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System and method for OFDM grouping detection and frequency deviation estimation

A technology of frequency offset estimation and frequency offset correction, which is applied to multi-frequency code systems and other directions, and can solve problems such as subchannel interference and system subcarrier orthogonality destruction

Inactive Publication Date: 2012-11-21
中科集成资产管理(北京)有限责任公司
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Problems solved by technology

[0005] At the same time, there are multiple orthogonal sub-carriers in the OFDM communication system, and its output signal is the superposition of multiple sub-channel signals. Since the sub-channels cover each other, the offset of the carrier frequency will make the orthogonality between the system sub-carriers suffer. to damage, resulting in interference between sub-channels

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  • System and method for OFDM grouping detection and frequency deviation estimation
  • System and method for OFDM grouping detection and frequency deviation estimation
  • System and method for OFDM grouping detection and frequency deviation estimation

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Embodiment Construction

[0058] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0059] The core content of the present invention is to provide a simple, efficient and fast hardware implementation method for OFDM system packet detection and frequency offset estimation by making full use of the knownness of the preamble symbol structure and the design idea of ​​the pipeline structure, which can be used in the corresponding In the time interval between two adjacent data transmissions, only two real multipliers and two real adders are needed to complete the operation of one input data point. After detecting the group, continue to receive nine input data points and perform corresponding operations. The operation can get the frequency deviation value.

[0060] First introduce the realization principle of t...

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Abstract

The invention relating to an OFDM communication technology field discloses a system for packet detection, frequency offset estimation for OFDM communication system comprising a control unit 101, calculating unit 102, packet detection unit 103, frequency offset estimation unit 104 and frequency offset correction unit 105. The invention also discloses a method for packet detection, frequency offsetestimation for OFDM system. The invention provides a simple, highly effective and quick hardware implementing method for packet detection, frequency offset estimation for OFDM system by fully utilizing pilot sign structure and design thought of streamline structure, accurately and effectively detects the packet and estimates frequency offset value on premise of utilizing little resource, and performs frequency offset correction, reduces ICI influence to system performance.

Description

technical field [0001] The present invention relates to the technical field of Orthogonal Frequency Division Multiplexing (OFDM) communication, in particular to a system and method for packet detection and frequency offset estimation in an Orthogonal Frequency Division Multiplexing communication system. Background technique [0002] Orthogonal frequency division multiplexing (OFDM) is a multi-carrier transmission technology, which is characterized by the fact that each sub-carrier is orthogonal to each other, and at the maximum frequency of each sub-carrier, the spectrum values ​​of all other sub-carriers are exactly zero. Therefore, through serial-to-parallel conversion, the high-rate data stream can be converted into a low-rate data stream to modulate the subcarriers, and the spectrum after spread spectrum modulation can overlap with each other, which not only reduces the mutual interference between subcarriers, but also greatly improves the frequency spectrum. utilization...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 刘壹陈杰张浩邱昕亓中瑞
Owner 中科集成资产管理(北京)有限责任公司
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