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MIMO telecommunication system and user sheduling method

A communication system and user technology, applied in transmission systems, multiplex communication, radio transmission systems, etc., can solve the problems of inability to adjust the number of users, system performance loss, high system capacity, etc. System capacity, the effect of improving system capacity

Inactive Publication Date: 2007-01-10
DOCOMO BEIJING COMM LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because these factors are constantly changing, assigning any value of L to the system will cause a mismatch and result in a loss of system performance.
[0018] The common disadvantage of the above two methods is that the number of scheduled users cannot be adjusted according to the change of channel conditions, therefore, a higher system capacity cannot be obtained

Method used

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  • MIMO telecommunication system and user sheduling method
  • MIMO telecommunication system and user sheduling method
  • MIMO telecommunication system and user sheduling method

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no. 1 Embodiment

[0045] figure 1 It is a frame diagram of an adaptive scheduling MIMO communication system based on antenna selection in the present invention, wherein the adaptive scheduling MIMO communication system includes a transmitting end 10 (base station) and multiple receiving ends 20 (users). figure 2 for figure 1 Flowchart of adaptive scheduling for the shown MIMO communication system. image 3 It is a schematic diagram of the frame structure adopted by the MIMO communication system.

[0046] Such as Figure 1-3 As shown, the transmitting end 10 has a MIMO data processor 110, a MIMO scheduler 120, a duplexer group 130 and n T Root transmit antenna. Each receiver 20 has a received signal processor 210, a feedback information processor 220, a duplexer group 230, and n R Root receiving antenna. Wherein, the number of receiving antennas of each receiving end 20 may be different. The frame structure includes: channel estimation time slots, channel feedback time slots and data tra...

no. 2 Embodiment

[0102] The second embodiment of the present invention is an adaptive scheduling MIMO communication system based on beamforming. The structure of the MIMO communication system, the adaptive scheduling method and the adopted frame structure can be roughly referred to in the first embodiment Figure 1 to Figure 3 . Since the adaptive scheduling MIMO communication system in the second embodiment is based on beamforming, it is different from the adaptive scheduling MIMO communication system based on antenna selection in the first embodiment in terms of implementation. Hereinafter, the MIMO communication system of the second embodiment will be described in detail with reference to the drawings. Wherein, the same reference numerals indicate elements with the same or similar functions.

[0103] Such as figure 1 As shown, the adaptive scheduling MIMO communication system based on random transmit beamforming includes a transmitting end 10 (base station) and multiple receiving ends 20...

no. 3 Embodiment

[0145] The third embodiment will illustrate the antenna selection-based semi-adaptive scheduling MIMO communication system and the semi-adaptive scheduling method of the present invention.

[0146]The structure of the semi-adaptive scheduling MIMO communication system based on antenna selection in the third embodiment is roughly similar to the structure of the adaptive scheduling MIMO communication in the first embodiment in FIG. In addition to generating scheduling information, the MIMO communication system also needs to compare communication capacity and insert feed-forward information (assumed to be 1 bit, of course, can also be multiple bits) in the frames sent in each scheduling time slot. Therefore The scheduler needs to be configured accordingly. The feedforward information is inserted or multiplexed before the channel estimation signal of the frame by a multiplexer (the data corresponding to the channel estimation signal increases the length of the feedforward informat...

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Abstract

The MIMO communication system includes following parts: sending end in use for sending data frames including at least signal of channel estimation, and users' data; receiving end in use for receiving data frames sent from the sending end; using fading matrix of channel generates corresponding feedback signal of user, and restores users' data. The dispatching method for users includes following steps: (1) based on fading condition of channel between transmitting antenna and receiving antenna, the receiving end generates feedback signal, and sends the feedback signal to the sending end; (2) receiving the feedback signal, the sending end generates dispatching information based on the feedback signal, and uses the dispatching information to dispatch user. Based on change of channel condition, the invention can change information of dispatching user in real time so as to obtain higher system capacity.

Description

technical field [0001] The present invention relates to a MIMO communication system and user scheduling method, in particular to a MIMO communication system and user scheduling method based on antenna selection / beam forming adaptive / semi-adaptive user scheduling. Background technique [0002] Future wireless communication systems need to support very high-speed data services, such as video conferencing, video on demand, interactive video games, and so on. According to the requirements mentioned in the ITU-R M1645 document: for high-speed wireless services (High Mobility), it is necessary to support a rate up to 100Mbps; for low-speed (Low Mobility) or fixed wireless (Fixed Wireless) services, it is necessary to reach 1Gbps rate. [0003] The rate of a channel in wireless communication is equal to the product of the spectral bandwidth of the channel and the spectral efficiency of the applied technology. In order to increase the rate, the spectral bandwidth of the channel ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04B7/08H04B7/04H04J99/00
CPCH04B7/0626H04B7/0802H04B7/0669H04B7/0417H04B7/0443H04B7/0452
Inventor 潘振岗陈岚
Owner DOCOMO BEIJING COMM LAB
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