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    • 15. 发明申请
    • Design Methodology and Method and Apparatus for Signaling with Capacity Optimized Constellations
    • 用容量优化星座进行信令的设计方法与方法与装置
    • US20130083862A1
    • 2013-04-04
    • US13618630
    • 2012-09-14
    • Maged F. BarsoumChristopher R. Jones
    • Maged F. BarsoumChristopher R. Jones
    • H04B15/00
    • H04W24/02H04B15/00H04L1/0003H04L1/0009H04L27/3405H04L27/3483
    • Communication systems are described that use geometrically shaped constellations that have increased capacity compared to conventional constellations operating within a similar SNR band. In several embodiments, the geometrically shaped is optimized based upon a capacity measure such as parallel decoding capacity or joint capacity. In many embodiments, a capacity optimized geometrically shaped constellation can be used to replace a conventional constellation as part of a firmware upgrade to transmitters and receivers within a communication system. In a number of embodiments, the geometrically shaped constellation is optimized for an Additive White Gaussian Noise channel or a fading channel. In numerous embodiments, the communication uses adaptive rate encoding and the location of points within the geometrically shaped constellation changes as the code rate changes.
    • 描述了与在类似SNR频带内操作的常规星座相比,使用具有增加的容量的几何形状星座的通信系统。 在几个实施例中,基于诸如并行解码容量或联合容量的容量测量来优化几何形状。 在许多实施例中,可以使用容量优化的几何形状的星座来代替传统的星座作为固件升级到通信系统内的发射机和接收机的一部分。 在多个实施例中,针对加性高斯白噪声信道或衰落信道对几何形状的星座进行了优化。 在许多实施例中,通信使用自适应速率编码和几何形状星座中的点的位置随着码率的变化而改变。
    • 17. 发明授权
    • Methodology and method and apparatus for signaling with capacity optimized constellations
    • 具有容量优化星座的信令的方法和方法和装置
    • US07978777B2
    • 2011-07-12
    • US12156989
    • 2008-06-05
    • Maged F. BarsoumChristopher R. Jones
    • Maged F. BarsoumChristopher R. Jones
    • H04L5/12
    • H04W24/02H04B15/00H04L1/0003H04L1/0009H04L27/3405H04L27/3483
    • Communication systems having transmitter, includes a coder configured to receive user bits and output encoded bits at an expanded output encoded bit rate, a mapper configured to map encoded bits to symbols in a symbol constellation, a modulator configured to generate a signal for transmission via the communication channel using symbols generated by the mapper. In addition, the receiver includes a demodulator configured to demodulate the received signal via the communication channel, a demapper configured to estimate likelihoods from the demodulated signal, a decoder that is configured to estimate decoded bits from the likelihoods generated by the demapper. Furthermore, the symbol constellation is a capacity optimized geometrically spaced symbol constellation that provides a given capacity at a reduced signal-to-noise ratio compared to a signal constellation that maximizes dmin.
    • 具有发射机的通信系统包括:编码器,被配置为以扩展的输出编码比特率接收用户比特并输出编码比特;映射器,被配置为将编码的比特映射到符号星座图中的符号;调制器,被配置为产生经由 通信通道使用由映射器生成的符号。 此外,接收机包括被配置为经由通信信道解调接收信号的解调器,被配置为从解调信号估计似然性的解映射器,被配置为从由解映射器生成的似然值估计解码比特的解码器。 此外,符号星座是容量优化的几何间隔的符号星座,与最大化dmin的信号星座相比,以降低的信噪比提供给定容量。
    • 18. 发明授权
    • Viterbi slicer for turbo codes
    • 涡轮代码维特比切片机
    • US07848466B2
    • 2010-12-07
    • US12358362
    • 2009-01-23
    • Steven T. JaffeKelly B. CameronChristopher R. Jones
    • Steven T. JaffeKelly B. CameronChristopher R. Jones
    • H04L27/06
    • H04L1/0066H04L1/005H04L1/0054H04L2027/0028H04L2027/0055
    • A method for synchronizing receivers that receive turbo encoded signals to a received signal. Turbo encoding may enable signals to be decoded at a much lower signal to noise ratio than previously practical. A traditional method of synchronizing a receiver to an incoming signal is to use a slicer to determine a received symbol and then to compare the determined symbol to the incoming waveform, in order to adjust the phase of the slicer with respect to the incoming signal. At signal low levels, at which turbo encoded signals may be decoded, this slicing method may be prone to errors that may disrupt the synchronization of the receiver to the incoming signal. By replacing the slicer by a Viterbi decoder with zero traceback (i.e., one which does not consider future values of the signal only past values) a prediction as to what the incoming signal is can be made. Because the Viterbi decoder can consider past signal values it can predict the present symbol being received with higher reliability than by using a slicer, which considers only the present value of the incoming signal.
    • 一种用于将接收turbo编码信号的接收机同步到接收信号的方法。 Turbo编码可以使信号以比以前实际的低得多的信噪比进行解码。 将接收机同步到传入信号的传统方法是使用限幅器来确定接收到的符号,然后将确定的符号与输入波形进行比较,以便相对于输入信号调节限幅器的相位。 在信号低电平处,可以对Turbo编码信号进行解码,该分片方法可能容易出现可能中断接收机与输入信号的同步的错误。 通过用零回溯的维特比解码器(即,不将信号的未来值仅仅考虑过去的值)来替换限幅器,可以对可以进行什么输入信号进行预测。 因为维特比解码器可以考虑过去的信号值,所以它可以比使用仅考虑输入信号的当前值的限幅器更可靠地预测接收到的当前码元。