Codebook selection and modulation method being applied under MIMO-OFDM system to overcome weak scattering

A technology of MIMO-OFDM and modulation method, which is applied in transmission system, baseband system, multi-frequency code system, etc., and can solve problems such as limited anti-fading and anti-jamming performance

Inactive Publication Date: 2011-03-09
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

In the case of BICM, although bit interleaving modulation increases the time diversity of coding and modulation, its anti-fading and

Method used

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  • Codebook selection and modulation method being applied under MIMO-OFDM system to overcome weak scattering
  • Codebook selection and modulation method being applied under MIMO-OFDM system to overcome weak scattering
  • Codebook selection and modulation method being applied under MIMO-OFDM system to overcome weak scattering

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Embodiment Construction

[0096] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0097] The present invention is a joint design method of precoding codebook selection and rotational modulation based on MIMO-OFDM system. The method diffuses and distributes the transmitted data to different components through rotational modulation, so that the data of different components are respectively in the channel In order to increase the advantages of signal space diversity, and then select the optimal rotation angle to obtain the maximum performance improvement; at the same time, introduce MIMO space diversity, time diversity, OFDM frequency diversity, and time-frequency interleaving diversity to achieve joint coding The gain brought by modulation diversity effectively improves system performance.

[0098] see figure 1 , introducing the codebook selection modulation method applied to the MIMO-OFDM system to overcome weak scattering, the metho...

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Abstract

The invention provides a precoding codebook selection and rotation modulation joint design method based on an MIMO-OFDM system, which comprises the steps of diffusing and distributing transmitted data onto different components through rotation modulation, leading the data of the different components to realize independent fading on respective signal channels so as to increase the advantages of signal space diversity, and further selecting the optimal rotation angle to obtain the maximum lift of the performances; and simultaneously introducing MIMO space diversity, time diversity and OFDM frequency diversity, as well as time-frequency interleaving diversity, thereby realizing gain caused by joint coding modulation diversity and effectively improving the performances of the system.

Description

technical field [0001] The present invention relates to a modulation method in a digital communication system, in particular to a method suitable for channel conditions of weak scattering and strong correlation, through the combination of multi-antenna codebook precoding and rotational modulation scheme through a new codebook selection criterion, so that The invention relates to a modulation method in which channel coding gain is effectively combined with time diversity, space diversity and modulation diversity for joint optimization. It is a modulation method under a MIMO-OFDM system based on codebook precoding with high efficiency and high spectrum efficiency, and belongs to the field of communication technology. Background technique [0002] With the development of cellular mobile communication, Internet and multimedia services, the demand for capacity of wireless communication in the world is increasing rapidly. On the other hand, the available wireless spectrum is limite...

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Application Information

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IPC IPC(8): H04L1/06H04L27/26
CPCH04L25/03898H04L1/0071H04B7/0456H04L27/2601
Inventor 吴湛击张力岭王文博
Owner BEIJING UNIV OF POSTS & TELECOMM
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