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Method for jointly estimating the integral multiple carrier frequency shift and accurate symbol timing

A timing offset, joint time-frequency technology, applied in the direction of multi-frequency code systems, etc., can solve the problems of multi-physical resources, processing time, occupation, etc.

Inactive Publication Date: 2015-05-06
SAMSUNG ELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0027] From the above analysis, it can be concluded that the traditional integer multiple frequency offset estimation and symbol precision timing are two independent processes, which require more physical resources and processing time

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  • Method for jointly estimating the integral multiple carrier frequency shift and accurate symbol timing
  • Method for jointly estimating the integral multiple carrier frequency shift and accurate symbol timing
  • Method for jointly estimating the integral multiple carrier frequency shift and accurate symbol timing

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Embodiment Construction

[0047] The present invention utilizes the frequency domain information in the OFDM system to simultaneously estimate the two time-frequency offsets (that is, the integer frequency offset and the precise timing offset). For DVB and ISDB systems, pilot information in frequency domain can be used; for systems like STiMi, synchronization signals in two frequency domains can be used. The joint cost function proposed by the invention can simultaneously perform integer multiple frequency offset estimation and symbol precise timing estimation. This makes it unnecessary to correct the integer multiple frequency offset in advance when performing symbol precise timing estimation in the receiver.

[0048] It is well known that synchronization is one of the key issues in receivers. Usually for an OFDM system, synchronization often consists of several different stages: for example, frame synchronization or coarse symbol timing, coarse carrier frequency offset estimation, integer multiple f...

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Abstract

The invention relates to a method for jointly estimating the timing and frequency using frequency domain information, which includes the steps that: a first correlation of the received frequency domain information and the locally known frequency domain information is calculated and a second correlation among the first correlation sequences obtained; the amplitudes of the second correlation sequences obtained are calculated, the maximum peak among the amplitudes is detected and the mmax value to which the maximum peak corresponds is used as the estimated integral multiple frequency shift; the timing shift is calculated based on the estimated mmax value corresponding to the integral multiple frequency shift. By applying the method of the invention, the complexity of the timing and frequency estimation is reduced and the time for synchronization is saved.

Description

technical field [0001] The present invention relates to a time and frequency synchronization method in an OFDM (Orthogonal Frequency Division Multiplexing) system (such as a digital video broadcasting system), in particular to a joint video estimation method. Background technique [0002] In most current OFDM systems, such as ISDB-T in Japan and DVB-T in Europe, time-frequency synchronization is a critical and complicated process. The receiver's initial time and coarse frequency acquisition are usually obtained by using the correlation of the cyclic prefix of the OFDM symbol; and then using the pilot information in the frequency domain to estimate the integer carrier frequency offset and the precise timing of the symbol. Among them, the integer frequency offset estimation and precise timing are often two independent processes, usually after the integer multiple frequency offset is estimated and eliminated, the symbol precise timing can be performed, which requires a long syn...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 张乔乔朴范镇魏立军付景兴
Owner SAMSUNG ELECTRONICS CO LTD