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Method and device for switching transmission mode of MIMO communication system

A technology of transmission mode and communication system, which is applied in the field of transmission mode switching of MIMO communication system to achieve the best performance.

Inactive Publication Date: 2011-04-20
BEIJING UNIV OF POSTS & TELECOMM
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the process of realizing the present invention, the inventors found that the mode switching scheme of space multiplexing and space diversity in the MIMO system in the above-mentioned prior art has at least the following problems: The user who serves the request is not the best solution, because the transmission goal of this type of user is to maximize its transmission rate, not to minimize its transmission symbol error rate
The above switching scheme based on maximizing throughput is still not the best switching scheme for users with real-time service requests

Method used

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  • Method and device for switching transmission mode of MIMO communication system

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Embodiment 1

[0020] The processing flow of a method for switching between spatial multiplexing and spatial diversity modes of a MIMO communication system proposed in this embodiment is as follows figure 1 As shown, the following processing steps are included:

[0021] Step 11. According to the characteristics of the QoS request, users are divided into two categories: users requesting real-time services and users requesting non-real-time services.

[0022] In the downlink transmission of the wireless communication system, the base station has N t transmit antennas, and the user receiver has N r a receiving antenna. A space-time codec block is included at the base station transmitter, which can map the input bit stream to the transmitted symbol vector. At the same time, the transmission channel is regarded as a MIMO channel and satisfies the independent flat Rayleigh fading process. It is assumed that the MIMO channel transmission can be switched between spatial multiplexing mode and spa...

Embodiment 2

[0064] The embodiment of the present invention also provides a transmission mode switching device for a multiple input and output communication system, the structural diagram of the device is as follows figure 2 As shown, the following modules are included:

[0065] The user division module 21 is used to divide the users into two categories according to the quality of service request characteristics of the users: users requesting real-time services and users requesting non-real-time services;

[0066] The transmission mode switching processing module 22 is used to switch between the space multiplexing transmission mode and the space diversity transmission mode according to the minimum Euclidean distance of the encoded codebook for users requesting real-time services; for non-real-time service requests The user realizes switching between the space multiplexing transmission mode and the space diversity transmission mode according to the transmission capacity of the user.

[00...

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Abstract

The embodiment of the invention provides a method and a device for switching the transmission mode of a multi-input multi-output (MIMO) communication system. The method comprises the following steps of: dividing users into two types, namely real-time service request users and non-real-time service request users according to the quality of service (QoS) request characteristics of the users; for the real-time service request users, switching between a spatial multiplexing transmission mode and a spatial diversity transmission mode according to the minimum Euclidean distance of a coded codebook;and for the non-real-time service request users, switching between the spatial multiplexing transmission mode and the spatial diversity transmission mode according to the transmission capacity of theusers. By the method and the device, the switching criterion of switching the MIMO mode is dynamically selected for the real-time service request users or the non-real-time service request users on the basis of QoS requests of the users.

Description

technical field [0001] The present invention relates to the field of communication technologies, and in particular to a method and device for switching transmission modes of a MIMO (Multi Input Multi Output) communication system. Background technique [0002] MIMO technology can improve system capacity and transmission reliability by adopting space multiplexing and diversity respectively. Spatial multiplexing mainly divides data transmission into multiple independent transmission streams, and transmits the transmission streams through different antennas, thereby improving the transmission capacity of the system. The space diversity is to send the same copy of information on different antennas so that it can effectively resist channel fading and improve the diversity gain of the system. [0003] The performance of the MIMO communication system can be further improved by switching between space multiplexing and space diversity modes in the MIMO communication system. A mode s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04L1/00
Inventor 李曦毛旭谢人超李屹纪红李希金王成金
Owner BEIJING UNIV OF POSTS & TELECOMM
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