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Method and system for realizing down link self adaption in multiple users multiple input and multiple output system

A downlink, multi-input technology, applied in multi-frequency code systems, diversity/multi-antenna systems, space transmit diversity and other directions, can solve problems such as no progress, and achieve full utilization, improve spectrum utilization efficiency and channel capacity.

Inactive Publication Date: 2007-04-11
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the many technical factors that need to be considered comprehensively, there has not been any substantive progress on how to realize downlink adaptation in a multi-user MIMO system.

Method used

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  • Method and system for realizing down link self adaption in multiple users multiple input and multiple output system
  • Method and system for realizing down link self adaption in multiple users multiple input and multiple output system

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Embodiment Construction

[0081] Figure 1 exemplarily illustrates the multi-user MIMO system involved in the present invention, the "system" described in this embodiment includes a base station and a user set, wherein the user set includes user 1, user 2, ... ..., and user N. Multiple antennas are configured on the base station, and multiple antennas are also configured on each user end. For schematic illustration, only 3 antennas are drawn on the base station side shown in FIG. 1 , and only 2 antennas are drawn on the user side, and these antennas can be used for transmission and reception. By implementing the embodiments of the present invention, link adaptation technology can be used to enable each user in the system to have the most suitable transmission scheme.

[0082] Theoretical research shows that in the Rayleigh fading channel environment, the MIMO system can effectively use multipath information to generate independent parallel channels in space and transmit multiple data streams at the sam...

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Abstract

This invention relates to a method and a system for realizing adaptive down-link in the multi-user multi-in / out system including the following steps: UE measure the channel state of a down-link and feeds it to the base station, which distributes sub-carriers to the UE based on the state information and informs the distribution result to the corresponding UE, which estimates the channel quality of the down channel based on the sub-carrier and feeds back the information to the base station, which selects corresponding emission antennas and modulates each selected antenna adaptively and selects the code mode to distribute and control the emission power.

Description

technical field [0001] The present invention relates to a multiple-input multiple-output (MIMO) wireless communication system, in particular to a method and system for realizing downlink self-adaptation in a multi-user MIMO system. Background technique [0002] In the future broadband wireless communication system, it will mainly face two severe challenges of multipath fading channel and bandwidth efficiency. Moreover, how to improve spectrum utilization and data transmission rate has become one of the key issues facing the next generation wireless communication system. [0003] According to the needs of major operators in the world, it is hoped that the 3GPP long-term evolution wireless communication system will reach a peak rate of 100 Mbps in the downlink, and a peak rate of 50 Mbps in the uplink. To meet this requirement, an effective method is to adopt a multiple-input multiple-output (MIMO) system in which multiple antennas are configured in both the base station and ...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04L27/26H04L1/06
Inventor 蒋小奎张力王衍文
Owner ZTE CORP
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