公开(公告)号：US07869551B2

公开(公告)日：2011-01-11

申请号：US11874337

申请日：2007-10-18

Applicant: S Harish Krishnan ,  Parag Naik

Inventor： S Harish Krishnan ,  Parag Naik

IPC: H04L7/00

CPC classification number: H04L27/2662 ,  H04L27/2607 ,  H04L27/2665

Abstract: At a receiver incoming coded OFDM Symbol Data are passed through a Coarse Symbol Timing Synchronization module to determine the approximate start of the symbol. In one embodiment this is accomplished through correlation. The symbol is then passed through an FFT (2K or 8K, depending on the mode desired by the receiver). Since the Coarse Symbol Timing Synchronization module only determines an approximate start point of the symbol, a process of fine synchronization is used to adjust this approximate start point and determine a more accurate start point of the symbol. In this manner, the receiver is enabled to process COFDM symbols in DVB-T transmissions (where the symbols include a cyclic prefix to overcome echoes). One output of an FFT operation is magnitude. Magnitude is used for Channel Estimation (or Channel Correction). Another output of an FFT operation is phase discontinuity or rotations. Phase discontinuities are used in a fine synchronization process to determine the number of phase discontinuities. Phase discontinuity data of the symbol is passed through an N-Point FFT.

Abstract translation: 在接收机输入的OFDM符号数据被传送通过粗符号定时同步模块来确定符号的大致开始。 在一个实施例中，这是通过相关来实现的。 然后，该符号通过FFT（2K或8K，取决于接收机所需的模式）。 由于粗符号定时同步模块仅确定符号的近似开始点，因此使用精细同步的过程来调整该近似起始点并确定符号的更准确的起始点。 以这种方式，接收机能够处理DVB-T传输中的COFDM符号（其中符号包括循环前缀以克服回声）。 FFT运算的一个输出是幅度。 幅度用于信道估计（或信道校正）。 FFT运算的另一个输出是相位不连续或旋转。 相位不连续性用于精细同步过程以确定相位不连续性的数量。 符号的相位不连续数据通过N点FFT。