会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 43. 发明授权
    • Frame synchronization and detection technique for a digital receiver
    • 数字接收机的帧同步和检测技术
    • US06850582B2
    • 2005-02-01
    • US10392115
    • 2003-03-17
    • Deirdre O'SheaIsmail LakkisSaeid SafaviMasood K. TayebiBaya HatimCathal O'Scolai
    • Deirdre O'SheaIsmail LakkisSaeid SafaviMasood K. TayebiBaya HatimCathal O'Scolai
    • H04J13/00H04W84/14H04L7/00
    • H04W84/14
    • A system and method of frame synchronization and detection for use in a digital receiver within a communication system. The digital radio communication system includes a receiver for receiving a signal stream that includes data frames. Each frame includes an arbitrary data sequence and a unique word. A predetermined number of contiguous bits from the unique word are appended to the beginning of each data frame to identify the start of the data frame. The communication system comprises a sampling circuit for sampling symbol levels, a filter to implement the cross correlation of the received signal with the stored unique word, a threshold detector circuit to detect when frame synchronization is achieved as well as additional circuitry to refine the estimate from the threshold detection circuit. The design utilizes coherent demodulation. However, the design is equally applicable to non-coherent demodulation. In one embodiment, the sampling rate is assumed to be two samples per symbol. However, the functionality of the proposed design is not limited to two samples per symbol.
    • 用于通信系统内的数字接收机中的帧同步和检测的系统和方法。 数字无线电通信系统包括用于接收包括数据帧的信号流的接收机。 每帧包括任意数据序列和唯一字。 来自唯一字的预定数量的连续位被附加到每个数据帧的开头,以标识数据帧的开始。 通信系统包括用于对符号电平进行采样的采样电路,用于实现接收信号与存储的唯一字的互相关的滤波器,用于检测何时实现帧同步的阈值检测器电路以及用于从 阈值检测电路。 该设计采用相干解调。 然而,该设计同样适用于非相干解调。 在一个实施例中,假设采样率是每个符号的两个样本。 然而,所提出的设计的功能不限于每个符号两个样本。
    • 44. 发明授权
    • Joint maximum likelihood frame and timing estimation for a digital receiver
    • 数字接收机的联合最大似然帧和定时估计
    • US06654432B1
    • 2003-11-25
    • US09093414
    • 1998-06-08
    • Deirdre O'SheaIsmail LakkisSaeid SafaviMasood K. Tayebi
    • Deirdre O'SheaIsmail LakkisSaeid SafaviMasood K. Tayebi
    • H04L700
    • H04W84/14H04L7/0029H04L7/042
    • A receiver for receiving a signal stream in a digital radio communication system. The signal stream includes data frames where each frame including a data signal sequence and a synchronizing signal sequence. The communication system synchronizes the receiver by employing the signal stream. The receiver includes a sampling circuit for sampling symbol levels in the synchronizing signal sequence and a synchronization subsystem. The synchronization subsystem utilizes a frame synchronization circuit, a dynamic interpolator and a decision-directed phase tracking mechanism for removing residual frequency and phase offsets. The synchronization subsystem also includes a threshold detection mechanism for comparing values derived from the sampled frame synchronization output with a predefined value which determines whether synchronization has occurred or not. The dynamic interpolator includes a circuit for generating the interpolation coefficients for timing and initial phase estimation, a maximum likelihood timing and phase estimator, and a data interpolation and decimation unit. The estimated timing offset and phase offset in the dynamic interpolator may change for each frame in the signal stream.
    • 一种用于在数字无线电通信系统中接收信号流的接收机。 信号流包括数据帧,其中每帧包括数据信号序列和同步信号序列。 通信系统通过采用信号流来同步接收机。 接收机包括用于对同步信号序列中的符号电平进行采样的采样电路和同步子系统。 同步子系统利用帧同步电路,动态内插器和用于去除残余频率和相位偏移的决策相位跟踪机制。 同步子系统还包括阈值检测机制,用于将从采样帧同步输出得到的值与预定义值进行比较,该预定义值确定是否已发生同步。 动态插值器包括用于产生用于定时和初始相位估计的内插系数的电路,最大似然定时和相位估计器以及数据插值和抽取单元。 动态内插器中的估计的定时偏移和相位偏移可以针对信号流中的每个帧而改变。