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    • 47. 发明申请
    • Coarse Frequency Offset Estimation in ISDB Receivers
    • ISDB接收机的粗频偏估计
    • US20090268850A1
    • 2009-10-29
    • US12107998
    • 2008-04-23
    • Yongru GuJun Ma
    • Yongru GuJun Ma
    • H04L27/22
    • H04L27/2675H04L27/2659H04L2027/0034H04L2027/0053H04L2027/0067
    • A method of estimating a coarse frequency offset in a receiver includes providing at least one candidate frequency offset in Orthogonal Frequency-Division Multiplexing (OFDM) symbols having transmission and multiplexing configuration control (TMCC) bins and auxiliary channel (AC) bins, modulating the TMCC bins and AC bins using differential binary phase shift keying (DBPSK) modulation, estimating a phase difference between a first symbol and a second symbol for the candidate frequency offset of the TMCC and AC bins to obtain a resulting phase difference, correcting the resulting phase difference based on a difference between the candidate frequency offset and a Fast Fourier Transform (FFT) center bin to obtain a corrected phase difference, mapping the corrected phase difference to numeric numbers, and adding the numeric numbers for the candidate frequency offset to obtain a summation result. The numeric numbers correspond to at least one of +1 or −1.
    • 一种估计接收机中的粗频偏移的方法,包括在具有传输和复用配置控制(TMCC)机箱和辅助信道(AC)机箱的正交频分复用(OFDM)符号中提供至少一个候选频偏,调制TMCC 使用差分二进制相移键控(DBPSK)调制,估计TMCC和AC信号的候选频率偏移的第一符号和第二符号之间的相位差以获得所得到的相位差,校正所得到的相位差 基于候选频率偏移和快速傅立叶变换(FFT)中心仓之间的差异来获得校正的相位差,将校正的相位差映射到数字,并且将候选频率偏移的数字加上以获得求和结果 。 数字对应于+1或-1中的至少一个。
    • 48. 发明申请
    • Robust FFT Trigger Point Tracking for Echo Channels in OFDM Based Communication Systems
    • 基于OFDM的通信系统中回波信道的鲁棒FFT触发点跟踪
    • US20090262842A1
    • 2009-10-22
    • US12105300
    • 2008-04-18
    • Yongru GuJun Ma
    • Yongru GuJun Ma
    • H04L27/28
    • H04L27/2662H04L27/2676H04L27/2695
    • Identifying a trigger point of at least one OFDM decoder includes correlating a first time-domain sample of the at least one OFDM symbol with a second time-domain sample of the at least one OFDM symbol, processing the first time-domain sample and the second time-domain sample in the first moving average filter to determine a channel impulse response, comparing at least one correlation value of a first biggest path in the channel impulse response and a second biggest path in the channel impulse response, and determining a channel length of the channel impulse response based on a time duration of the channel impulse response. The OFDM decoder includes a first moving average filter and a second moving average filter.
    • 识别至少一个OFDM解码器的触发点包括将至少一个OFDM符号的第一时域样本与至少一个OFDM符号的第二时域样本进行相关,处理第一时域样本和第二时域采样 在第一移动平均滤波器中的时域采样以确定信道脉冲响应,将信道脉冲响应中的第一最大路径的至少一个相关值与信道脉冲响应中的第二最大路径进行比较,以及确定信道脉冲响应的信道长度 基于信道脉冲响应的持续时间的信道脉冲响应。 OFDM解码器包括第一移动平均滤波器和第二移动平均滤波器。
    • 49. 发明授权
    • Low complexity soft-input Viterbi decoding for digital communication systems
    • 用于数字通信系统的低复杂度软输入维特比解码
    • US07599441B2
    • 2009-10-06
    • US11471187
    • 2006-06-20
    • Jun MaNabil Yousef
    • Jun MaNabil Yousef
    • H04L5/12H04L23/02H04L27/06
    • H04L25/067H04L1/0041H04L1/0052H04L1/0054H04L1/006H04L1/0071H04L27/34H04L27/38
    • A DVB-H bit-interleave coded modulation/demodulation system and method includes a convolutional encoder; an interleaver operatively connected to the convolutional encoder; a quadrature amplitude modulation (QAM) mapper operatively connected to the interleaver; a channel component operatively connected to the QAM mapper; a QAM demapper operatively connected to the channel component; a de-interleaver operatively connected to the QAM demapper; and a Viterbi decoder operatively connected to the de-interleaver. Preferably, the interleaver comprises a bit-wise interleaver and a symbol-wise interleaver operatively connected to the bit-wise interleaver. Preferably, the de-interleaver comprises a bit-wise de-interleaver; and a symbol-wise de-interleaver operatively connected to the bit-wise de-interleaver. The de-interleaver may be adapted to decode a soft decision metric for any of a QPSK, 16QAM, and 64QAM modulation. The de-interleaver may be adapted to decode a soft decision metric computation comprising a log-likelihood ratio soft decision metric of a binary bit stream of a signal.
    • DVB-H位交织编码调制/解调系统和方法包括卷积编码器; 可操作地连接到卷积编码器的交织器; 可操作地连接到交织器的正交幅度调制(QAM)映射器; 可操作地连接到QAM映射器的信道分量; 可操作地连接到信道分量的QAM解映射器; 可操作地连接到QAM解映射器的解交织器; 以及可操作地连接到解交织器的维特比解码器。 优选地,交织器包括可操作地连接到逐位交织器的逐位交织器和符号方式的交织器。 优选地,解交织器包括位逐去交织器; 以及可操作地连接到逐位解交织器的符号式解交织器。 解交织器可以适于解码用于QPSK,16QAM和64QAM调制中的任何一个的软判决度量。 解交织器可以适于解码包括信号的二进制比特流的对数似然比软判决度量的软判决度量计算。