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    • 8. 发明申请
    • Power amplifier with distortion compensation circuit
    • 具有失真补偿电路的功率放大器
    • US20080094139A1
    • 2008-04-24
    • US12000616
    • 2007-12-14
    • Takeshi TakanoYasuyuki OishiToru Maniwa
    • Takeshi TakanoYasuyuki OishiToru Maniwa
    • H03F1/26
    • H03F1/3247H03F1/30H03F1/3282H03F2201/3209H03F2201/3212H03F2201/3224H03F2201/3233
    • A power amplifier negates a memory effect and is applied a linearizer using a digital predistortion system even in an inexpensive device. The power amplifier compares an input signal power against a sampled component of an output power, and provides predistortion to the input signal power so as to minimize a difference as a result of the comparison. The power amplifier comprises a gain lookup table storing a gain coefficient value corresponding to a temperature address determined for an input power; a phase lookup table storing a phase coefficient value corresponding to the temperature address determined for the input power; a transversal filter, which is input with the input power, and which outputs the temperature address; and a coefficient multiplier modulating the input signal using a gain coefficient value and a phase coefficient value, which correspond to the temperature address and which are read out from the gain coefficient lookup table and the phase lookup table.
    • 功率放大器消除了记忆效应,并且即使在廉价的设备中也使用数字预失真系统应用线性化。 功率放大器将输入信号功率与输出功率的采样分量进行比较,并且为输入信号功率提供预失真,以便作为比较的结果使差异最小化。 功率放大器包括:增益查找表,其存储对应于为输入功率确定的温度地址的增益系数值; 相位查找表,存储与为输入功率确定的温度地址对应的相位系数值; 横向滤波器,其输入有输入功率,并输出温度地址; 以及系数乘法器,其使用与所述温度地址对应并且从所述增益系数查找表和所述相位查找表读出的增益系数值和相位系数值来调制所述输入信号。
    • 9. 发明授权
    • Distortion compensating apparatus
    • 失真补偿装置
    • US07012969B2
    • 2006-03-14
    • US09737196
    • 2000-12-14
    • Takayoshi OdeYasuyuki OishiTokuro KuboKazuo NagataniHajime HamadaHiroyoshi Ishikawa
    • Takayoshi OdeYasuyuki OishiTokuro KuboKazuo NagataniHajime HamadaHiroyoshi Ishikawa
    • H04L25/03
    • H03F1/3247H03F2201/3233
    • Disclosed is a distortion compensating apparatus for correcting the size of a distortion compensation coefficient in such a manner that a transmit signal that has undergone distortion compensation will not exceed the dynamic range of a DA converter. Specifically, before a distortion compensation coefficient hn+1(p) that has been calculated by a calculation unit is stored in a coefficient memory, an assumption is made that distortion compensation will be performed using the distortion compensation coefficient hn+1(p). Then it is determined beforehand whether a signal x(t)*hn+1(p) that will be obtained by this distortion compensation will exceed the limit of a DA converter. If the limit will be exceeded, the size of the distortion compensation coefficient is reduced by a correction unit, the corrected distortion compensation coefficient is stored in the memory and the transmit signal is corrected using the stored distortion compensation coefficient.
    • 公开了一种失真补偿装置,用于以经过失真补偿的发送信号不会超过DA转换器的动态范围的方式校正失真补偿系数的大小。 具体地说,在由计算单元计算出的失真补偿系数h N + 1(p)被存储在系数存储器中之前,假定将使用失真补偿执行失真补偿 系数h n + 1(p)。 然后,预先确定将通过该失真补偿获得的信号x(t)* h N + 1(p)将超过DA转换器的极限。 如果超过极限,则通过校正单元来减小失真补偿系数的大小,将校正的失真补偿系数存储在存储器中,并使用所存储的失真补偿系数校正发送信号。
    • 10. 发明授权
    • Distortion compensating apparatus
    • 失真补偿装置
    • US06836517B2
    • 2004-12-28
    • US09745948
    • 2000-12-22
    • Kazuo NagataniTokuro KuboTakayoshi OdeYasuyuki Oishi
    • Kazuo NagataniTokuro KuboTakayoshi OdeYasuyuki Oishi
    • H04K102
    • H04L27/368H03F1/3247H03F1/3288
    • A distortion compensating apparatus for compensating for a distortion of a transmission power amplifier. A delay time decision unit calculates the correlation between a transmission signal and a feedback signal fed back from the output side of the transmission power amplifier while varying phase difference between both signals, and decides the total delay time caused in the transmission power amplifier and a feedback loop on the basis of the phase difference in which the correlation is the maximum. A delay unit delays the transmission signal before a distortion compensation processing by the total delay time, and inputs the delayed signal into a distortion compensating apparatus arithmetic unit, which calculates and stores a distortion compensation coefficient on the basis of the transmission signal and the feedback signal fed back from the output side of the transmission power amplifier. A pre-distortion unit applies a distortion compensation processing to the transmission signal by using the distortion compensation coefficient.
    • 一种用于补偿发射功率放大器的失真的失真补偿装置。 延迟时间决定单元计算发送信号与从发送功率放大器的输出侧反馈的反馈信号之间的相关性,同时改变两个信号之间的相位差,并且确定在发送功率放大器中引起的总延迟时间和反馈 基于相关性最大的相位差进行循环。 延迟单元将失真补偿处理之前的发送信号延迟总延迟时间,并将延迟信号输入失真补偿装置运算单元,该运算单元基于发送信号和反馈信号计算并存储失真补偿系数 从发射功率放大器的输出侧反馈。 预失真单元通过使用失真补偿系数对发送信号应用失真补偿处理。