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Wireless communication apparatus and number-of-transmission-streams determination method

A wireless communication device and a technology for sending streams, applied in wireless communication, multiplex communication, radio transmission systems, etc., can solve the problems of loss of array freedom, failure to obtain transmission diversity gain, and not necessarily forming improved reception signals, etc., to achieve Effects of increasing the degree of freedom of the array, improving SNR, and suppressing the increase in transmission power

Active Publication Date: 2018-10-23
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the BD method, since zero control consumes the degree of freedom of the base station's transmission array, it is not necessarily possible to form a transmission that improves the received signal-to-noise power ratio (SNR: Signal-to-Noise power Ratio) of each user based on the calculated transmission weight. beam
As a result, especially in a multi-user environment, there is a problem that the remaining transmit diversity gain cannot be obtained due to a large loss of array degrees of freedom due to zero control of multiple users

Method used

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  • Wireless communication apparatus and number-of-transmission-streams determination method
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  • Wireless communication apparatus and number-of-transmission-streams determination method

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Experimental program
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Embodiment approach 1

[0038] figure 1 It is a configuration diagram showing an example of the radio communication system according to Embodiment 1 of the present invention. figure 1 The wireless communication system in has a wireless base station 1 , a plurality of wireless terminals 2 and a host device 3 . In addition, in order to describe a specific application example of the wireless communication device of the present invention, in figure 1 A case where a wireless communication device is used as the wireless base station 1 is exemplified in the figure.

[0039]The wireless base station 1 is configured to be able to form transmission beams 5 directed to a plurality of wireless terminals 2 using a plurality of antennas, and to communicate with the wireless terminals 2 as opposing devices using one or more transmission beams 5 .

[0040] The wireless terminal 2 is configured to have a plurality of antennas. In addition, in figure 1 Although the case where there are two wireless terminals 2 is ...

Embodiment approach 2

[0130] In Embodiment 2 of the present invention, a description will be given of the MAC processing unit 20 having the function of reducing the diversity order used to determine the number of transmission streams for each wireless terminal 2 compared to the configuration of the previous Embodiment 1. Limit changes. In addition, in this second embodiment, the description of the same parts as those in the previous embodiment 1 is omitted, and the description will focus on the parts different from the previous embodiment 1. FIG.

[0131] The MAC processing unit 20 of Embodiment 2 calculates the received power of each stream for each wireless terminal 2 as a determination parameter based on transmission channel quality information such as RSS (Received Signal Strength: Received Signal Strength).

[0132] Then, the MAC processing unit 20 determines the wireless terminal 2 whose diversity order lower limit value is varied based on the received power of each stream as a determination ...

Embodiment approach 3

[0139] In Embodiment 3 of the present invention, a description will be given of the MAC processing unit 20 having a function of determining each stream allocated to each wireless terminal 2 in addition to the configuration of the previous Embodiment 1. FIG. In addition, in this third embodiment, the description of the same parts as those in the previous embodiment 1 will be omitted, and the description will focus on the parts different from the previous embodiment 1. FIG.

[0140] Figure 7 It is an explanatory diagram showing a processing example of the MAC processing unit 20 when the block triangulation method is adopted as the transmission precoding method in Embodiment 3 of the present invention. in addition, Figure 7 The conditions shown are the same as the previous Figure 5 same conditions.

[0141] The MAC processing unit 20 is performing the previous image 3 When calculating the value of the diversity order in the steps shown, follow the Figure 7 As shown in F...

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Abstract

A wireless communication apparatus is configured to: execute, on the basis of pieces of transmission-line quality information between the wireless communication apparatus and a plurality of respectivecounterpart wireless communication apparatuses that are targets and for each counterpart wireless communication apparatus, first processing for determining the number of allocatable maximum transmission streams; calculate a diversity order value of each stream using the number of maximum transmission streams obtained through the first processing; execute, for each counterpart wireless communication apparatus, second processing for determining the number of transmission streams by comparing the calculated diversity order values of the streams with a preset diversity order lower limit value; determine, for each counterpart wireless communication apparatus, the number of transmission streams obtained through the second processing to be the number of finally determined transmission streams; and report the determined number of finally determined transmission streams.

Description

technical field [0001] The present invention relates to a radio communication device that transmits one or more streams to a plurality of opposing radio communication devices, and a method for determining the number of transmission streams performed by the radio communication device. Background technique [0002] In order to transmit large-capacity data with a limited frequency, research and development of a MIMO (Multi-Input Multi-Output: Multiple Input Multiple Output) system using multiple transmit and receive antennas for spatially multiplexed transmission is being promoted. For further improvement of frequency utilization efficiency, an increase in the number of spatial multiplexing is expected in the future. [0003] As a method of increasing the number of spatial multiplexing, a method of performing spatial multiplexing between user terminals called MU-MIMO (Multi-User MIMO, Multi-User MIMO) can be considered, which is also included in 3GPP (Third Generation Partnersh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00H04W72/54
CPCH04J11/00H04L1/0002H04L1/0003H04L1/06H04L1/0625H04L1/0631H04B7/0452H04B7/0473Y02D30/50H04W72/542H04B17/318H04B17/336H04B17/345H04B17/382H04W52/225H04W52/241
Inventor 内田繁平明德西本浩
Owner MITSUBISHI ELECTRIC CORP
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