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Methods and apparatus for circulation transmissions for OFDM-based MIMO systems

A multi-output, multi-input technology, applied in the field of wireless communication, can solve problems such as reducing system performance

Active Publication Date: 2007-11-28
MICROCHIP TECH INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Unfortunately, this tight arrangement results in highly correlated transmit and receive data streams, degrading system performance

Method used

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  • Methods and apparatus for circulation transmissions for OFDM-based MIMO systems
  • Methods and apparatus for circulation transmissions for OFDM-based MIMO systems
  • Methods and apparatus for circulation transmissions for OFDM-based MIMO systems

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Embodiment Construction

[0026] Although the present invention can be embodied in different forms of embodiments, what is shown in the drawings and described in the following are for understanding the preferred embodiments of the present invention, and please understand that what is disclosed herein is considered as the present invention Is an example and is not intended to limit the present invention to the specific embodiments shown and / or described.

[0027] Proper nouns

[0028] The following explanations will apply to the entire specification:

[0029] L: The number of orthogonal frequency division multitask symbols output from the convolutional code encoder

[0030] N 1 : The number of orthogonal frequency division multitask symbols for each stereo combined interleaver

[0031] N OFDM : The number of orthogonal frequency division multitask symbols transmitted simultaneously

[0032] M: Number of transmission antennas (M≥N OFDM )

[0033] N OFDM (M) System: A simultaneous transmission of N OFDM Signa...

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Abstract

Wireless communication system performance can be improved by adding time, space and frequency diversity. In an OFDM-based MIMO system, each antenna can simultaneously transmit an OFDM symbol. When the number M of antennas is greater than the number N of OFDM symbols to be transmitted simultaneously, the cyclic transmission of the present invention can increase signal diversity (also known as "diversity"). The cyclic transmission includes symbol-based cyclic transmission and subcarrier-based cyclic transmission. In symbol-based cyclic transmission, N antennas are selected from M available antennas according to a cyclic model, and each selected antenna transmits an OFDM symbol at the same time to achieve simultaneous transmission of N The purpose of an OFDM symbol. In the cyclic transmission based on the sub-carrier (Sub-carrier, also known as "sub-carrier"), N OFDM symbols are also processed at a time. According to a cyclic mode, each OFDM The subcarriers in the symbol are re-mapped to one of the M OFDM symbols. The M re-mapped OFDM symbols are simultaneously transmitted by M antennas, and each antenna transmits an OFDM symbol.

Description

Technical field [0001] The present invention relates to a wireless communication, in particular to a multiple input multiple output (MIMO) system cyclic transmission containing a plurality of transmission and reception antennas. Background technique [0002] A multiple-input multiple-output system, which has the advantage of using multiple multiple transmission and receiving antennas to transmit and / or receive multiple data streams at the same time. Therefore, the multiple-input multiple-output system can process the data in the same time. The total rate increases several times. The system function performance of a multiple input multiple output system can be optimized by transmitting Gaussian distributed data streams. The multiple transmitted data streams must be independent and have zero correlation. One way to achieve this independence is to try to use all available diversity when transmitting data streams, namely: frequency, time, and space diversity. Diversity. [0003] Ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B7/06H04L1/06H03M13/27H03M13/23
Inventor 陈政宏金判燮
Owner MICROCHIP TECH INC
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