Transmission diversity method base on null-frequency encode

A technology of transmit diversity and space-frequency coding, which is applied in the directions of space transmit diversity, multi-frequency code system, diversity/multi-antenna system, etc. The effect of high spectral efficiency

Inactive Publication Date: 2009-03-04
ZTE CORP
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Problems solved by technology

But only when the number of transmitting antennas is 2, the Alamouti scheme can give full play to its advantages, and at the same time meet the two conditions of the coding matrix orthogonality and the coding rate. choose one of the two, and this will degrade the performance of the space-time code

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  • Transmission diversity method base on null-frequency encode
  • Transmission diversity method base on null-frequency encode
  • Transmission diversity method base on null-frequency encode

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[0020] Below in conjunction with accompanying drawing, technical scheme of the present invention will be further described:

[0021] The present invention provides a transmit diversity method based on space-frequency coding. Space-frequency coding combines space-time codes with simple design and convenient decoding with orthogonal frequency-division multiplexing (OFDM) modulation technology, and can make the system more efficient. High spectral efficiency, transmission speed and communication quality. In view of this advantage, SFBC and precoding weight vectors are combined as a diversity method of SFBC+PVS. Considering the objective factors that the stronger the correlation of the channel, the worse the diversity effect, Multiply the two branches of the SFBC diversity with the precoding weight vector to realize the diversity of the four antennas, and use the weight vector to remove the influence on the diversity caused by the tilt angle between the antennas or the correlation ...

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Abstract

The invention discloses a transmission diversity method based on space-frequency coding, which is applicable to an MIMO-OPDM system with a sending antenna which is more than 2. The method takes a combination of the SFBC and pre-coding weighing switching as a diversity mode of SFBC+PVS, taking the objective factor into the account that the stronger the channel correlation is, the weaker the diversity effect is, and uses a weighted vector to remove the effect resulted by the inclination angle between antennae and the channel correlation between different antennae. The method comprises the following steps: step one, two paths of data streams are obtained by carrying out SFBC coding to an input bit stream; step two, two groups of pre-coding weighing vectors are selected; and step three, a coding matrix after pre-coding weighing switching is obtained after the pre-coding weighing vector is adopted to carry out weighing to an SFBC coding data block, and finally an in-time signal obtained by inverse fast Fourier transform is transmitted. By adopting the diversity method, the space diversity effect can be utilized better and the effect on coding gains can be reduced.

Description

technical field [0001] The present invention relates to a diversity technology of a wireless communication system, in particular to a transmit diversity method using a space-frequency coding (Space Frequency Block Coding, SFBC)-based multiple-input multiple-output-orthogonal frequency division multiplexing (MIMO-OFDM) system . Background technique [0002] The next generation of wireless communication systems will provide better voice quality and faster data transfer rates. However, the time-varying multi-path transmission environment, limited bandwidth resources and users' demands on services make it very difficult to realize the above requirements. An effective way to solve these problems is to adopt diversity technology. Diversity technology can be divided into time diversity, frequency diversity and space diversity according to different methods of obtaining independent path signals. As far as time diversity, frequency diversity and space diversity are concerned, in t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04L1/00H04L27/26H04B7/06
Inventor 孙云锋赵琼
Owner ZTE CORP
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