Layered cooperative transmission implementing method for wireless network

A technology of cooperative transmission and implementation method, which is applied in the direction of transmission system, digital transmission system, prevention/detection of errors through diversity reception, etc. It can solve problems such as difficult to achieve precise synchronization and performance degradation, and achieve improved user performance and large diversity gain , Improve the effect of transmission performance

Inactive Publication Date: 2008-03-05
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0029] Although in the fast-fading wireless channel environment, the above-mentioned space-time coding coordination technical scheme can obtain the diversity gain in space and time at the same time, but this scheme requires that each symbol transmitted by the two mobile terminals A an

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  • Layered cooperative transmission implementing method for wireless network
  • Layered cooperative transmission implementing method for wireless network
  • Layered cooperative transmission implementing method for wireless network

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[0043] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0044] The present invention is a method for implementing layered cooperative transmission in a wireless network. The method adopts a layered modulation technology based on a coding cooperative protocol to cooperatively transmit wireless communication signals in a wireless communication network: when a mobile terminal is When cooperatively sending data from a companion mobile terminal, it does not only send the data of a cooperative user according to the traditional coordination scheme, but uses a layered modulation technology to combine the data symbols of the two low-level modulation (such as QPSK) of itself and the companion mobile terminal Multiplexing together into high-order modulation (such as 16QAM) symbols for coordinated transmission, which can improve th...

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Abstract

Hierarchical modulation technique (HMT) based on code cooperation protocol is adopted in radio communication network to transmit radio signal in cooperation. When transmitting data for associated terminal in cooperation, a mobile terminal multiplexes own and associated data symbols in low order modulation to high order modulation to carry out synergetic transmission. Modulating own data (or data of associated terminal) to bit position in high reliability (or low reliability), the mobile meets QoS requirements of different terminals by adjusting diversity factors of transmission reliability of bit in different positions in HMT. Making compromise between technical implementation and QoS requirement, the method obtains diversity gains in both of space and time so as to improve transmission performance of each terminal effectively. When network can implement synchronization of symbols accurately, the method obtains larger diversity gains by using scheme of combining space with time.

Description

Technical field [0001] The present invention relates to a method for implementing coordinated transmission in a wireless network, specifically, to a method for implementing layered coordinated transmission of wireless signals in which layered modulation technology is applied to a coordinated network, and belongs to the field of wireless communication technology. Background technique [0002] MIMO (Multiple-Input Multiple-Out-put) technology is a technology that uses multiple transmitting antennas and multiple receiving antennas for wireless transmission. Its main feature is to transform the multipath propagation environment into a factor beneficial to users: using MIMO channels to provide The spatial multiplexing gain is used to increase the capacity of the channel, while the spatial diversity gain provided by the MIMO channel is used to effectively eliminate the effects of multipath and time-varying fading of the wireless channel, improve the reliability of signal transmission, ...

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Application Information

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IPC IPC(8): H04L1/06H04L1/00H04L27/34H04L29/06
Inventor 郑侃汪玲王文博
Owner BEIJING UNIV OF POSTS & TELECOMM
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