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A frequency domain equalization method and device under uplink mu-mimo conditions

A frequency domain equalization and conditional technology, applied in the field of communication, can solve problems such as detection performance deterioration

Active Publication Date: 2016-09-28
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0026] Through theoretical analysis, it can be seen that in an interference-limited system (there is strong inter-user interference or co-channel interference caused by frequency reuse in the system), the MRC detection method in the prior art only treats the interference as noise. When the receiving signal plays a leading role, it is easy to cause a sharp deterioration in detection performance

Method used

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  • A frequency domain equalization method and device under uplink mu-mimo conditions
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  • A frequency domain equalization method and device under uplink mu-mimo conditions

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Embodiment 1

[0072] First, without loss of generality, it is assumed that there are two paired users in the LTE uplink target cell i, and the following variables are defined:

[0073] i represents the target cell number, slot represents the slot number, symbol represents the SC-FDMA symbol number, sc represents the subcarrier number, N R Indicates the number of uplink receiving antennas;

[0074] and are the pilot signals of the paired user 1 and user 2 in the slot th time slot and sc th subcarrier respectively, which are 1×1 dimensional scalars;

[0075] Indicates the received signal on the sc-th pilot subcarrier in the slot-th time slot, which is N R ×1-dimensional column vector;

[0076] Represents the received signal on the symbol SC-FDMA symbol and the sc data subcarrier, which is N R ×1-dimensional column vector;

[0077] and Respectively, in the target cell i, the channel response estimates obtained by channel estimation of the pilot subcarriers of the paired user 1 ...

Embodiment 2

[0092] Similarly, without loss of generality, it is assumed that there are two paired users in the LTE uplink target cell i, and the following variables are defined:

[0093] i represents the target cell number, slot represents the slot number, symbol represents the SC-FDMA symbol number, sc represents the subcarrier number, N R Indicates the number of uplink receiving antennas;

[0094] and are the pilot signals of the paired user 1 and user 2 in the slot th time slot and sc th subcarrier respectively, which are 1×1 dimensional scalars;

[0095] Indicates the received signal of the pilot subcarrier on the sc subcarrier in the slot th time slot, which is N R ×1-dimensional column vector;

[0096] Represents the received signal on the symbol SC-FDMA symbol and the sc pilot subcarrier, which is N R ×1-dimensional column vector;

[0097] and Respectively, in the target cell i, the channel response estimates obtained by channel estimation of the pilot subcarriers o...

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Abstract

The invention discloses a method and device for equalizing a frequency domain under the condition of uplink MU-MIMO, and relates to the communication technology. The method comprises the step of obtaining a channel responding estimated value according to channel estimation carried out on a pilot frequency subcarrier and determining an equivalent channel estimated matrix of the pilot frequency subcarrier of each group of matched users, the step of determining equivalent pilot frequency sending vector quantity according to a pilot frequency signal of each group of matched users, and the step of carrying out frequency domain equalization based on IRC according to the equivalent channel estimated matrix of the pilot frequency subcarrier and the equivalent pilot frequency sending vector quantity, and therefore the interference can be effectively restrained when the frequency domain is equalized.

Description

technical field [0001] The present invention relates to communication technology, in particular to a frequency domain equalization method and device under uplink MU-MIMO conditions. Background technique [0002] The uplink of the Long Term Evolution (LTE) system adopts the Single Carrier-Frequency Division Multiple Access (SC-FDMA) technology, and the users in the cell are orthogonal to each other without interference, but each The same frequency band is used between the cells, and the interference between the cells becomes the main interference. In many practical scenarios, LTE uplink is an interference-limited system. At the same time, in order to effectively utilize uplink wireless resources to increase uplink capacity, LTE uplink adopts virtual Multiple Input and Multiple Output (MIMO) technology, that is, uplink Multi-User MIMO (MU-MIMO) )technology. Under the condition of uplink MU-MIMO, narrowband interference may still exist on some physical resource block (Physic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/04H04L25/03
Inventor 任斌李琼戴晓明肖国军
Owner DATANG MOBILE COMM EQUIP CO LTD
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