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Phase compensation method of space-frequency group code in use for overcoming drift of interception position in OFDM

A technology of space-frequency grouping and compensation method, applied in the field of MIMO-OFDM reception, to achieve the effect of increasing complexity and high practical value

Inactive Publication Date: 2007-02-21
TSINGHUA UNIV
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AI Technical Summary

Problems solved by technology

The present invention overcomes the problems caused by the hopping of OFDM symbol interception positions through the phase compensation technology, so that the space-frequency block code can still be decoded normally without increasing the complexity

Method used

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  • Phase compensation method of space-frequency group code in use for overcoming drift of interception position in OFDM
  • Phase compensation method of space-frequency group code in use for overcoming drift of interception position in OFDM
  • Phase compensation method of space-frequency group code in use for overcoming drift of interception position in OFDM

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Embodiment Construction

[0066] Below in conjunction with accompanying drawing and example, the present invention is described in detail:

[0067] In this embodiment, the system has 2 transmitting antennas and 1 receiving antenna, and the system uses SFBC-OFDM technology for communication. frame structure such as figure 1 Shown: Each frame is divided into 10 time slots, numbered 0-9, each time slot takes 0.875ms; each time slot includes 1 time-domain pilot sequence and 8 OFDM symbols; each time-domain pilot sequence includes 16 No power point and 256-point PN sequence can be used for initial time synchronization and frequency synchronization; each OFDM symbol includes 330-point cyclic prefix (CP) and 2408-point data, so each time slot has 19296 sampling points. OFDM symbol 0, as a low-speed physical channel, can be used to transmit low-speed services and signaling, and OFDM symbols 1-7 are used as high-speed physical channels, in which symbols 1 and 5 are inserted with pilots.

[0068] The crystal o...

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Abstract

The invention features the following points; the interception position variation state is used to calculate the rotation bits number; using the channel estimation technology with ration to make channel estimation; the phase compensation is made for the received frequency domain data according the its position in the space frequency block code; finally, the phase-compensated frequency domain data and its corresponding channel estimation value are inputted to the space frequency block coding module. When the interception position has a jump variation, the different phase shift will be generated by different subcarrier wave in same OFDM symbol, and in this case, the invention solves the problem of combining the space frequency block code with the MIMO-OFDM.

Description

technical field [0001] A space-frequency block code phase compensation method for a MIMO-OFDM system belongs to the technical field of MIMO-OFDM reception. Background technique [0002] The MIMO-OFDM system is a multiple-input multiple-output (Multiple-Input Multiple-Output, MIMO) system composed of multiple antennas simultaneously arranged at the receiving end and the transmitting end of the Orthogonal Frequency-Division Multiplexing (OFDM) system. system. Due to the combination of MIMO system's high diversity gain, large system capacity and many characteristics of OFDM system's anti-frequency selective fading and high spectrum utilization, MIMO-OFDM system is used in the new generation of mobile communication (Beyond 3G / 4G) for high capacity and low cost. Driven by the requirements, it is receiving more and more attention. The source information of the sending end is distributed to the OFDM modulation module of each sending antenna through the MIMO sending module, and th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/02
Inventor 周世东高群毅周春晖张秀军王京李云洲
Owner TSINGHUA UNIV
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