Method and device for switching multi-antenna technologies
A multi-antenna technology and wireless channel technology, which is applied in the field of multi-antenna technology switching, can solve the problems of wasting system resources, cannot reflect channel correlation, and the amount of calculation is large, and achieves the effect of improving system performance.
Active Publication Date: 2015-01-28
ZTE CORP
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Problems solved by technology
Among them, the disadvantage of method 1 is that it cannot be calculated in real time and has a large amount of calculation
Method 2 has higher precision, but the disadvantage is that when no judgment is needed, system resources will be wasted, and the eigenvalue decomposition or singular value decomposition itself has a large amount of calculation
Method 3 Other information is used as discriminant information, and the amount of calculation is small, but it cannot reflect the channel correlation, and errors are inevitable
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[0030] The device for multi-antenna technology switching is used to switch to the mixed transmission mode of multi-antenna technology according to the spatial correlation degree of the autocorrelation matrix of the wireless channel impulse response when using the single transmission mode of multi-antenna technology to transmit data.
[0031] The device can determine the single transmission mode according to the following method: calculate the determinant value of the autocorrelation matrix of the wireless channel impulse response, when the determinant value is greater than or equal to the preset first threshold, use the beamforming mode; the determinant value is less than When the first threshold is preset and is greater than the second preset threshold, the spatial multiplexing mode is used; when the determinant value is less than or equal to the second preset threshold, the transmit diversity mode is used.
[0032]In the beamforming mode, when the device judges that the spati...
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A method and a device for performing switch between multi-antenna technologies are disclosed in the invention. The method includes switching to a mixed transmission mode of multi-antenna technologies according to the spatial correlation degree of an autocorrelation matrix of a wireless channel impulse response when data is transmitted using a single transmission mode of the multi-antenna technologies. With the classification of the single transmission mode and the mixed transmission mode and the realtime switch between them, the invention is able to adaptively select multi-antenna technologies according to realtime channel condition of the system, thereby improving system performance. The precision of discriminating spatial correlation of the switch between Multi-Input Multi-Output (MIMO) modes can be met by performing discrimination twice in the invention, and the adjustment opportunity and precision of the multi-antenna transmission manner is also taken into account. The first discrimination is a rough discrimination which distinguishes scenarios to which the three multi-antenna technologies are fairly applicable; the second discrimination is a precise discrimination which selectably refines the scenarios to which the three multi-antenna technologies are applicable in case the system calculation amount can be afforded, and adaptively switches to the antenna operation mode that meets condition.
Description
technical field [0001] The invention relates to a multiple-input multiple-output system in the field of wireless communication, in particular to a method and device for switching multiple antenna technologies. Background technique [0002] There are many ways to implement the MIMO wireless communication system. Taking the WiMax system as an example, there are multiple multi-antenna technologies such as beamforming, spatial multiplexing, and transmit diversity. Various implementations are aimed at different wireless channel conditions. For example, when the spatial correlation of the wireless channel is low, the system adopts transmit diversity to obtain better transmission performance; when the spatial correlation is high, the system adopts beamforming way to achieve better transmission performance. [0003] The principle of the beamforming method is that the base station obtains a set of effective weights as the weight vectors of the downlink signals of each transmitting a...
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IPC IPC(8): H04B7/06H04B7/04
CPCH04B7/0689H04B7/0691
Inventor 夏冰刘源
Owner ZTE CORP