previously converted into sub-carrier signals by the FFT processor, in which the MIMO processor is installed ahead of the FFT processor for sake of the processing sequence of a receive signal, and even though a carrier frequency offset exists in the reception signal MIMO processing is performed prior to OFDM demodulation to split the reception signal from plural transmitters.
    • 公开了无论在上行链路的SDMA中的多个无线通信系统中存在的载波频率误差如何,都能够在接收侧进行解调而不使BER特性实质恶化的无线通信系统。 无线通信系统包括多个天线; 将从多个发射机接收的多个天线的接收信号分解为从各个发射机发射的传输信号的MIMO处理器; 执行OFDM解调的FFT处理器; 以及解映射单元,其通过FFT处理器从先前被转换为子载波信号的信号获得数据,其中为处理接收信号的处理顺序而将MIMO处理器安装在FFT处理器之前,并且即使 载波频率偏移存在于接收信号中,在OFDM解调之前执行MIMO处理,以分割来自多个发射机的接收信号。
    • 5. 发明申请
    • WIRELESS DATA COMMUNICATION SYSTEM, WIRELESS DATA COMMUNICATION METHOD AND COMMUNICATION APPARATUS
    • 无线数据通信系统,无线数据通信方法和通信装置
    • US20070081450A1
    • 2007-04-12
    • US11493821
    • 2006-07-27
    • Shigenori HayaseShinji MuraiTomoaki Ishifuji
    • Shigenori HayaseShinji MuraiTomoaki Ishifuji
    • H04J11/00
    • H04B7/0617
    • A wireless communication system has no limitation in the number of AP antennas and UT antennas, and determines the parallel-communication data units to be a maximum value of MIMO communication, such that it provides a MIMO-SDMA wireless data communication system having superior transmission characteristics. The MIMO-SDMA wireless data communication system includes a single AP (Access Point) and U UTs (User Terminals) communicating with the AP using the same frequency signal at the same time. The UT includes the SDMA reception (Rx) processor, and synthesizes Rx signals of antennas, such that it controls the number of Rx data units. By the control of the number of Rx data units, the communication system controls the number of parallel-communication data units to be equal to a maximum value capable of being implemented by the MIMO-SDMA wireless data communication. The AP informs the UTs of a coefficient matrix required for the SDMA Rx process, prior to transmitting actual data.
    • 无线通信系统对AP天线和UT天线的数量没有限制,并且将并行通信数据单元确定为MIMO通信的最大值,使得其提供具有优异传输特性的MIMO-SDMA无线数据通信系统 。 MIMO-SDMA无线数据通信系统包括使用相同频率信号同时与AP通信的单个AP(接入点)和U UT(用户终端)。 UT包括SDMA接收(Rx)处理器,并且合成天线的Rx信号,使得它控制Rx数据单元的数量。 通过控制Rx数据单元的数量,通信系统将并行通信数据单元的数量控制为能够通过MIMO-SDMA无线数据通信实现的最大值。 在发送实际数据之前,AP向UT通知SDMA Rx进程所需的系数矩阵。
    • 6. 发明授权
    • Wireless data communication system, wireless data communication method and communication apparatus
    • 无线数据通信系统,无线数据通信方式和通信装置
    • US07209765B1
    • 2007-04-24
    • US11493821
    • 2006-07-27
    • Shigenori HayaseShinji MuraiTomoaki Ishifuji
    • Shigenori HayaseShinji MuraiTomoaki Ishifuji
    • H04Q7/20
    • H04B7/0617
    • A wireless communication system has no limitation in the number of AP antennas and UT antennas, and determines the parallel-communication data units to be a maximum value of MIMO communication, such that it provides a MIMO-SDMA wireless data communication system having superior transmission characteristics. The MIMO-SDMA wireless data communication system includes a single AP (Access Point) and U UTs (User Terminals) communicating with the AP using the same frequency signal at the same time. The UT includes the SDMA reception (Rx) processor, and synthesizes Rx signals of antennas, such that it controls the number of Rx data units. By the control of the number of Rx data units, the communication system controls the number of parallel-communication data units to be equal to a maximum value capable of being implemented by the MIMO-SDMA wireless data communication. The AP informs the UTs of a coefficient matrix required for the SDMA Rx process, prior to transmitting actual data.
    • 无线通信系统对AP天线和UT天线的数量没有限制,并且将并行通信数据单元确定为MIMO通信的最大值,使得其提供具有优异传输特性的MIMO-SDMA无线数据通信系统 。 MIMO-SDMA无线数据通信系统包括使用相同频率信号同时与AP通信的单个AP(接入点)和U UT(用户终端)。 UT包括SDMA接收(Rx)处理器,并且合成天线的Rx信号,使得它控制Rx数据单元的数量。 通过控制Rx数据单元的数量,通信系统将并行通信数据单元的数量控制为能够通过MIMO-SDMA无线数据通信实现的最大值。 在发送实际数据之前,AP向UT通知SDMA Rx进程所需的系数矩阵。