Adaptive Channel Prediction and Mitigating Interference in OFDM Systems
    31.
    发明申请
    Adaptive Channel Prediction and Mitigating Interference in OFDM Systems 有权
    OFDM系统中的自适应信道预测和减轻干扰

    公开(公告)号:US20150172088A1

    公开(公告)日:2015-06-18

    申请号:US14133123

    申请日:2013-12-18

    IPC分类号: H04L27/26 H04L25/03

    摘要: One embodiment provides an apparatus. The apparatus includes an optimization module configured to determine a guard interval remainder based, at least in part on a comparison of an allowable microreflection interference level and an actual microreflection interference level; and a windowing module configured to window an OFDM (orthogonal frequency division multiplexed) symbol utilizing the guard interval remainder. The apparatus may further include a channel estimator module configured to determine a predicted channel frequency response based, at least in part, on a probing symbol; and a pre-equalizer module configured to pre-equalize the OFDM symbol based, at least in part, on the predicted channel frequency response.

    摘要翻译: 一个实施例提供了一种装置。 该装置包括:优化模块,其被配置为至少部分地基于允许的微反射干扰电平和实际微反射干扰电平的比较来确定保护间隔余数; 以及窗口模块,被配置为利用所述保护间隔余数来对OFDM(正交频分复用)符号进行窗口化。 该装置还可以包括信道估计器模块,其被配置为至少部分地基于探测符号来确定预测的信道频率响应; 以及预均衡器模块,其被配置为至少部分地基于所预测的信道频率响应来预均衡所述OFDM符号。

    SYSTEMS AND METHODS FOR IMPLEMENTING SOFT-DECISION REED-SOLOMON DECODING TO IMPROVE CABLE MODEM AND CABLE GATEWAY PERFORMANCE
    32.
    发明申请
    SYSTEMS AND METHODS FOR IMPLEMENTING SOFT-DECISION REED-SOLOMON DECODING TO IMPROVE CABLE MODEM AND CABLE GATEWAY PERFORMANCE 有权
    实施软决策解决方案改进电缆调制解调器和电缆网关性能的系统和方法

    公开(公告)号:US20140185657A1

    公开(公告)日:2014-07-03

    申请号:US13728022

    申请日:2012-12-27

    IPC分类号: H04L27/06

    摘要: A system and method are provided for implementing a soft Reed-Solomon (RS) decoding scheme, technique or algorithm to improve physical layer performance in cable modems and cable gateways. At 1024-QAM, a receiver is provided in which a signal to noise ratio is reduced by at least about 1 dB relaxing design considerations and specifications for other components in the system including for the tuner. A soft-RS-symbol generation scheme is provided to enable soft-input RC decoding in a forward error correction (FEC) module connected to a QAM demodulator. The RS decoding scheme is implemented without significantly complicating hardware or processing overhead. A typical receiver hardware requirement in an FEC module to implement the disclosed scheme may be comparatively modest, e.g., on an order of approximately 50K gates.

    摘要翻译: 提供了一种用于实现软的里德 - 所罗门(RS)解码方案,技术或算法以改善电缆调制解调器和电缆网关中的物理层性能的系统和方法。 在1024-QAM中,提供了一种接收机,其中信噪比降低了包括用于调谐器的系统中其他部件的至少约1dB的松弛设计考虑和规格。 提供软RS符号生成方案以在连接到QAM解调器的前向纠错(FEC)模块中实现软输入RC解码。 实现RS解码方案,而不会使硬件或处理开销显着复杂化。 用于实现所公开的方案的FEC模块中的典型接收机硬件要求可以是相对适中的,例如大约50K门的量级。

    Mobile channel estimation for DVB-T COFDM demodulator
    35.
    发明申请
    Mobile channel estimation for DVB-T COFDM demodulator 有权
    DVB-T COFDM解调器的移动信道估计

    公开(公告)号:US20090135923A1

    公开(公告)日:2009-05-28

    申请号:US11986897

    申请日:2007-11-27

    IPC分类号: H04L27/28 H04L27/06

    摘要: A channel estimator for use in a DVB-T system is capable of high Doppler performance without incurring restrictive delay spread limitations, in a hardware efficient manner. A first channel impulse response is generated that has ambiguity due to under-sampling in the frequency domain. A filter is then used to filter scattered pilots to generate a mask that is capable of resolving the ambiguities. In at least one approach, a finite impulse response filter is used during the mask generation process to generate a snapshot of the channel frequency response in non-real time. In another approach, an infinite impulse response filter is used during the mask generation process to generate a channel frequency response in real time.

    摘要翻译: 用于DVB-T系统的信道估计器能够以硬件有效的方式实现高多普勒性能而不产生限制性延迟扩展限制。 产生第一信道脉冲响应,其由于频域中的欠采样而具有模糊性。 然后使用滤波器来过滤散射导频以产生能够解决模糊度的掩码。 在至少一种方法中,在掩模生成处理期间使用有限脉冲响应滤波器以非实时生成信道频率响应的快照。 在另一种方法中,在掩模生成处理期间使用无限脉冲响应滤波器来实时生成信道频率响应。