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    • 84. 发明授权
    • System and method for subliminal time domain duplexing
    • 用于潜意识时域双工的系统和方法
    • US07711109B2
    • 2010-05-04
    • US11417627
    • 2006-05-04
    • William L. BettsGordon F. BremerRafael S. Martinez
    • William L. BettsGordon F. BremerRafael S. Martinez
    • H04M9/00H04M1/76H04M7/00
    • H04L5/1484
    • The present invention provides methods and apparatus for transmitting a data-bearing signal and a non-data-bearing signal. One embodiment comprises communicatively coupling a data-bearing signal during a first time period and communicatively coupling a non-data-bearing signal during a second time period. The data-bearing signal has a first PSD. The non-data-bearing signal has a second PSD substantially the same as the first over a range of frequencies. The non-data-bearing signal has characteristics facilitating echo cancellation. Another embodiment comprises a line interface and a transmitter coupled to the line interface, comprising a data encoder and a periodic signal generator. The encoder is configured to produce a data-bearing signal with a first PSD. The periodic signal generator is configured to produce a non-data-bearing signal with a second PSD. The second PSD is substantially the same as the first PSD over a first range of frequencies. The non-data-bearing signal has characteristics facilitating echo cancellation.
    • 本发明提供了发送数据承载信号和非数据承载信号的方法和装置。 一个实施例包括在第一时间段期间通信地耦合数据承载信号,并且在第二时间段期间可通信地耦合非数据承载信号。 数据承载信号具有第一PSD。 非数据承载信号具有与频率范围上的第一PSD基本相同的第二PSD。 非数据承载信号具有促进回声消除的特征。 另一个实施例包括线路接口和耦合到线路接口的发射机,包括数据编码器和周期信号发生器。 编码器被配置为产生具有第一PSD的数据承载信号。 周期信号发生器被配置为产生具有第二PSD的非数据承载信号。 第二PSD在第一频率范围上基本上与第一PSD相同。 非数据承载信号具有促进回声消除的特征。
    • 86. 发明授权
    • Discrete multitone interleaver
    • 离散多音交织器
    • US07099401B2
    • 2006-08-29
    • US09736353
    • 2000-12-14
    • William L. Betts
    • William L. Betts
    • H04L27/04H04L27/12H04L27/20
    • H04L27/2601H04L5/143
    • A discrete multitone interleaver system, including an interleaver and deinterleaver, are provided for efficiently communicating data despite noise affecting a Discrete Multitone modulation (DMT) system. The discrete multitone interleaver includes a convolutional encoder capable of receiving a plurality of bits on tones and capable of outputting a convolutionally encoded plurality of bits and a synchronized dual skipping switch capable of passing the plurality of bits on tones to the convolutional encoder in a non-sequential order and capable of outputting the convolutionally encoded plurality of bits in the same non-sequential order. The discrete multitone deinterleaver includes a convolutional decoder capable of receiving a plurality of bits on tones and capable of outputting convolutionally decoded bits and a synchronized dual skipping switch capable of passing the bits to the convolutional decoder in a non-sequential order and capable of outputting the convolutionally decoded plurality of bits in the same non-sequential order.
    • 提供了包括交织器和去交织器的离散多音频交织器系统,用于尽管影响离散多音调制(DMT)系统的噪声而有效地传送数据。 离散多音频交织器包括卷积编码器,其能够接收音调上的多个比特并且能够输出卷积编码的多个比特和同步的双跳跃交换机,其能够以非线性方式将音调上的多个比特传递到卷积编码器, 并且能够以相同的非顺序顺序输出卷积编码的多个比特。 离散多音频解交织器包括卷积解码器,其能够接收音调上的多个位并且能够输出卷积解码的比特和能够以不连续的顺序将比特传递到卷积解码器的能够输出卷积解码比特的同步双跳转交换 以相同的非顺序顺序对多个比特进行卷积解码。
    • 88. 发明授权
    • Space diversity trellis interleaver system and method
    • 空间分集网格交织器系统及方法
    • US07054377B1
    • 2006-05-30
    • US09534696
    • 2000-03-24
    • William L. Betts
    • William L. Betts
    • H04L5/12
    • H04L1/0054H04L1/0041H04L1/0059H04L1/006H04L1/0071H04L1/06H04L1/0625H04L1/0631H04L1/065H04L5/023H04L27/2608H04L27/3416
    • Several embodiments of a space diversity trellis interleaver system are provided for communicating data over a plurality of separate communication paths in order to inhibit distortion caused by impulse noise or other correlated noise and enhance the data transmission rate of data communications. The transmitter is designed to receive a plurality of data streams from data terminal equipment (DTE), which can be one or more devices. One or more convolutional encoders, preferably trellis encoders, encode each of the data streams. In an alternative embodiment, more than one trellis encoder is used to trellis encode each data stream. Data segments from the convolutionally encoded data streams are interleaved with a switch. The plurality of interleaved convolutionally encoded data streams are modulated and transmitted onto a respective plurality of separate communication paths. At the receiver, the plurality of data streams is received from the separate communication paths and demodulated. The data segments are de-interleaved with a switch, and then the de-interleaved data streams are convolutionally decoded with convolutional decoders, preferably trellis decoders. The de-interleaved convolutionally decoded data streams are communicated to one or more DTEs.
    • 提供空间分集网格交织器系统的若干实施例用于在多个单独的通信路径上传送数据,以便抑制由脉冲噪声或其他相关噪声引起的失真并增强数据通信的数据传输速率。 发射机被设计为从数据终端设备(DTE)接收多个数据流,数据终端设备(DTE)可以是一个或多个设备。 一个或多个卷积编码器,优选格栅编码器,对每个数据流进行编码。 在替代实施例中,使用多于一个网格编码器对每个数据流进行网格编码。 来自卷积编码数据流的数据段与交换机交错。 多个交织的卷积编码数据流被调制并发送到相应的多个单独的通信路径上。 在接收机处,从单独的通信路径接收多个数据流并进行解调。 数据段与交换机进行解交织,然后使用卷积解码器,优选网格解码器对解交织的数据流进行卷积解码。 解交织的卷积解码的数据流被传送到一个或多个DTE。
    • 89. 发明授权
    • Embedded signal constellations
    • 嵌入式信号星座
    • US06891896B1
    • 2005-05-10
    • US09769591
    • 2001-01-25
    • William L. Betts
    • William L. Betts
    • H04L5/12H04L23/02H04L27/34
    • H04L27/3488
    • The invention enables a communication device to efficiently communicate large circular signal constellations by embedding a square signal constellation in each of the circular signal constellation points. By embedding a square signal constellation in the error free slicing region associated with each circular constellation signal point, the beneficial shape of the circular constellation is retained while significantly increasing the amount of information that can be transmitted in each constellation. The invention allows the communication of high bit-per-symbol signal constellations (on the order of 15 or more bits-per-symbol) without the added cost of external memory for large look-up tables or the cost and power consumption of line drivers required to communicate high peak factor square signal constellations.
    • 本发明使得通信装置能够通过在每个圆形信号星座点中嵌入一个方形信号星座来有效地传送大的圆形信号星座。 通过在与每个圆形星座信号点相关联的无差错切片区域中嵌入平方信号星座,保留圆形星座的有益形状,同时显着增加可在每个星座中传输的信息量。 本发明允许高符号信号星座(大于15个或更多位符号)的通信,而不需要用于大型查找表的外部存储器的额外成本或线路驱动器的成本和功耗 需要传达高峰因子方波信号星座。
    • 90. 发明授权
    • Linear block interleaver system and method
    • 线性块交织器系统和方法
    • US06668023B1
    • 2003-12-23
    • US09073103
    • 1998-05-05
    • William L. Betts
    • William L. Betts
    • H04B1500
    • H04L1/0071H04L27/2602
    • A digital subscriber line (DSL) communication device employs a linear block interleaver for mathematically combining multiple symbols from a signaling constellation into n-symbol combinations in order to efficiently suppress or eliminate impulse noise generated in the communication channel. In architecture the linear block interleaver includes logic configured to combine multiple symbols from a signaling constellation into n-symbol combinations. The multiple symbols are mathematically combined such that noise energy present in at least one of the n-symbol combinations is spread among each of the multiple symbols, thus reducing the energy of the noise on each of the multiple symbols.
    • 数字用户线(DSL)通信设备采用线性块交织器,用于将来自信令星座的多个符号数学地组合成n符号组合,以便有效地抑制或消除通信信道中产生的脉冲噪声。 在架构中,线性块交织器包括被配置为将来自信令星座的多个符号组合成n符号组合的逻辑。 多个符号被数学地组合,使得存在于n个符号组合中的至少一个中的噪声能量在多个符号中的每一个之间扩展,从而减少了多个符号中的每一个上的噪声能量。