Self-adaptive modulation method based on multi-user precode

An adaptive modulation and precoding technology, applied in the direction of link quality-based transmission modification, multiplexing communication, transmission control/equalization, etc., to achieve the effect of improving anti-error performance

Inactive Publication Date: 2006-09-20
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0026] 4. Traditional

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  • Self-adaptive modulation method based on multi-user precode
  • Self-adaptive modulation method based on multi-user precode
  • Self-adaptive modulation method based on multi-user precode

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Embodiment Construction

[0040] The present invention will be described in detail below in the form of embodiments with reference to the accompanying drawings.

[0041] figure 2 A structural diagram of a MIMO system according to an embodiment of the present invention is shown.

[0042] The MIMO system to which the present invention is applied usually includes a base station 10 and multiple user terminals 201-20N. Since the configurations of each terminal are roughly the same, only the user terminal 201 will be described here.

[0043] The base station 10 includes a data source 101 such as a memory storing data of respective users, an AM module 1021-102N, a precoding module 1031 and transmitting antennas 1041-104N. The user terminal 201 includes a receiving antenna 2011 , a channel and noise estimation module 2012 and a demodulation module 2013 . Similarly, the user terminal 20N includes a receiving antenna 201N, a channel and noise estimation module 20N2 and a demodulation module 20N3.

[0044]Fir...

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Abstract

Purpose of the invention is to raise performance of anti- error code in multi-user MIMO system. The method includes steps: base station obtains channel matrix and noise power of each user's terminal; using channel matrix and noise power of each user's terminal and prearranged precoding method calculates equivalent SNR of each user's terminal; determining self adaptive modulation parameter table from equivalent SNR; using water flooding method determines value of power distribution based on equivalent SNR of each user's terminal; calculating new SNR of each user's terminal from noise power and value of power distribution of each user's terminal, and determining corresponding mode of modulation from the self adaptive modulation parameter table based on new SNR; redistributing power for users' terminals in same modulation mode according to mode in same SNR so as to obtain final distributed power for each user's terminal, sending data from antenna based on final distributed power and mode.

Description

technical field [0001] The invention relates to a precoding-based adaptive modulation method and equipment in a multi-user MIMO wireless communication system, which are used to improve the anti-error performance of the MIMO system. Background technique [0002] Multiple Input Multiple Output (MIMO) technology is a major breakthrough in the field of wireless mobile communication. MIMO technology refers to the use of multiple antennas for data transmission and reception. Studies have shown that the use of MIMO technology can increase the capacity of the channel, but also improve the reliability of the channel and reduce the bit error rate. MIMO technology has great potential for improving the capacity of wireless communication systems, and is a key technology adopted by the new generation of mobile communication systems. Multi-user MIMO communication is one of the current research hotspots. [0003] Figure 7 Shown is a schematic structural diagram of a commonly used single...

Claims

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Application Information

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IPC IPC(8): H04B14/04H04B7/005H04B7/04H04J99/00
CPCH04L1/0016H04L2025/03808H04L1/0003H04L25/03343
Inventor 吴强李继峰
Owner PANASONIC CORP
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