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Method for realizing fine timing synchronization estimation of OFDM (Orthogonal Frequency Division Multiplexing) system

A technology of precise timing synchronization and implementation method, applied in the field of communication, can solve the problems of reduced synchronization accuracy and low synchronization accuracy, and achieve the effects of reducing the amount of calculation, reducing the amount of transformation calculation, and accurately and accurately timing synchronization estimation.

Inactive Publication Date: 2011-07-13
SHANGHAI HUAHONG INTEGRATED CIRCUIT
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Problems solved by technology

Usually the coarse timing synchronization algorithm is relatively less affected by frequency offset, but the synchronization accuracy is low
The precise timing synchronization algorithm can achieve high synchronization accuracy, but as the frequency offset increases, the synchronization accuracy decreases sharply

Method used

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  • Method for realizing fine timing synchronization estimation of OFDM (Orthogonal Frequency Division Multiplexing) system
  • Method for realizing fine timing synchronization estimation of OFDM (Orthogonal Frequency Division Multiplexing) system
  • Method for realizing fine timing synchronization estimation of OFDM (Orthogonal Frequency Division Multiplexing) system

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Embodiment Construction

[0021] specific implementation plan

[0022] Below in conjunction with accompanying drawing, the content of the invention provided by the present invention is described in detail:

[0023] (1) The time-domain reception is expressed as r(k), and the maximum correlation (MC) algorithm is used to find the rough position of the time-domain training sequence in the received signal:

[0024] d ML = arg max m ( | { Σ k = m m + N - 1 r ( k ) · r * ( k + N ) } |

[0025] Wherein, N is the length of the training sequence in the time domai...

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Abstract

The invention provides a method for realizing fine timing synchronization estimation of an OFDM (Orthogonal Frequency Division Multiplexing) system. The method comprises the following steps of: seeking for an approximate position of a time domain training sequence in a received signal by using a maximum correlation algorithm and taking the time domain training sequence out; setting an extraction interval and extracting the time domain training sequence of the received signal according to the interval; extracting a local training sequence according to the set interval; transforming the time domain training sequence which is subjected to time extraction into a frequency domain training sequence through FFT (Fast Fourier Transform) according to data length after the time extraction; multiplying the frequency domain training sequence by the extracted shift local training sequence and transforming the frequency domain multiplication result back to a time domain through IFFT (Inverse Fast Fourier Transform); and seeking for each peak value for different shift values, wherein the time position corresponding to the maximum peak value is an estimated fine synchronization numerical value. By adopting the technical solution provided by the invention, large frequency deviation can be confronted and quick and accurate fine timing synchronization estimation can be realized; and meanwhile, operation and hardware realization complexity in a fine synchronization estimation algorithm can be effectively reduced.

Description

technical field [0001] The invention relates to a method for realizing OFDM time synchronization estimation in the communication field, in particular to a method for realizing precise timing synchronization estimation in an OFDM system. Background technique [0002] Time synchronization in Orthogonal Frequency Division Multiplexing ("OFDM") systems is used to provide accurate windowing locations for Fast Fourier Transform ("FFT") demodulation. Since the cyclic prefix guard interval is inserted between OFDM symbols, the start moment of OFDM symbol timing synchronization can be changed within the guard interval without causing intersymbol interference ("ISI" for short) and inter-channel interference ("ICI" for short). "). Only when the FFT operation window exceeds the symbol boundary, or falls into the amplitude roll-off interval of the symbol, will ISI and ICI be caused. Therefore, OFDM systems have relatively loose requirements on symbol timing synchronization. [0003] I...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 李刚
Owner SHANGHAI HUAHONG INTEGRATED CIRCUIT
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