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Power control method of multi-input multi-output space multiplexing mode

A space multiplexing and power control technology, applied in the direction of transmission control/equalization, diversity/multi-antenna systems, advanced technology, etc., can solve problems such as network performance degradation, power control failure, and strong channel correlation, and achieve improved resistance Interference and anti-fading performance, and the effect of avoiding power control failure

Active Publication Date: 2009-10-07
ZTE CORP
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a power control method of multiple-input multiple-output spatial multiplexing mode, which is suitable for broadband wireless OFDMA systems, so as to solve the problems of power control failure and network performance deterioration due to strong channel correlation

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Embodiment Construction

[0045] A power control method of a MIMO spatial multiplexing mode provided by the present invention is applicable to a broadband wireless OFDMA system; the steps of the method are: firstly perform AMC processing; secondly perform corresponding power adjustment processing according to the strength of user channel correlation, By calculating the rank of the channel matrix and its condition number, it is used as the basis for judging the strength of the channel correlation.

[0046] The above-mentioned technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and through specific embodiments.

[0047] In a cellular network, interference to useful signals includes noise, co-frequency signals of other base stations and mobile stations, and interference between multiple transmit antennas in MIMO SM mode. Therefore, the Carrier to Interference-plus-Noise Ratio (CINR, Carrier to Interference-plus-Noise Ratio) of the dat...

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Abstract

A power control method of a multi-input multi-output space multiplexing mode is suitable for a broad band wireless orthogonal frequency division multiple access (FDMA) access system and comprises the following steps: firstly, adaptively modulating a code AMC; and then, calculating the number of ranks and conditions of a channel matrix, taking the number as the judgment basis of the strength and the weakness of the channel relativity of a plurality of received parallel data streams and respectively carrying out corresponding power adjustment according to the strength and the weakness of the channel relativity. The invention controls the power according to the strength and the weakness of the channel relativity of user channels with pertinence, especially the power control method provided by aiming at the strong channel relativity of the users can effectively prevent ineffective power control under an MIMO space multiplexing mode, thereby the anti-interference property and the anti-fading property of a system are enhanced.

Description

technical field [0001] The present invention relates to the power control technology of broadband wireless Orthogonal Frequency Division Multiple Access (OFDMA, Orthogonal Frequency Division Multiple Access) system, especially relates to OFDMA system multiple-input multiple-output (MIMO, Multiple-Input Multiple-Output) spatial multiplexing ( SM, SpatialMultiplexing) mode power control method. Background technique [0002] OFDMA technology is one of the main solutions of current and future wireless communication technology. This scheme allocates several subcarriers to users, and these subcarriers are allowed to overlap in the frequency domain but always keep mutual orthogonality. In addition, the MIMO spatial multiplexing mode has become a necessary technology in the current OFDMA wireless broadband system. This technology uses a set of antennas on both the receiving and transmitting sides of the communication. At the transmitting end, the data information of a user is divi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04B7/02H04L1/06
CPCY02D30/70
Inventor 张连波邱刚董志峰吴冬凌
Owner ZTE CORP
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