Transmission method of orthogonal beam shaping in advance based on sending assistant selection of user's feedbacks

A transmission method and beamforming technology, which is applied in the field of orthogonal pre-beamforming transmission based on transmission-assisted selection of user feedback, can solve the problems of heavy, surge of channel state information, etc.

Inactive Publication Date: 2006-02-01
PLA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the increase in the number of antennas causes a surge in the amount of channel state information, making channel state feedback a heavy overhead for the system.

Method used

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  • Transmission method of orthogonal beam shaping in advance based on sending assistant selection of user's feedbacks
  • Transmission method of orthogonal beam shaping in advance based on sending assistant selection of user's feedbacks
  • Transmission method of orthogonal beam shaping in advance based on sending assistant selection of user's feedbacks

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Step 1: Use the following steps to initialize the system:

[0082] a. Determine system user channel correlation matrix R according to channel physical parameters and system parameters, and further determine user channel state matrix H distribution function and H maximum characteristic sub-channel gain distribution function and statistical mean value E[h 2 ],

[0083] b. Calculate the total number of users K in the cell, and calculate the normalized number of users kl=K / N T , N T is the number of transmit antennas,

[0084] c. Set the system user target feedback quantity Kn, which is taken as the transmitting antenna N T 6 to 10 times that of

[0085] d. Given the initial feedback threshold Γ required for the system to start working, let the feedback threshold be E[h 2 ],

[0086] e. Set the pre-beam vector codebook required for constructing the transmitted signal. The method of setting the pre-beam vector codebook is as follows:

[0087] a) The target value of th...

Embodiment 2

[0131] On the basis of multi-user diversity and pre-beamforming, the present invention proposes a simplified user selection method, which avoids joint user signal processing, and at the same time selects user feedback by sending auxiliary strategies, effectively reducing the amount of system feedback information. The present invention The beam vector design and quantization strategy of the multi-user system are given, and the effective transmission of the signal at the sending end is supported by limited feedback.

[0132] The present invention is aimed at following multi-input multi-out system broadcast channel model: the base station has N T transmit antennas, there are K independently distributed users in the system, and each user has N k receiving antennas, the system signal model is:

[0133] y = y 1 M ...

Embodiment 3

[0227] The structural block diagram of the multi-user MIMO system transmission method proposed by the present invention is as follows figure 1 shown. First, the system determines the feedback threshold of the system according to the user feedback information and the number of user target feedbacks, and uses the system broadcast channel to broadcast to all users; Compare the results to decide whether to feed back information; the selected user then selects the optimal pre-beam vector from the vector codebook, together with the maximum sub-channel gain incremental quantization value, and feeds it back to the sending end through a dedicated feedback channel; then, the sending end is in all According to the quasi-orthogonal design method among the users performing feedback, user selection is performed; finally, the transmitting end synthesizes the finally selected user signals and sends them to each user through multiple antennas.

[0228] Consider a typical suburban cellular pro...

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Abstract

First, the system is initialized. Then, according to cycle, the system sends out signal. In current sending cycle, based on feedback threshold in previous sending cycle, the system selects part of users to carry out feedback. User obtaining feedback selects increment code word of channel gain, which is returned back to the sending end through feedback channel. User obtaining feedback selects quantized beam vector in advance. The said vector and increment code word of sub channel gain are returned back to the sending end through feedback channel, based on quasi-orthogonal design method. Selecting out NT number of users from users of giving feedback, the sending end constructs NT pieces of signal for NT number of users, and assembled sending signal for system. In current sending cycle, setting up threshold, the system broadcasts to all users through broadcasting channel in order to select users at next cycle.

Description

technical field [0001] The invention relates to a data transmission method of a wireless network, in particular to an orthogonal pre-beamforming transmission method based on sending auxiliary selection user feedback. Background technique [0002] Multiple-Input Multiple-Output (MIMO) technology can double the capacity and spectrum utilization of wireless communication systems without increasing the bandwidth. It is generally believed that MIMO technology will have practical applications in the next generation cellular network, ad hoc network, wireless local area network and broadband access network. In the 1990s, AT&T Bell laboratory scholars first completed the foundation work of MIMO technology; after that, scholars such as Teladar, Foshinia, and Tarokh successively studied the capacity, signal processing algorithm and space-time code of MIMO systems; in 1998, Wolniansky et al. established a MIMO experimental system using the Vertical-Bell La...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06
Inventor 潘成康蔡跃明徐友云
Owner PLA UNIV OF SCI & TECH
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