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Diversity method for MIMO-OFDM system base on null-frequency encode

A space-frequency coding and post-coding technology, which is applied in the direction of space transmit diversity, diversity/multi-antenna system, prevention/detection of errors through diversity reception, etc., can solve the problems that the effects of frequency diversity and time diversity cannot be reflected, etc.

Inactive Publication Date: 2009-03-04
ZTE CORP
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, when the channel between adjacent subcarriers does not change much, the effects of frequency diversity and time diversity cannot be reflected

Method used

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  • Diversity method for MIMO-OFDM system base on null-frequency encode
  • Diversity method for MIMO-OFDM system base on null-frequency encode
  • Diversity method for MIMO-OFDM system base on null-frequency encode

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Embodiment Construction

[0026] This embodiment combines the current design idea based on SFBC diversity, and designs a diversity method suitable for a MIMO-OFDM system with more than 2 transmitting antennas, which can better utilize the effect of frequency diversity.

[0027] In this embodiment, the original data is rearranged in the frequency domain, and SFBC coding is performed on the rearranged data and the original data, so as to achieve the effect of packet SFBC coding when the number of antennas is greater than 2.

[0028] figure 1 It is a schematic diagram of transmitter transmission in the diversity method based on subcarrier rearrangement in this embodiment, assuming that the data of a certain user to be transmitted is S=[s 1 ,s 2 ,...,s k ,...,s N ], where k is any value from 1 to N, and it is assumed that the number of transmitting antennas is N t , in this example N t is an even number. The transmit diversity method is as figure 2 shown, including the following steps:

[0029] St...

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Abstract

The invention discloses a diversifying method of an MIMO-OFDM system based on space-frequency coding, when the transmitting antenna is more than 2, better frequency gain effect can still be obtained. The diversifying method comprises that: after rearranging data in a data packet needed to be transmitted, a transmitting party carries out space-frequency coding to the data and then transmits the data; the rearrangement is used for causing the data transmitted by each antenna on sub-carriers with the same frequency points to be different; when receiving the data, a receiving party carries out de-rearrangement according to the rearrangement manner of the transmitting party after the receiving of all the data packets is finished, and carries out space-frequency decoding after the same user data is obtained on the corresponding sub-carriers so as to obtain the original user data.

Description

technical field [0001] The invention relates to a diversity technology of a wireless communication system, in particular to a diversity method using a space-frequency 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. [0003] The space-time code of the Alamouti scheme has been widely used in MIMO (Multiple Input Multiple Output) systems because of its simple design and convenient decoding. Agrawal et al. proposed a scheme that combines space-time code and Orthogonal Frequency Division Multiplexing (OFDM, Orthogon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04L1/06H04L5/06
Inventor 孙云锋赵琼段亚军王衍文
Owner ZTE CORP
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