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    • 1. 发明授权
    • Dynamic gain for DAC illumination control
    • DAC照明控制的动态增益
    • US09059877B2
    • 2015-06-16
    • US14167969
    • 2014-01-29
    • QUALCOMM Incorporated
    • Brian James LanglaisJoubin KarimiEhab TahirGregory Allen Magin
    • H04B7/00H04L25/02H03G3/30
    • H04L25/02H03G3/3042
    • A transmitting device may control digital-to-analog converter (DAC) illumination to optimize signal to noise ratio of a transmission signal. DAC illumination may be adjusted based, at least in part, on analog gain and estimated total transmit power of a particular transmission signal. For each destination, total transmit power may be estimated based on tone map, amplitude map, back-off settings, or other characteristics. The estimated total transmit power is used to determine an appropriate analog gain. Once analog gain and total transmit power are known, fine control of SNR may be achieved by adjusting power level in the digital domain. A digital power control setting is used to scale the amplitude of the digital baseband signal prior to DAC operation. The DAC illumination of the digital baseband signal allows the DAC to operate at an optimized power level within the digital range of the DAC.
    • 传输设备可以控制数模转换器(DAC)照明以优化传输信号的信噪比。 可以至少部分地基于特定传输信号的模拟增益和估计总发射功率来调整DAC照明。 对于每个目的地,总发射功率可以基于色调映射,幅度映射,退避设置或其他特性来估计。 估计的总发射功率用于确定适当的模拟增益。 一旦模拟增益和总发射功率已知,则可以通过调整数字域中的功率电平来实现SNR的精细控制。 数字功率控制设置用于在DAC操作之前缩放数字基带信号的幅度。 数字基带信号的DAC照明允许DAC在DAC的数字范围内以优化的功率电平工作。