公开(公告)号：US20070211641A1

公开(公告)日：2007-09-13

申请号：US11374550

申请日：2006-03-13

Applicant: Dengwei Fu ,  Sujai Chari ,  Mohan Karnam

Inventor： Dengwei Fu ,  Sujai Chari ,  Mohan Karnam

IPC: H04L12/26 ,  H04J3/14 ,  H04J1/16 ,  H04L1/00 ,  H04J11/00

CPC classification number: H04L27/2647 ,  H04B1/71637 ,  H04L1/0001 ,  H04L1/203

Abstract: A method and apparatus of predicting link quality of a link is disclosed. The method includes receiving multi-carrier modulated signals over a period of time, estimating an SNR for each received sub-carrier, constructing a sequence of the SNRs, and estimating link PER based upon knowledge of encoding and/or interleaving used during transmission, and the sequence of SNRs.

Abstract translation: 公开了一种预测链路链路质量的方法和装置。 该方法包括在一段时间内接收多载波调制信号，估计每个接收到的子载波的SNR，构造SNR的序列，以及基于在传输期间使用的编码和/或交织的知识来估计链路PER，以及 SNR序列。

公开(公告)号：US06874006B1

公开(公告)日：2005-03-29

申请号：US09698249

申请日：2000-10-30

Applicant: Dengwei Fu ,  Alan N. Willson, Jr.

Inventor： Dengwei Fu ,  Alan N. Willson, Jr.

IPC: G06F7/38 ,  G06F17/10 ,  H04L27/22

CPC classification number: H04L27/22

Abstract: A rectangular-to-polar-converter receives a complex input signal (having X0 and Y0 components) and determines an angle φ that represents the position of the complex signal in the complex plane. The rectangular-to polar-converter determines a coarse angle φ1 and a fine angle φ2, where φ=φ1+φ2. The coarse angle φ1 is obtained using a small arctangent table and a reciprocal table. These tables provide just enough precision such that the remaining fine angle φ2 is small enough to approximately equal its tangent value. Therefore the fine angle φ2 can be obtained without a look-up table, and the fine angle computations are consolidated into a few small multipliers, given a precision requirement. Applications of the rectangular-to-polar converter include symbol and carrier synchronization, including symbol synchronization for bursty transmissions of packet data systems. Other applications include any application requiring the rectangular-to-polar conversion of a complex input signal.

Abstract translation: 矩形到极性转换器接收复数输入信号（具有X0和Y0分量）并且确定表示复平面中的复信号的位置的角度phi。 矩形到极化转换器确定粗角度phi1和精细角度phi2，其中phi = phi1 + phi2。 使用小的反正切表和倒数表获得粗角度phi1。 这些表提供足够的精度，使得剩余的细角度phi2足够小以近似等于其切线值。 因此，在没有查找表的情况下可以获得细角度phi2，并且在精度要求下，将精细角度计算合并到几个小乘数中。 矩形到极化转换器的应用包括符号和载波同步，包括分组数据系统的突发传输的符号同步。 其他应用包括需要复合输入信号的矩形到极化转换的任何应用。

公开(公告)号：US06628707B2

公开(公告)日：2003-09-30

申请号：US09849687

申请日：2001-05-04

Applicant: Manouchehr S. Rafie ,  Jun Lu ,  Dengwei Fu ,  Tushar Shah

Inventor： Manouchehr S. Rafie ,  Jun Lu ,  Dengwei Fu ,  Tushar Shah

IPC: H03H740

CPC classification number: H04L25/03038 ,  H04L2025/03477 ,  H04L2025/03668

Abstract: A method for an adaptive equalization apparatus in a multiple-link hopping radio system includes hopping among a plurality of radio links to receive variable-length bursts of radio signals on the plurality of radio links and equalizing amplitude and phase variations of a slow channel for each radio link from a received burst on the radio link. Further, the method includes storing the estimated tap coefficients pertinent to each radio link and using the tap weights of the current burst of the radio link to reliably pre-compensate the channel amplitude and phase distortion of a next received burst on the radio link.