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    • 11. 发明授权
    • Predistortion technique for high power amplifiers
    • 大功率放大器的预失真技术
    • US06600792B2
    • 2003-07-29
    • US09105532
    • 1998-06-26
    • Franklin P. AntonioWalid HamdyNitin KasturiChristopher C. RiddleDavid P. Oses
    • Franklin P. AntonioWalid HamdyNitin KasturiChristopher C. RiddleDavid P. Oses
    • H04L2549
    • H03F1/3247H03F1/3241H03F2201/3233
    • A predistortion technique for high power amplifiers includes an adaptive predistortion algorithm that operates independently of data samples to write a set of complex gain values, or predistortion parameters, to a lookup table. The algorithm may be processor-driven. The gain values are taken from the lookup table and multiplied by a complex digital baseband waveform. The gain values may first be subjected to interpolation. The downconverted output of the amplifier is measured to gauge the efficacy of the predistortion. Based on the effect of the predistortion upon the ratio of in-band power to out-of-band power, decisions are made on the set of predistortion parameters for the next iteration of the algorithm. The algorithm runs continuously, perturbing parameters and adapting the predistortion functions accordingly in an effort to continually reflect instantaneous amplitude-modulation and phase-modulation relationships that may change over time with temperature variation or component aging.
    • 用于高功率放大器的预失真技术包括自适应预失真算法,其独立于数据样本操作以将一组复增益值或预失真参数写入查找表。 算法可能是处理器驱动的。 增益值取自查表,并乘以复数数字基带波形。 增益值可以首先进行插值。 测量放大器的下变频输出以测量预失真的功效。 基于预失真对带内功率与带外功率之比的影响,决定了该算法下一次迭代的预失真参数集。 该算法连续运行,扰动参数并相应地调整预失真函数,以努力连续反映随着温度变化或分量老化而随时间变化的瞬时幅度调制和相位调制关系。
    • 12. 发明授权
    • Method and apparatus for using frame energy metrics to improve rate determination
    • 使用帧能量度量来提高速率确定的方法和装置
    • US06389067B1
    • 2002-05-14
    • US09329777
    • 1999-06-10
    • Christopher C. RiddleJeffrey A. Levin
    • Christopher C. RiddleJeffrey A. Levin
    • H04B1700
    • H04L25/0262
    • A Wireless Code Division Multiple Access method and apparatus for determining the transmitted rate of a voice/data signal from a mobile station to a Base Station. Variable rate vocoders transmit voice at one of several predetermined frame rates. The receiver determines the transmitted rate based on one of several frame parameters. One of the parameters is received frame energy. The received frame energy is measured over the length of the relevant portion of the frame. Energy is measured over the half of the frame that can only contain energy if a full rate frame is sent. If the energy measured exceeds a threshold, then full rate is indicated. Else, energy is measured over the fourth of a frame that can only contain energy if a half rate frame is sent. If the energy exceeds a threshold, then half rate is indicated. The procedure is repeated for quarter and eighth rates.
    • 一种用于确定从移动台到基站的语音/数据信号的传输速率的无线码分多址方法和装置。 可变速率声码器以几个预定帧速率之一发送语音。 接收机基于几个帧参数之一确定传输速率。 其中一个参数是接收帧能量。 在帧的相关部分的长度上测量所接收的帧能量。 如果发送全速率帧,则在帧的一半上测量能量,其仅能够包含能量。 如果测量的能量超过阈值,则表示全速率。 否则,如果发送半速率帧,则在帧的四分之一处测量能量,其仅能够包含能量。 如果能量超过阈值,则表示半速率。 对于第四季度和第八季度,重复该过程。