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    • 10. 发明申请
    • METHOD AND APPARATUS FOR VARYING THE LENGTH OF AN ADAPTIVE EQUALIZER BASED ON DOPPLER FREQUENCY
    • 基于多普勒频率改变自适应均衡器的长度的方法和装置
    • WO03028246A2
    • 2003-04-03
    • PCT/US0230345
    • 2002-09-24
    • QUALCOMM INC
    • SMEE JOHN EFERNANDEZ-CORBATON IVAN JESUSJAYARAMAN SRIKANT
    • H04B7/005H04B3/06H04L25/03H04B7/00
    • H04L25/03038H04L2025/03375H04L2025/03585
    • Systems and methods are described for adjusting the number of taps in an adaptive equalizer as the rate of change of a communications channel varies. The number of taps is adjusted based on an estimate of the Doppler frequency between the devices communicating over a channel. The Doppler frequency reflects the rate of change of the communications channel. Greater Doppler frequencies indicate a more quickly varying channel. It is therefore desirable to change the equalizer length (by adding or dropping taps) based on a measurement of the Doppler frequency. Equalizer length is increased as the Doppler frequency decreases. Conversely, equalizer length is decreased as the Doppler frequency increases. This enables the equalizer to achieve a better compromise between the competing goals of adaptation speed (less taps) and ISI reduction (more taps).
    • 描述了系统和方法,用于随着通信信道的变化率的变化而调整自适应均衡器中的抽头数量。 基于通过信道通信的设备之间的多普勒频率的估计来调节抽头的数量。 多普勒频率反映通信信道的变化率。 更大的多普勒频率表示一个更快速变化的通道。 因此,希望基于多普勒频率的测量来改变均衡器长度(通过添加或删除抽头)。 均衡器长度随着多普勒频率的降低而增加。 相反,均衡器长度随着多普勒频率的增加而减小。 这使得均衡器能够在适应速度(较少的抽头)和ISI减少(更多的抽头)的竞争目标之间实现更好的折中。