Orthogonal frequency division multiplex receiving system for symbol timing synchronization and its method

A receiving method and orthogonal frequency division technology, applied in the field of OFDM receiving system, can solve the problems of OFDM receiving system performance degradation, window timing controller uncertain symbol starting point, etc.
CN1396729AInactive Publication Date: 2003-02-12SAMSUNG ELECTRONICS CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
SAMSUNG ELECTRONICS CO LTD
Publication Date
2003-02-12
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

An orthogonal frequency division multiplex (OFDM) receiving system for changing a fast Fourier transform (FFT) window period using a guard interval, and a method for the same are provided. The method includes extracting scattered pilots, which are inserted into a symbol at intervals of predetermined samples, from a received OFDM signal, estimating a symbol timing offset using the extracted scattered pilots and setting a symbol timing synchronization point in the data transmission interval, and adding samples in a predetermined interval in the data transmission interval to samples in an interval obtained by subtracting a predetermined length from the useful symbol interval starting from the symbol timing synchronization point and performing FFT with respect to the result of addition. Accordingly, symbol timing synchronization and channel equalization can be accurately performed without having ISI even when a symbol start point is not correctly decided under a multi-channel (or a Rayleigh channel) or a pre-ghost channel environment.
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Description

technical field

[0001] The present invention relates to an Orthogonal Frequency Division Multiplexing (OFDM) receiving system, in particular to an OFDM receiving system and method for changing the period of a Fast Fourier Transform (FFT) window by using a guard interval. Background technique

[0002] Generally, an OFDM transmission system uses Fast Fourier Transform (FFT) to transmit information via subcarriers, and adds a guard interval to the front of useful symbols in order to reduce the impact of multipath. The OFDM receiving system finds the boundary between the guard interval and the useful symbol interval in the received OFDM signal, and performs FFT window timing synchronization so that FFT is performed only on the useful symbols. For this reason, the OFDM receiving system uses the similarity between the guard interval and useful symbols to roughly calculate the FFT interval.

[0003] figure 1 It is a conceptual diagram of symbol timing sy...

Claims

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