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    • 1. 发明申请
    • Hybrid type channel estimation method and system for mobile environment
    • 混合型信道估计方法和移动环境系统
    • US20050286406A1
    • 2005-12-29
    • US11107969
    • 2005-04-18
    • Won JeonJeong SeoJung WeeDong KimYoun Lee
    • Won JeonJeong SeoJung WeeDong KimYoun Lee
    • H04B7/00H04J11/00H04L1/20
    • H04L1/20H04L1/208H04L25/0228H04L25/0236H04L25/025H04L27/2647
    • Disclosed herein is a hybrid channel estimation method and system for an Orthogonal Frequency Division Multiplexing (OFDM) wireless communication system. The hybrid channel estimation method includes the steps of acquiring a first channel coefficient using decision-directed channel estimation; acquiring a second channel coefficient using pilot-symbol-aided channel estimation; and calculating the final channel coefficient of a received signal by multiplying the first and second coefficients by first and second multiplication coefficients, respectively, and adding the multiplication results. The step of acquiring the first channel coefficient using the decision-directed channel estimation includes the steps of acquiring an initial channel coefficient by processing a long training symbol using a Least Square (LS) method; generating data by equalizing, demodulating and modulating a fast Fourier transformed new symbol using a previously estimated channel coefficient; and acquiring a new channel coefficient by dividing the new symbol by the data.
    • 本文公开了一种用于正交频分复用(OFDM)无线通信系统的混合信道估计方法和系统。 混合信道估计方法包括以下步骤:使用决策信道估计来获取第一信道系数; 使用导频符号辅助信道估计获取第二信道系数; 以及分别通过将第一和第二系数乘以第一和第二乘法系数来计算接收信号的最终信道系数,并且相加乘法结果。 使用决策信道估计获取第一信道系数的步骤包括以下步骤:通过使用最小二乘法(LS)方法处理长训练符号来获取初始信道系数; 通过使用先前估计的信道系数均衡,解调和调制快速傅里叶变换的新符号来产生数据; 并通过将新符号除以数据来获取新的信道系数。
    • 2. 发明申请
    • DIGITAL/ANALOG CONVERTER
    • 数字/模拟转换器
    • US20060284752A1
    • 2006-12-21
    • US11379428
    • 2006-04-20
    • Byung KimWon ChoiYoun LeeChan Park
    • Byung KimWon ChoiYoun LeeChan Park
    • H03M1/66
    • H03M1/682H03M1/765
    • The present invention relates to a digital/analog converter, in which a divided-voltage generating section and a divided-voltage selecting section are added to a conventional digital/analog converter so that a digital signal with high resolution of more than 10 bits can be processed and the size of an IC can be reduced. The digital/analog converter includes a first divided-voltage generating section which divides a reference supply voltage through the voltage distribution; a decoder section which receives a digital signal so as to output a decoded selection signal; a first divided-voltage selecting section which selects and outputs a plurality of divided voltages among the divided voltages generated from the first divided-voltage generating section on the basis of the selection signal output from the decoder section; a second divided-voltage selecting section which selects and outputs a plurality of divided voltages among the divided-voltages output from the first divided-voltage selecting section on the basis of the selection signal output from the decoder section; a second divided-voltage generating section which divides the plurality of divided-voltages output from the second divided-voltage selecting section; a third divided-voltage selecting section which selects a predetermined voltage among the divided-voltages output from the second divided-voltages generating section on the basis of the selection signal output from the decoder; and a voltage output section which outputs the predetermined voltage selected from the third divided-voltage selecting section.
    • 数字/模拟转换器技术领域本发明涉及数字/模拟转换器,其中分压产生部分和分压选择部分被添加到传统的数/模转换器,使得具有大于10位的高分辨率的数字信号可以是 并且可以减小IC的尺寸。 数字/模拟转换器包括:第一分压产生部,其通过电压分配来划分参考电源电压; 解码器部分,其接收数字信号以输出解码的选择信号; 第一分压电压选择部,其根据从解码部输出的选择信号,选择并输出从第一分压产生部生成的分压电压中的多个分压; 第二分压选择部,根据从解码部输出的选择信号,选择并输出从第一分压电压选择部输出的分压电压中的多个分压; 第二分压电压生成部,其对从第二分压电压选择部输出的多个分压进行分压; 第三分压选择部,其根据从解码器输出的选择信号,选择从第二分压产生部输出的分压中的规定电压; 以及电压输出部,输出从第三分压电压选择部选择的预定电压。