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Signal emission method and device of down link in multi-user MIMO (Multiple Input Multiple Output) system

A downlink and signal transmission technology, applied in diversity/multi-antenna systems, space transmit diversity, baseband system components, etc., can solve the problems of low signal-to-interference ratio and high transmit energy, reduce interference, and reduce side lobe energy. , Improve the effect of receiving signal-to-interference ratio

Inactive Publication Date: 2010-07-21
PEKING UNIV
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Problems solved by technology

[0006] The problem to be solved by the present invention is to provide a downlink signal transmission method and device in a multi-user MIMO system, so as to overcome the problems in the prior art due to the fact that each antenna unit at the base station transmitting end transmits signals independently in the spatial omnidirectional range. As a result, the defects of high transmission energy and low signal-to-interference ratio of user receivers

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  • Signal emission method and device of down link in multi-user MIMO (Multiple Input Multiple Output) system
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  • Signal emission method and device of down link in multi-user MIMO (Multiple Input Multiple Output) system

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specific Embodiment

[0046] There are K=2 users in the downlink system: user 1 and user 2, and the correlation coefficient between the signals of the two users is equal to 0.2. The base station transmitter uses M=2 antenna elements with adjustable spatial response, and each linear antenna array is composed of an equidistant linear array with 4 elements, namely L 1 =L 2 = 4.

[0047] The two antenna units of the base station transmit data to the user end, and the two transmitting antennas respectively take a certain direction as the center and extend at a certain angle to reach the user end and its surrounding objects. The signal is a multipath signal formed by the surrounding objects. Reach the user end receiving antenna.

[0048] Using the estimation algorithm of the direction of arrival of the signal wave, we can know the direction range of each user relative to the base station Φ: the angular range of the user 1 and its scatterers relative to the base station antenna unit 1 As: [30°, 35°], the angu...

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Abstract

The invention discloses a signal emission method of a down link in a multi-user MIMO (Multiple Input Multiple Output) system. The signal emission method comprises the following steps of: generating a signal sj(n) transmitted to each user; pre-coding the signal sj(n) according to a channel estimation result and the spatial response of a transmitting antenna unit; controlling the spatial response of the transmitted signal by utilizing the arrival direction range phi of signal waves transmitted to a base station by the users and a distance D between each user and the base station; and transmitting the signal to a channel by utilizing the transmitting antenna unit with adjustable spatial response. The invention also discloses a signal emission device of the down link in the multi-user MIMO system. The invention adopts the antenna unit with adjustable spatial response to improve the receiving signal to interference ratio and can emit the signal only aiming at the users within a specific direction range through adjusting the weighting amplitudes and the phases of each array element signal in the antenna unit, thereby the emission power and the interferences among multiple users are reduced.

Description

Technical field [0001] The present invention relates to the field of wireless communication technology, and in particular to a method and device for transmitting downlink signals in a multi-user MIMO system. Background technique [0002] The next generation wireless communication system will provide users with higher data transmission rates and better service quality, and the system capacity will be greatly increased. However, the wireless spectrum resources available for wireless communication are limited, so the next-generation wireless communication technology must try to improve spectrum utilization. Multiple-input multiple-output (MIMO) systems are adapting to the requirements of future wireless communication technology development, and have been developing rapidly in recent years. MIMO system refers to a wireless communication system in which signals are sent through multiple transmitting antennas at the transmitting end, and multiple receiving antennas are used to receive...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04L25/03
Inventor 尚勇史双宁张小欣杨赞赵玉萍
Owner PEKING UNIV
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