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    • 24. 发明授权
    • Upstream adaptive modulation in a communications system
    • 通信系统中的上行自适应调制
    • US07860041B2
    • 2010-12-28
    • US12219504
    • 2008-07-23
    • Mark DaleDavid L. HartmanDorothy D. LinRocco J. Brescia, Jr.Alan GinRavi BhaskaranJen-chieh ChienAdel Fanous
    • Mark DaleDavid L. HartmanDorothy D. LinRocco J. Brescia, Jr.Alan GinRavi BhaskaranJen-chieh ChienAdel Fanous
    • H04B7/185
    • H04B7/18513
    • A system and method for providing upstream adaptive modulation. Burst parameters associated with a range of data interval usage codes (IUCs) are defined. Each of the data IUCs has a different modulation order and forward error correction (FEC). The SNR and codeword error rate for each satellite modem in the network are monitored. The data IUCs are dynamically assigned to different satellite modems within an upstream channel based on SNR and/or codeword error rate to enable each of the satellite modems in the upstream channel to achieve maximum bandwidth efficiency during upstream data transmissions. Bandwidth requests are received from the satellite modems and granted. The grant includes the assigned data IUC. The data bursts received in the upstream channel are each processed using the parameters from the assigned IUC for each of the satellite modems sending data in the upstream channel. When any of the satellite modems' SNR and/or codeword error rate changes, the data IUC for that satellite modem is changed accordingly.
    • 一种用于提供上行自适应调制的系统和方法。 定义与数据间隔使用代码(IUC)的范围相关联的突发参数。 每个数据IUC具有不同的调制阶数和前向纠错(FEC)。 监测网络中每个卫星调制解调器的SNR和码字错误率。 基于SNR和/或码字错误率,数据IUC被动态地分配给上游信道内的不同卫星调制解调器,以使上游信道中的每个卫星调制解调器能够在上行数据传输期间实现最大带宽效率。 带宽请求从卫星调制解调器接收并被授权。 授权包括分配的数据IUC。 在上游信道中接收的数据突发信号都使用来自所分配的IUC的参数来处理,每个卫星调制解调器在上行信道中发送数据。 当任何卫星调制解调器的SNR和/或码字错误率改变时,该卫星调制解调器的数据IUC相应地改变。
    • 27. 发明授权
    • Digital receiver using a concatenated decoder with error and erasure
correction
    • 数字接收机使用带有错误和擦除校正的级联解码器
    • US5812603A
    • 1998-09-22
    • US701632
    • 1996-08-22
    • Daniel A. LuthiRavi BhaskaranDojun RheeAdvait M. Mogre
    • Daniel A. LuthiRavi BhaskaranDojun RheeAdvait M. Mogre
    • H04L1/00H04L25/34
    • H04L1/0057H04L1/0045H04L1/0065H04L1/0071
    • A communications receiver system is presented for detecting burst errors and providing erasure information to the block decoder, thereby effectively doubling the conventional correction capability of the block decoder with only a minimal increase in complexity. In one embodiment, this mechanism takes the form of a circuit which re-encodes the output of the inner decoder, compares it with the received sequence of code symbols, and flags a portion of the inner decoder output for erasure when an excessive number of code symbol errors are detected. In a second embodiment, this mechanism takes the form of a circuit which makes hard symbol decisions on the channel signal, compares the hard decisions to the channel signal to determine a noise level, and thereafter flags the channel output in regions with excessive noise levels.
    • 提出了一种用于检测突发错误并向块解码器提供擦除信息的通信接收机系统,从而以仅复杂度的最小增加有效地加倍了块解码器的传统校正能力。 在一个实施例中,该机制采用电路的形式,其对内部解码器的输出进行重新编码,将其与所接收的代码符号序列进行比较,并且当过多数量的代码标记内部解码器输出的一部分以进行擦除 检测到符号错误。 在第二实施例中,该机制采用对信道信号进行硬符号决定的电路的形式,将硬判决与信道信号进行比较以确定噪声电平,此后在具有过高噪声电平的区域中标记信道输出。