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Transmission diversity method based on null-frequency encode

A space-frequency coding and transmit diversity technology, applied in multi-frequency code systems, through diversity reception to prevent/detect errors, etc., can solve problems such as increasing the bit error rate, punching, and reducing system reliability to prevent data loss. , the effect of improving reliability

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, Alamouti can give full play to its advantages, and at the same time achieve the two effects of encoding matrix orthogonality and encoding rate of 1. Choose one of these two requirements for 1, and this will reduce the performance of the space-frequency code, and more seriously, due to the influence of channel correlation, there will be a hole punching phenomenon, which will reduce the system reliability and increase the bit error Rate

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

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Embodiment Construction

[0020] Suppose the data of a certain user to be transmitted is S=[s 1 ,s 2 ,s 3 ,s 4 ,...,s N ], the number of transmit antennas is 2M (M>1), and the transmit diversity method based on space-frequency coding is as follows figure 1 shown, including the following steps:

[0021] Step 110, the transmitter performs SFBC encoding of the Alamouti scheme on the data after channel encoding and constellation map mapping to obtain two data streams:

[0022] [ S 1 , S 2 , S 3 , S 4 , · · · S N - 1 , S N ] → ...

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Abstract

The invention discloses a transmission diversity method based on space-frequency coding, which can avoid the influence on data by the drilling phenomenon in a data transmission process. In the transmission diversity method, the number of antennae at a transmitting side is set to be 2M, wherein, M is more than 1. The method comprises the steps as follows: (a) two paths of data streams are obtained after the transmitting side carries out space-frequency coding to the data needed to be transmitted; and (b) two groups of data with the same length are extracted from the two paths of data streams each time, each group has M data; after deserialization is carried out on the two groups of data, then distorted space-frequency coding is carried out so as to lead that on the same frequency point, the data transmitted by two antennas has the same amplitude and opposite symbols, the data transmitted by another two antennae has the same amplitude and the same symbol, until the transmitting of the data streams needing to be transmitted are completed.

Description

technical field [0001] The present invention relates to the transmission diversity technology of the wireless communication system, in particular to the transmission diversity design method of the multiple-input multiple-output-orthogonal frequency division multiplexing (MIMO-OFDM) system based on space-frequency block coding (SFBC). 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. The space-time code of the Alamouti scheme has been widely used in MIMO (Multip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04L27/26
Inventor 赵琼王衍文孙云锋段亚军郝东来
Owner ZTE CORP
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