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Unitary space time coding scheme based on Gram-Schmidt orthogonalization procedure

A coding scheme, unitary space-time technique, applied in the direction of error prevention/detection through diversity reception, etc.

Inactive Publication Date: 2009-08-12
SOUTHEAST UNIV
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Problems solved by technology

Another reason is that in order to ensure that the designed codeword satisfies the orthogonality, a real orthogonal design with a number of transmitting antennas of 4 has to be used, while an orthogonal design with a code rate of 1 and a number of transmitting days of 4 is limited to real orthogonality. design

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  • Unitary space time coding scheme based on Gram-Schmidt orthogonalization procedure
  • Unitary space time coding scheme based on Gram-Schmidt orthogonalization procedure
  • Unitary space time coding scheme based on Gram-Schmidt orthogonalization procedure

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Embodiment Construction

[0069] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0070] (1) Build a system model: build a MIMO system model with 4 launch days according to the first subsection of the technical solution of the present invention, such as figure 1 shown. The input data is first space-time encoded to generate M outputs. The M symbols are modulated into parallel radio frequency band-pass signals, which are sent through M antennas. The transmitted signal passes through the wireless channel, undergoes fading, and reaches the receiving antenna. The signal plus noise is received by N antennas, matched filtered, sampled, and N outputs are generated, followed by space-time decoding to restore the original data. (2) Determine system parameters: the number of transmitting antennas is four, and the number of receiving antennas is one or more. For the symbols in (9), the QPSK rotation constellation is used, that is, the symbol...

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Abstract

The invention discloses a unitary space-time coding proposal based on a Gram-Schmidt orthogonalization process. The proposal comprises: a first steps of acquiring a coding structure with high coding rate by cascading a plurality of quasi-orthogonal blocks behind a prior code; a second step of acquiring full diversity gain by the constellation rotation of the coding structure of the first step; and a third steps of subjecting the coding structure acquired in the second step to the Gram-Schmidt orthogonalization process for the mutual orthogonalization of transmission vectors of the constructed coding structures in different transmission antennae to acquire unitary space-time codes. The unitary space-time coding proposal does not need channel evaluation for decoding, and can sufficiently use related time of the channel to improve the coding rate of the codes and acquire the full diversity gain.

Description

technical field [0001] The invention relates to a unitary space-time coding scheme based on a Gram-Schmidt orthogonalization process. Background technique [0002] Entering the 21st century, the rapid development of wireless mobile terminal users proves the importance of wireless communication. The information society we live on is undergoing changes, and the progress of wireless technology and the improvement of people's needs are the main driving forces of the information society change. With the continuous development of various wireless communication services and broadband data services, wireless resources, especially spectrum resources, are becoming more and more scarce. How to use these limited communication resources more efficiently has become the focus of wireless communication technology development. Studies have shown that the MIMO (Multiple-input Multiple-output) technology using multiple antennas can make full use of space resources, and can effectively resist ...

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Application Information

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IPC IPC(8): H04L1/06
Inventor 郭永亮尤肖虎潘志文
Owner SOUTHEAST UNIV
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