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Method for modulation diversity joint codes of OFDM system

A technology of joint coding and modulation diversity, which is applied in the field of joint coding and modulation diversity for OFDM systems, can solve problems such as transmission performance deterioration, and achieve the effects of good promotion and application prospects, obvious effects, and simple operation steps.

Inactive Publication Date: 2010-01-06
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

In the BICM algorithm, although the bit interleaving technology increases the time diversity of coded modulation; however, due to the reduction of the minimum Euclidean distance, the transmission performance of the technical solution in the Gaussian channel becomes worse

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  • Method for modulation diversity joint codes of OFDM system
  • Method for modulation diversity joint codes of OFDM system
  • Method for modulation diversity joint codes of OFDM system

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0026] see figure 1 , introduce the specific operation steps of the method for the joint coded modulation diversity of OFDM system in the present invention, it adopts OFDM technology and multi-dimensional rotational modulation technology, obtains the gain of signal diversity by rotating constellation diagram and component interleaving of modulation symbols, and then improves system performance.

[0027] Step 1. The sender initializes the send data: encode and modulate the send data of each user according to the set encoding and modulation methods, and then perform modulation on the symbol vector blocks of all users according to the set rotation angle The in-phase component of the I channel and the quadrature component of the Q channel are subjecte...

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Abstract

The invention relates to a method for the modulation diversity of joint codes of an OFDM system. The method leads signal modulation diversity by modulating the rotation of a constellation picture and interlacing components, dispersedly distributes data prepared to be transmitted to different components by rotation modulation and component interlacement so that the data of the different componentsare respectively decayed on a channel to increase superiorities of signal space diversity, then selects an optical rotation angle to maximally enhance transmission property and also leads OFDM frequency diversity and time-frequency interlacement diversity, thereby more effectively enhancing the property of the system. The invention is improved from a previous invention patent application, i.e. a method for the signal diversity of the OFDM system (application number: 2008102264831) and expands an original diversity technique enhancing and improving the transmission property by two-dimensional rotation modulation to a multi-dimensional rotation modulation technique, thereby well utilizing the modulation diversity to be combined with time diversity and frequency domain diversity to enhance the property of the system.

Description

technical field [0001] The present invention relates to a method for joint coding and modulation diversity in OFDM system, to be precise, relates to a method for comprehensively adopting multi-dimensional rotation modulation, channel coding and diversity to signal in OFDM system, so as to make good comprehensive utilization Time diversity, frequency diversity, modulation diversity and channel coding gain under fading channel to reduce the frame error rate of the system belong to the technical field of diversity in data communication. Background technique [0002] Since Ungerboeck proposed Trellis Code Modulation (TCM) technology in 1982, Coded Modulation (CM) technology has always been a hot research topic in the field of communication. The basic idea of ​​TCM is to comprehensively consider and design the encoder and modulator as a whole, so that the encoded signal sequence generated by the cascaded encoder and modulator has the largest Euclidean distance. Both the current ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L27/38H04L1/06H04L1/00
Inventor 吴湛击王旭郜云萌王文博
Owner BEIJING UNIV OF POSTS & TELECOMM
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