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    • 6. 发明授权
    • Radio transmission device
    • 无线传输设备
    • US08416757B2
    • 2013-04-09
    • US13168550
    • 2011-06-24
    • Naoki Okamoto
    • Naoki Okamoto
    • H04B1/38H04J1/00H04J11/00H04J9/00H04L5/04
    • H04L5/006H04B7/0697H04L1/0003H04L5/0007H04L5/0016H04L5/0023H04L5/0026H04L5/0028H04L5/0039H04L5/0046H04L5/0092
    • To obtain maximum throughput in accordance with characteristics of a propagation path, a radio transmission device having a plurality of transmitting antennas (18a, 18b) for transmitting a transmission signal in units of sub-carriers by performing spatial multiplexing or without performing spatial multiplexing is provided that includes a sub-carrier modulation part 11 modulating the input transmission signal for each sub-carrier, a transmission signal allocation part 13 allocating the transmission signal modulated for each of the sub-carriers to each of the transmitting antennas, and a transmission control part 12 that determines a multiplexing number for performing spatial multiplexing for each sub-carrier based on information received from another radio communication device as an opposite party, and outputs the determined multiplexing number to the sub-carrier modulation part and the transmission signal allocation part.
    • 为了根据传播路径的特性获得最大吞吐量,提供了具有多个发送天线(18a,18b)的无线电发送装置,用于通过执行空间复用或不执行空间复用来以子载波为单位发送发送信号 包括对每个子载波调制输入发送信号的子载波调制部分11,将针对每个子载波调制的发送信号分配给每个发送天线的发送信号分配部分13以及发送控制部分 12,根据从作为对方的另一无线通信装置接收到的信息,决定用于对每个子载波进行空间复用的多路复用数,并将所确定的多路复用数输出到副载波调制部和发送信号分配部。
    • 8. 发明授权
    • Low-noise amplifier
    • 低噪声放大器
    • US08395447B2
    • 2013-03-12
    • US13179339
    • 2011-07-08
    • Yusuke NakahashiNaoki Okamoto
    • Yusuke NakahashiNaoki Okamoto
    • H03F3/45
    • H03F1/34H03F3/191H03F2200/108H03F2200/18H03F2200/294H03F2200/492H03F2200/78
    • A low-noise amplifier comprises an input terminal to which a signal is input; a transistor configured to amplify the signal input to the input terminal; an output terminal through which the amplified signal from the transistor is output; a feedback amount regulator circuit configured to regulate an amplitude of the signal output from the transistor as a feedback amount and output a voltage; a bias circuit configured to generate a bias current fed to the transistor; a differential voltage comparator configured to compare the voltage output from the feedback amount regulator circuit to a reference voltage, determine whether or not a level of the signal input to the input terminal is a level at which a gain of the transistor is suppressed, and increase the bias current fed to the transistor when the differential voltage comparator determines that the level of the signal input to the input terminal is the level at which the gain of the transistor is suppressed; a first input bias circuit configured to generate the reference voltage and apply the reference voltage to one input end of the differential voltage comparator; and a second input bias circuit configured to add a bias voltage to the voltage output from the feedback amount regulator circuit and apply the voltage added with the bias voltage to the other input end of the differential voltage comparator.
    • 低噪声放大器包括输入信号的输入端子; 晶体管,被配置为放大输入到所述输入端的信号; 输出来自晶体管的放大信号的输出端子; 反馈量调节电路,被配置为调节从晶体管输出的信号的幅度作为反馈量并输出电压; 偏置电路,被配置为产生馈送到所述晶体管的偏置电流; 差分电压比较器,被配置为将反馈量调节器电路的输出电压与参考电压进行比较,确定输入到输入端子的信号电平是否为抑制晶体管增益的电平,并增加 当差分电压比较器确定输入到输入端的信号的电平是抑制晶体管的增益的电平时馈送到晶体管的偏置电流; 第一输入偏置电路,被配置为产生参考电压并将所述参考电压施加到所述差分电压比较器的一个输入端; 以及第二输入偏置电路,被配置为向所述反馈量调节器电路输出的电压添加偏置电压,并且将与偏置电压相加的电压施加到所述差分电压比较器的另一个输入端。