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A method for synchronization in OFDM system

A technology of orthogonal frequency division and frequency adjustment, which is applied in the field of information transmission, can solve problems such as system malfunction, receiver synchronization method and device malfunction, etc., and achieve the effect of avoiding interference

Inactive Publication Date: 2005-11-02
BEIJING SAMSUNG TELECOM R&D CENT +1
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Problems solved by technology

[0027] However, all these design schemes are aimed at the single-cell environment; in the case of multiple cells, if these design schemes are still used, then because each cell uses the same subcarrier, the pilot symbols of different cells will interfere with each other , so the receiver synchronization method and device for these pilot symbol structures may not work properly, which in turn will cause the entire system to not work normally

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  • A method for synchronization in OFDM system
  • A method for synchronization in OFDM system
  • A method for synchronization in OFDM system

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Embodiment Construction

[0046] The present invention adopts a new pilot symbol format, this new pilot symbol contains one or two OFDM symbols, the schematic diagram of symbol formation is as follows figure 2 As shown, if a symbol is included, there is only symbol one.

[0047]This new pilot symbol structure segments (or groups) the subcarriers in the OFDM symbol, and avoids mutual interference by assigning different segments (or groups) to adjacent cells. On the even carrier or odd carrier of two adjacent symbols in the same segment, the differential modulation method is used to transmit the cell characteristic sequence. The cell characteristic sequence may only contain the cell identification code, or may contain the cell identification code and part of the system broadcast information at the same time. Each cell sends pilot symbols of its own cell. Since the energy of the first OFDM symbol in the pilot symbol is concentrated in the segment, and no signal is transmitted in other parts, the transm...

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Abstract

A method for synchronization in orthogonal frequency division multiplexing system comprises steps: sending end transmits induce signal structure contained OFDM signal; receiving end locates the OFDM signal by checking the induce signal. The invention divides the sub carrier wave of OFDM signal, assigns different subsection to different small segment and avoids mutual disturbance, can make user's terminal take normal synchronization process, and discerns different characteristic sequence code of small segment, even can transmit broadcast inside.

Description

technical field [0001] The present invention relates to the field of information transmission in an Orthogonal Frequency Division Multiplexing (hereinafter referred to as OFDM) system, in particular to a method for processing information such as time synchronization and carrier offset in the OFDM system. Background technique [0002] OFDM is a robust communication technique for efficient information transmission in a channel. This technology utilizes multiple parallel sub-carriers (sub-carrier frequencies) that transmit low-rate data to achieve high-data-rate communications. The technical point is to divide the channel transmission bandwidth into several sub-bands, transmit data information in parallel on each sub-band with mutually orthogonal sub-carriers, and use the orthogonality of each sub-carrier at the receiving end to separate out the parallel transmission Data information. [0003] OFDM technology has been successfully applied in many communication systems, for ex...

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Application Information

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IPC IPC(8): H04L27/26
Inventor 仲川曹锋铭郑旭峰蒋海林廖敬一王家城王海赵英权朴东植
Owner BEIJING SAMSUNG TELECOM R&D CENT
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