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Pre-coding method and transmitter used in distributed multiple input multiple output system

A transmitter and distributed technology, applied in diversity/multi-antenna systems, transmission systems, space transmit diversity, etc., can solve problems such as low channel capacity and system throughput limitations, reduce mutual interference of signals, and improve system channels The effect of capacity

Inactive Publication Date: 2015-03-25
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, as can be seen from the above, although the use of FDMA or TDMA to transmit data can avoid mutual interference between different user signals, it is required that the system can only transmit one user data in one time slot or one frequency, which will inevitably lead to the overall channel of the system. The capacity is low, which also limits the throughput of the system

Method used

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  • Pre-coding method and transmitter used in distributed multiple input multiple output system
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  • Pre-coding method and transmitter used in distributed multiple input multiple output system

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Embodiment 1

[0025] First of all, it is explained that the interference alignment method in the embodiment of the present invention is mainly applied to a distributed multiple-input multiple-output (MIMO, Multiple-Input Multiple-Out-put) system, such as a MIMO interference system, wherein the MIMO interference system may Such as Figure 1-b shown in Figure 1-b In the MIMO interference system shown, there are K transmitters and K receivers under the original interference channel, and each transmitter and receiver has multiple antennas. In this MIMO interference system, the kth receiver The mean square error (MSE, Mean Square Error) of is calculated as follows:

[0026] MSE k = E [ | | d ^ k - d k | |...

Embodiment 2

[0082] The transmitter 200 based on the precoding method provided by the embodiment of the present invention can be as follows image 3 shown, including:

[0083] The initialization unit 201 is used to initialize the precoding matrix of the original interference channel;

[0084] In practical applications, the initialization unit 201 can initialize the precoding matrix of the original interference channel randomly, or it can also select from the preset codebook according to the channel environment (such as channel throughput, signal-to-noise ratio, frame error rate, etc.) The initial precoding matrix is ​​not limited here, and its specific implementation is known in the art, and will not be described in detail here.

[0085] An update calculation unit 202, configured to calculate the receiving filter matrix in the original interference channel according to the precoding matrix of the current original interference channel;

[0086] The update calculation unit 202 can calculat...

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Abstract

Embodiments of the present invention disclose a pre-coding method and a transmitter used in a distributed multiple input multiple output (MIMO) system. The method comprises that a dual interference channel is constructed, an interference alignment iterative calculation is performed on a pre-coding matrix in an original channel by utilizing the transformation relationship between the dual interference channel and an original interference channel; on the one hand, as the times of iterative calculation increases, the calculated pre-coding matrix in the original channel can gradually converge, and on the other hand, the total mean square error (MSE) of the interference channel system calculated from the pre-coding matrix of the original channel obtained according to the final calculation also tends to the minimum, so that the minimum of the MSE is achieved, and the mutual interference of the signals between different users is reduced.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a precoding method and a transmitter applied in a distributed MIMO system. Background technique [0002] In wireless communication systems, how to solve the mutual interference of signals during transmission has always been the focus of discussion in the industry. Among them, the characteristics of Gaussian interference channels are mainly manifested in the fact that signals from different users interfere with each other, data between users cannot be shared, and cannot Joint transmission is performed, but each user knows the complete channel information. [0003] In order to avoid mutual interference of signals between users, in the prior art, a Time Division Multiple Access (TDMA, Time Division Multiple Access) method is usually used to send data, that is, a transmitter sends data to users in different time slots. Its system diagram can be as follows Figure 1-a As shown i...

Claims

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Application Information

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IPC IPC(8): H04B7/06
CPCH04B7/0413
Inventor 沈晖李斌罗毅朱胡飞
Owner HUAWEI TECH CO LTD
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