Pre-coding matrix selection method and system for closed loop multiple input multiple output system

A precoding matrix, multi-input technology, applied in the field of communication, can solve the problems of no performance gain, small gain, and the theoretical channel capacity cannot be reached, and achieve the effects of increasing gain, increasing throughput, and reducing complexity

Active Publication Date: 2011-09-28
ZTE CORP
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Problems solved by technology

[0005] The minimum trace criterion of the mean square error matrix has little gain compared to the open loop in the case of full rank; the maximum channel capacity criterion does not actually reach the calculated theoretical channel capacity, and the frame error rate (FrameError Rate, FER) performance has no gain ; while the optimal bit error rate selection criterion is equivalent to the maximum throughput criterion, its shortcoming is that its calculation formula is obtained under a large number of assumptions
It can be seen that there are deficiencies in the selection methods of the existing precoding matrix

Method used

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  • Pre-coding matrix selection method and system for closed loop multiple input multiple output system
  • Pre-coding matrix selection method and system for closed loop multiple input multiple output system
  • Pre-coding matrix selection method and system for closed loop multiple input multiple output system

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Embodiment 1

[0040] Such as figure 1 As shown, the closed-loop MIMO system of two receiving and two sending according to an embodiment of the present invention, the number of code streams is 2, and the selection method of the precoding matrix comprises the following steps:

[0041] Step 101, traverse all precoding matrices, and calculate their corresponding CINR values ​​respectively.

[0042] Calculate CINR according to the following formula:

[0043] CINR i = | ( GHW ) ii | 2 Σ j ≠ i | ( GHW ) ij ...

Embodiment 2

[0078] Such as figure 2 As shown, one embodiment of the system for selecting the precoding matrix in the closed-loop MIMO system of the present invention includes a CINR calculation module and an MCS calculation module, and the CINR calculation module is used to traverse all the precoding matrices and calculate their corresponding The value of the carrier-to-interference-noise ratio CINR; the MCS calculation module is used to obtain the modulation and coding mode value MCS according to the value of the corresponding carrier-to-interference-noise ratio CINR, calculate its corresponding spectral efficiency, and select the preset with the largest spectral efficiency encoding matrix.

[0079] In an embodiment of the precoding matrix selection system in the closed-loop MIMO system of the present invention, the MCS calculation module includes a mapping and screening sub-module, a ΔMCS calculation sub-module, a correction sub-module and a selection sub-module, and the mapping and sc...

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Abstract

The invention discloses a pr-coding matrix selection method for a closed loop multiple input multiple output system. The method comprises the following steps of: traversing all pre-coding matrixes, and calculating values of carrier to interference and noise ratios (CINR) corresponding to the pre-coding matrixes respectively; and obtaining modulation and coding scheme (MCS) values according to the values of the CINRs corresponding to the pre-coding matrixes, calculating spectral efficiency corresponding to the MCS values, and selecting the pre-coding matrix with the highest spectral efficiency. When the method is applied to the closed loop multiple input multiple output system, channel quality can be improved, the throughput of a closed loop multiplexing system can be improved, and the gain can be increased.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and system for selecting a precoding matrix in a closed-loop multiple-input multiple-output system. Background technique [0002] Multiple Input Multiple Output (Multiple Input Multiple Output, MIMO) is one of the important technologies for realizing the high data rate required by the wireless data system. Data streams can be transmitted via MIMO to increase system throughput. Currently, most 3G and 4G wireless standards such as World interoperability for Microwave Access (WiMAX), Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) and Long-Term Evolution Technologies (Long Term Evolution, LTE) and the like all adopt the MIMO method. [0003] The transmission scheme of the MIMO system is mainly divided into two types: an open-loop MIMO system and a closed-loop MIMO system. The closed-loop MIMO system feeds back channel information to the transmitter at the rec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06
CPCH04B7/0417H04L1/0009H04B7/0413H04B7/0456H04L1/0003Y02B60/31H04B7/0639Y02D30/50
Inventor 焦丽姚春峰张娟
Owner ZTE CORP
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