Time-variant TDD-MIMO communication channel reciprocity compensation method based on channel prediction

A channel prediction and communication channel technology, applied in the field of communication, can solve the problems that TDD reciprocity cannot be effectively applied, cannot improve system capacity, and affect system performance, so as to save system overhead, improve system capacity, and reduce complexity.

Inactive Publication Date: 2010-09-15
XIDIAN UNIV
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Problems solved by technology

If this method still uses the outdated uplink channel state information to perform preprocessing at the transmitting end, not only cannot improve the system capacity, but also cause large errors in the receiving end data
In this case, the influence of channel time variation must be considered and compensated, otherwise the reciprocity of TDD will not only not be effectively applied, but will seriously affect the system performance

Method used

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  • Time-variant TDD-MIMO communication channel reciprocity compensation method based on channel prediction
  • Time-variant TDD-MIMO communication channel reciprocity compensation method based on channel prediction
  • Time-variant TDD-MIMO communication channel reciprocity compensation method based on channel prediction

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Embodiment Construction

[0019] refer to figure 2 , the channel reciprocity compensation proposed by the present invention includes the following steps:

[0020] Step 1, the mobile station MS transmits a data frame to the base station BS, and the BS uses the received data frame to perform channel estimation.

[0021] Channel estimation uses the channel estimated by the MMSE method as the initial value of tracking. During the period of transmitting data, Kalman filtering or LMS algorithm is used for channel tracking to obtain the i-th (i=0, 1, ..., ∞) corresponding The uplink channel state matrix is ​​H U(-i) .

[0022] Step 2, save the channel state matrix H corresponding to the previous K (1≤K≤3) uplink subframes estimated by the BS U(-i) (i=0, 1, . . . , (K-1)).

[0023] Step 3, BS according to the saved uplink channel matrix H corresponding to each uplink subframe U , use the AR model to predict the downlink channel state matrix of the first downlink subframe adjacent to the uplink subframe w...

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Abstract

The invention discloses a time-variant TDD-MIMO communication channel reciprocity compensation method based on channel prediction, mainly aiming at solving the problem of channel reciprocity loss caused by channel time variation in a TDD-MIMO communication system. The method comprises the steps of: using a base station (BS) for carrying out channel estimation on a subframe of an upstream link, and obtaining channel state information of the subframe of the upstream link; then, according to the obtained channel state information of the subframe of the upstream link, predicting the subsequent channel state information of a subframe of a downstream link; according to the predicted channel state information, using the BS for carrying out recoding treatment on the subsequent subframe of the downstream link, and maintaining the channel reciprocity of the TDD-MIMO and the downstream link. The method does not need feedback, and uses the base station to obtain the channel state information of the downstream link in the TDD-MIMO system, thus reducing the cost of the system, being applicable to compensating channel reciprocity loss in the TDD-MIMO system caused by channel time variation.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to signal reciprocity compensation of a time division duplex TDD-MIMO communication system, in particular to a compensation method for the problem of channel reciprocity loss caused by channel time variation in a TDD-MIMO system , so as to improve the system capacity, it is applied in the TDD-MIMO mobile communication system with time-varying channel. Background technique [0002] The MIMO system will become one of the key technologies of future wireless communication because it can double the capacity of the wireless channel without increasing the spectrum resources and antenna transmission power. In the MIMO downlink, if the channel state information of the transmitting end can be known, the link capacity can be greatly improved. In the traditional frequency division duplex FDD system, the uplink and downlink work at different frequency points. In order to obtain the downlink...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L25/03H04B7/04
Inventor 刘祖军王凯蓉王杰令易克初田红心肖国军王映民
Owner XIDIAN UNIV
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