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Signal processing method and system for multi-user MIMO

A signal processing and downlink technology, applied in the field of communication, can solve problems such as inability to apply multi-user scenarios

Inactive Publication Date: 2009-06-17
ZTE CORP
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  • Summary
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Problems solved by technology

There is also an equalizer using LR technology moved to the transmitter, and a reduced precoding algorithm for single-user MIMO systems is proposed, but joint decoding at the receiver is still required, so it cannot be applied to multi-user scenarios

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Embodiment Construction

[0018] The specific implementation manners of the present invention will be described in detail below with reference to the accompanying drawings.

[0019] refer to figure 1 , illustrating a signal processing method for a multi-user MIMO downlink according to an embodiment of the present invention. like figure 1 As shown, the method includes the following steps:

[0020] S102, the receiving end feeds back the channel matrix to the transmitting end through feedback, and then the transmitting end transforms the channel matrix using the subtraction algorithm, as shown in formula (1):

[0021] h rd = TH (1)

[0022] Among them, H rd is an equivalent channel matrix with approximately orthogonal row vectors obtained through a subtraction algorithm, and T is an integer matrix satisfying |det(T)|=1. Since the inverse matrix of the unimodular matrix T always exists and is also an integer matrix, there is H=T -1 h rd .

[0023] S104. Perform linear precoding on the transmitted ...

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Abstract

The invention discloses a signal processing method for a multi-user multi-input multi-output downlink and a system thereof, wherein the system comprises the following steps: an S102 step that transforming a channel matrix fed back by a receiving end through the lattice-reduction algorithm, an S104 step that conducting the linear precode for a sending signal through a transformed linear precode matrix, and an S106 step that restricting the size of the sending signal passing through the linear precode through a modular arithmetic unit. The invention effectively reduces the emitting power of thelinear precode algorithm, inhibits the noise enhancement, increases the receiving signal-to-noise ratio (SNR), and improves the error code percentage performance of the system.

Description

technical field [0001] The present invention relates to the communication field, and more specifically relates to a signal processing method and system for multi-user MIMO downlink. Background technique [0002] In recent years, a multiple-input multiple-output (Multi Input Multi Output, MIMO for short) downlink system suitable for multiple users has attracted great attention due to its huge potential in terms of capacity and link reliability. In the multi-user MIMO downlink, each user cannot assist in demodulation, so pre-processing is required at the transmitter to offset the co-channel interference between users. The dirty paper coding (Dirty Paper Coding, DPC for short) technology can effectively pre-cancel the signal interference that may be caused between users at the transmitting end, and obtain the upper limit of the capacity of the downlink. However, due to the complicated codec of DPC, it is difficult to be used in the actual system. Therefore, some practical pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L27/26
Inventor 郝东来
Owner ZTE CORP
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