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Communication method and apparatus in MIMO system

A multi-output, multi-input technology, applied in multi-frequency code systems, diversity/multi-antenna systems, selection devices, etc., can solve problems that affect spectrum utilization and total transmit power is not effectively used

Inactive Publication Date: 2009-01-07
HUAWEI TECH CO LTD
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Problems solved by technology

This is because the power allocated to each sub-channel is equal to the power allocated to other sub-channels, so usually the allocated power will be slightly greater than the power required by the MCS used by this sub-channel, and the remaining power will be used for Improve the error performance of the system, so the total transmit power is not effectively used, which affects the utilization of the spectrum

Method used

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  • Communication method and apparatus in MIMO system
  • Communication method and apparatus in MIMO system
  • Communication method and apparatus in MIMO system

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Embodiment Construction

[0063] In order to make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the implementation of the present invention in detail in conjunction with the accompanying drawings.

[0064] The first embodiment of the present invention relates to a power allocation method in a MIMO system. In this embodiment, the power required to be increased by each subchannel to support an MCS of one order higher than the current one is compared, and the subchannel requiring the smallest increased power is selected. From the unallocated power, the increased power required by the higher-order MCS of the selected sub-channel is allocated to the sub-channel until the unallocated power is less than the increased power required by the selected sub-channel’s higher-order MCS. The specific process is as follows: figure 2 shown.

[0065] In step 210, an MCS is preliminarily determined for each subchannel according to an equal power alloc...

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Abstract

The invention relates to the wireless communication field and discloses a communication method and a device thereof in a multi-input and multi-output system; the utilization ratio of spectrum can be improved under the same total power by centrally distributing undistributed power to sub channels modulation coding orders of which can be improved most easily. By the optimization for a plurality of times, the undistributed power can be used fully; when the undistributed power can not improve the modulation coding orders of any sub channels, the undistributed power can be evenly distributed to the sub channel of each transmission data so as to further improve the error performance of the system. A codebook is used for feedbacking power distribution vector, which can effectively reduce the feedback amount of information; the use of two codebooks are used at the same time, thus respectively feedbacking the power distribution vector and pre-code matrix and improving the transmission performance of the system under the condition of limited feedback.

Description

technical field [0001] The present invention relates to the field of wireless communication, and in particular to technologies related to power allocation in a Multiple Input Multiple Output (Multiple Input Multiple Output, "MIMO" for short) system. Background technique [0002] At present, more and more attention is paid to the application of MIMO technology in wireless communication systems. Whether it is from the perspective of increasing system capacity or improving system performance, MIMO has its irreplaceable advantages. MIMO is mainly divided into two categories, one is space diversity technology aimed at maximizing diversity gain, and the other is space division multiplexing technology aimed at maximizing data rate. The MIMO system improves the spectrum efficiency and reliability of the wireless link by placing multiple antennas at the transmitting end and the receiving end respectively. Among them, the MIMO system based on space division multiplexing technology tr...

Claims

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Application Information

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IPC IPC(8): H04B7/04H04B7/005H04Q7/38H04L27/26
CPCY02D30/70
Inventor 刘建国杨绿溪罗毅
Owner HUAWEI TECH CO LTD
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