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Power distribution method, system and sending terminal

An allocation method and technology at the transmitting end, applied in the field of signal processing, can solve the problem that the distributed MIMO-OFDM system does not give power allocation, and achieve the effect of improving system performance

Inactive Publication Date: 2008-11-05
HUAWEI TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The prior art provides a power allocation method for a centralized MIMO-OFDM system, but no relevant solutions for power allocation have been given for a distributed MIMO-OFDM system

Method used

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  • Power distribution method, system and sending terminal
  • Power distribution method, system and sending terminal
  • Power distribution method, system and sending terminal

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Embodiment Construction

[0026] Since in an OFDM system using a fixed modulation scheme, the bit error rate is mainly determined by some subcarriers experiencing the most severe fading, therefore, when the total transmission power of the system remains unchanged, increasing the signal-to-noise ratio (SNR) is relatively The performance of the system can be effectively improved by reducing the power of a small subcarrier while reducing the power of a subcarrier with a large SNR. Therefore, in the embodiment of the present invention, according to the channel and noise estimation information of the receiving end, the transmitting end allocates power to the signals on each subcarrier to be sent to the receiving end, so that the SNR of each subcarrier is maximized and tends to be consistent.

[0027] The following gives the derivation process of how to obtain the power allocation vector of each sub-carrier under the condition that the total transmission power of the system remains unchanged and the SNR of ea...

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Abstract

The invention discloses a power distribution method, including: determining that each sub-carrier can obtain power gain with maximum signal-noise ratio at the receiving terminal according to the channel estimate value and noise estimate value of each sub-carrier, and determining the power distribution vectors of each sub-carrier according to the power gain; the sending terminal executing emissionpower distribution to each sub-carrier according to the power distribution vectors. The invention simultaneously discloses a sending terminal, including a power gain calculation module and a power calculation distribution module. The invention also discloses a power distribution system, including a sending terminal and a receiving terminal. The invention goes forth from the object of decreasing the influence of the deep fade sub-carrier to the distributed MIMO-OFDM system performance, determines that each sub-carrier can obtain power gain with maximum signal-noise ratio at the receiving terminal according to the channel estimate value and noise estimate value, determines the power distribution vectors of each sub-carrier according to the power gain, realizes the power distribution to the distributed MIMO-OFDM system, and adopts the corresponding process at the receiving terminal and improves the system performance.

Description

technical field [0001] The present invention relates to the technical field of signal processing, in particular to a power allocation method, system and sending end. Background technique [0002] The next generation of mobile communication requires high-capacity and high-quality data transmission, and Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) technology in Multiple-Input Multiple-Output (MIMO, Multiple-Input Multiple-Output) systems has been favored by people. focus on. The multiple receiving and transmitting antennas of the existing centralized MIMO-OFDM system are concentrated in one place, while the multiple receiving and transmitting antennas of the distributed MIMO-OFDM system are respectively distributed in different geographical locations. Compared with the centralized MIMO-OFDM system, the link between each pair of transmitting and receiving antennas of the distributed MIMO-OFDM system is more independent, and has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04B7/26
Inventor 程兴国张少波张帆唐友喜
Owner HUAWEI TECH CO LTD
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