Reciprocity loss compensation method of 2*2 TDD-MIMO system channel

A compensation method and reciprocity technology, applied in transmission systems, digital transmission systems, baseband system components, etc., can solve problems such as precoding operation deviation, system performance damage, and inherent advantages of channel reciprocity that cannot be used
CN101873281AInactive Publication Date: 2010-10-27XIDIAN UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
XIDIAN UNIV
Publication Date
2010-10-27
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention discloses a reciprocity loss compensation method of a 2*2 TDD-MIMO system channel, which mainly solves the problem of channel reciprocity loss caused by in-phase / orthogonal I / Q imbalance in a TDD-MIMO system. In the method, a base station BS and a mobile station MS first measure respectively received direction channels to obtain channel state information CSI of an uplink and a downlink; then converging the CSI of the two links to the BS, and the BS calculates the calibration matrixes respectively used for the BS and the MS; sending the calibration matrix used by the MS to the MS; and when in formal data transmission, the BS and the MS use the respective calibration matrixes to pre-process signals to be sent so as to maintain the channel reciprocity of the uplink and the downlink. The method has the advantages of easiness, good effect and little spending of the system, and is applicable in compensating for the loss of the TDD-MIMO system channel caused by I / Q imbalance.
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Description

technical field

[0001] The invention belongs to the technical field of communication, and relates to link compensation, in particular to a compensation method for the problem of loss of channel reciprocity caused by I / Q imbalance in a 2Γ—2 TDD-MIMO system, which is applied to existing I / Q unbalanced 2Γ—2 TDD-MIMO mobile communication system. Background technique:

[0002] Transceivers based on direct conversion structures have received extensive attention in recent years. Compared with the traditional superheterodyne structure, the direct conversion structure omits the link of intermediate frequency processing, and directly realizes the mutual conversion of baseband signals and radio frequency signals, which has significantly improved in terms of volume, power consumption and integration, so it has become a communication A development direction of equipment design. But there are also some problems with the direct conversion structure, one of which is I / Q imbalance. Since b...

Claims

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