Multi-cell MIMO system uplink signal detection method based on constellation structure

A signal detection and multi-cell technology, applied in the baseband system, multi-carrier system, baseband system components, etc., can solve the problem of large amount of soft information, reduce the amount of calculation, reduce the amount of information interaction, and reduce the complexity of communication Effect

Active Publication Date: 2015-08-19
ZHEJIANG SCI-TECH UNIV
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Problems solved by technology

However, for a multi-user system using high-order modulation, as the number of base stations and users increases, the amount of soft information to be transmitted is very large

Method used

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  • Multi-cell MIMO system uplink signal detection method based on constellation structure
  • Multi-cell MIMO system uplink signal detection method based on constellation structure
  • Multi-cell MIMO system uplink signal detection method based on constellation structure

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Embodiment

[0054] Such as figure 2 As shown, four base stations are selected for cooperative detection. Base stations BS1, BS2, BS3, and BS4 are mutually adjacent base stations. The four base stations perform soft information interaction. During the interaction process, each base station sends the posterior probability data to All neighboring base stations participating in cooperative detection. Such as image 3 As shown, the black point is the largest posterior probability data in the constellation diagram, which is selected as the reference point, and the gray point is the four posterior probability data of the upper, lower, left, and right sides of the reference point. The reference point and its upper, lower, left, and right sides are selected. Four posterior probability data, and send the posterior probability data of the selected symbol to the corresponding adjacent base stations participating in the cooperative detection.

[0055] Figure 4 In the case of cooperative detection...

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Abstract

The invention discloses a multi-cell MIMO system uplink signal detection method based on a constellation structure. The method includes the following steps: each base station detects all signals, obtains the posterior probability of all symbols of each base station, and selects the constellation point in each constellation diagram which corresponds to the maximum posterior probability data as a reference point of the whole constellation diagram; each base station selects posterior probability data of the reference point and an adjacent constellation point in the constellation diagram, and the selected posterior probability data of the constellation point are sent to a corresponding adjacent base station which participates in cooperative detection; after receiving soft information of local user symbols sent by another base station, each base station calculates posterior probability data that are not selected to send by other base station; and each base station performs soft merging on processed complete probability data, calculates the posterior probability of symbols sent by users of the cell, and selects the symbol with a maximum probability as a final detection result. The method provided by the invention can effectively reduce complexity of uplink baseband signal detection in a multi-cell MIMO system.

Description

technical field [0001] The invention belongs to mobile communication technology, in particular to a method for detecting uplink signals of a multi-cell MIMO system based on a constellation structure. Background technique [0002] In a multi-user multi-cell MIMO system, multiple base stations cooperate to jointly detect the uplink signals of multiple users to improve the accuracy of signal detection, but this method is complex and requires a large amount of calculation. As the number increases, the amount of computation increases exponentially. [0003] After searching the prior art, it was found that Shaoshi Yang and Tiejun Lv were in "Distributed Probabilistic-Data-Association-Based Soft Reception Employing Base Station Cooperation in MIMO-Aided Multiuser Multicell Systems" IEEE Trans.Vehicular Technology.vol.60, no. 7, pp.3532-3538, Sept.2011. (i.e. base station distributed cooperative detection based on probabilistic data association technology in multi-user multi-cell M...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L25/03H04L27/34
CPCH04L1/005H04L25/03318H04L27/3455
Inventor 史清江俞佳敏樊晓琦彭成徐伟强
Owner ZHEJIANG SCI-TECH UNIV
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