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Power allocation method and device in multi-user MIMO (Multiple Input Multiple Output) system

A power distribution matrix and multi-user technology, applied in power management, energy-saving ICT, electrical components, etc., can solve problems such as error, system performance degradation, and insufficient consideration of base station noise enhancement

Active Publication Date: 2011-01-19
BEIJING STARPOINT TECH COMPANY
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Problems solved by technology

The prior art adopts the simplest equal power allocation (Equal Power Allocation, EPA) method in the downlink, although it is simple, the performance is limited; in the uplink, the Maximum Signal Noise Ratio (Maximum Signal Noise Ratio, MSNR) method is adopted. ) power allocation method, which does not fully consider the noise enhancement problem at the base station
[0010] All the above methods assume that the base station perfectly knows the CSI of each user, but in the actual system, the channel estimation of the user will bring errors, so if this error is not considered, the system performance will be degraded

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Embodiment Construction

[0032] The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are illustrated. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention.

[0033] The purpose of the present invention is to minimize the BER of the system. The MMSE reverse water injection power allocation method based on the BD precoding method can be directly adopted, but the power allocation method is difficult to implement due to the design limitation and complexity of the BD method itself. There are two power allocation methods for SVD-assisted multi-user MIMO uplink and downlink transmission. The downlink uses the EPA power allocation method, ignoring the BER performance gap of each sub-channel, and does not make full use of the transmission power; the uplink uses the MSNR power a...

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Abstract

The invention discloses a power allocation method and a device in a multi-user MIMO (Multiple Input Multiple Output) system, wherein the method comprises the steps of: receiving a radio-frequency signal X; carrying out decoded operation of r=WX on the received radio-frequency signalsX by using a decoding matrix W, and carrying out singular value decomposition on each estimated user channel matrix; calculating signal to interface plus noise ratio (SINR) of each data stream in each user by using the signal r=W[HMAz+n] after decoding, and calculating corresponding bit error rate (BER) on the basis of the calculated SINR; and obtaining a power allocation matrix A which makes the average BER of the system the least under the limitation of the total power of the system. The invention considers the influences of the evaluated errors of a channel to the performance of the system both in the processes of decoding operation and the bit error rate calculation, thereby being more suitable for theapplication to practical systems.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular, to a power allocation method and device in a multi-user MIMO system. Background technique [0002] Multi-antenna (Multiple-Input and Multiple-Output, MIMO) technology: By increasing the number of transmitting antennas and receiving antennas, MIMO technology forms multiple channels for parallel transmission between the two ends of the transceiver, and uses these channels for parallel transmission of data. Improve system spectrum utilization. Compared with the single-antenna system, the introduction of MIMO technology improves the effectiveness and reliability of the system at the same time. The specific embodiment of effectiveness is the spatial multiplexing technology, which can simultaneously transmit multiple data streams in parallel without increasing the frequency spectrum, significantly improving the system's spectrum efficiency and capacity. Transmit ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/34H04W52/42
CPCY02B60/50
Inventor 常鹏飞吕铁军
Owner BEIJING STARPOINT TECH COMPANY
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