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Non cooperative virtual MIMO technology

A non-cooperative, technical technology, applied in the direction of space transmit diversity, communication between multiple stations, digital transmission system, etc.

Inactive Publication Date: 2008-02-20
姜永权 +1
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] A pre-processing technology for the downlink signal of the virtual MIMO system is proposed. The technical problem to be solved: In the case of no direct communication capability between MTs, each user cannot use other users' received signals for cooperative processing

Method used

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Experimental program
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Embodiment Construction

[0006] Let M represent the number of co-channel users in the non-cooperative virtual MIMO system, and use N to represent the number of base station antennas. In order to enable the receiving end to effectively separate M co-channel user signals, N≥M is required.

[0007] A search technique for reasonable uplink user combinations in narrowband channels. First estimate the N×M uplink channel matrix H, and calculate the generalized inverse matrix V of the channel matrix H, so that the user combination with the smallest Frobenius norm of V can be the best user combination, and the user combination with the smaller Frobenius norm of V Assembled for reasonable users. According to the ZF criterion, the generalized inverse of H is given by the following algorithm:

[0008] V zf =(H H h) -1 h H (1)

[0009] According to the MMSE criterion, the generalized inverse of H can also be given by the following algorithm:

[0010] V mmse =(H H H+σ 2 I M ) -1 h H (2)

[00...

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Abstract

The utility model discloses a non-cooperative virtual MIMO technology, which belongs to wireless communication field. Reasonable users are chosen to construct co-channel user combination; space-division multiplex of the co-channel users can be realized to increase total system capacity by times without requesting that direction communication ability is arranged between mobile terminals. For an uplink, an uplink co-channel signal can be separated through a minimum quadratic mean deviation algorithm, a zero forcing algorithm, a serial interference elimination algorithm, a maximum likelihood algorithm and other methods. For a downlink, the co-channel interference is obviously restrained for the receiving signal of each user through the downlink signal pretreatment technology; each user can individually receive signal treatment without other user cooperation to greatly simplify the receiver of the users. The non-cooperative virtual MIMO technology can improve total capacity of broadband wireless communication system by times through cooperating with orthogonal frequency division multiplexing technology. The non-cooperative virtual MIMO technology is more particularly suitable for the wireless communication system of division dual.

Description

technical field [0001] The technical field to which the technical solution belongs is the field of wireless communication. Background technique [0002] Multiple-Input Multiple-Output (MIMO) technology has been extensively studied because it can significantly increase communication capacity. However, in general, a portable mobile terminal (MT) cannot be installed with multiple antennas, so that a single-antenna MT and multiple antennas of a base station cannot form a real MIMO system. The virtual MIMO technology proposed in recent years makes use of the cooperation among multiple spatially adjacent MTs to form a MIMO system. However, the cooperative virtual MIMO technology requires that the cooperative MTs must have direct communication capabilities, so there are a series of problems such as information security, system complexity, and difficulty in implementation. [0003] The present invention proposes a non-cooperative virtual MIMO technology, which is characterized in ...

Claims

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Application Information

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IPC IPC(8): H04B7/04H04B7/26H04L27/00
Inventor 姜永权魏月
Owner 姜永权
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