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Cooperative communication method and target user end

A target user and cooperative communication technology, which is applied in the field of cooperative communication methods and target users, can solve the problems that channel estimation algorithms cannot be directly applied to cascaded channels, multi-antenna system modification, security and power consumption limitations, etc.

Active Publication Date: 2015-08-05
THE SECOND RES INST OF CIVIL AVIATION ADMINISTRATION OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Existing technology MIMO is aimed at the field of civil aviation, especially the introduction of multi-antenna systems on airborne or handheld terminals will encounter limitations in modification, safety, and power consumption.
At the same time, in terms of channel estimation, channel estimation algorithms in traditional MIMO cannot be directly applied to cascaded channel situations

Method used

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  • Cooperative communication method and target user end
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  • Cooperative communication method and target user end

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] An embodiment of the present invention provides a collaborative communication system, see figure 1 , the system consists of:

[0047] The source user terminal 11 is used for transmitting signals;

[0048] The relay client 12 is configured to receive the signal transmitted from the source client 11, process the signal according to the cooperative communication strategy between the relay clients, and forward the processed signal;

[0049] The target user end 13 receives the signal from the relay user end 12, demodulates and decodes the signal, and obtains the original transmission signal of the source user end 11.

[0050] Wherein, the number of relay clients 12 may be at least two according to specific application implementation scenarios. The embodiment of the present invention is described by taking two relay clients as an example, but does not limit the number of relay clients in specific implementation applications.

[0051] In a specific implementation, the colla...

Embodiment 2

[0055] An embodiment of the present invention provides a collaborative communication system, see image 3 , the system consists of:

[0056] The source user terminal 31 is configured to transmit the signal after preprocessing the signal;

[0057] Wherein, the source user terminal 31 uses BICM (Bit Interleaved Convolutional Modulation, Bit Interleaved Coding Modulation) to preprocess the signal before transmitting the signal, and then transmits it;

[0058] Specifically, the source client 31 includes:

[0059] A channel coding unit 311, performing channel coding processing on the signal;

[0060] Wherein, the channel coding may utilize a convolutional code.

[0061] The interleaving processing unit 312 performs interleaving processing on the signal after channel coding processing;

[0062] The signal modulation unit 313 performs signal modulation on the interleaved signal.

[0063] Further, the source user end further includes a transmitter, configured to transmit the modu...

Embodiment 3

[0079] An embodiment of the present invention provides a cooperative communication method, which is based on such as Figure 4 The collaborative communication architecture shown. exist Figure 4 Among them, each sub-channel of channel I and channel II is represented by f i and g i Indicates that since the cooperative communication method provided by the embodiment of the present invention is described by taking the NLOS communication environment as an example, it can be assumed that f i and g i All are Rayleigh (Rayleigh) channels, and satisfy non-selective and IID (independent and identically distributed, independent and identically distributed) attenuation characteristics. To this end, the channel statistics are described by CN(0, 1), where CN(μ,σ 2 ) means the mean and variance are μ and σ respectively 2 The complex circular Gaussian distribution of . Furthermore, assuming that the noise n at the relay client end ri and the noise n at the target user end d Gaussian...

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Abstract

The invention discloses a cooperative communication method and a target user end and belongs to the communication technical field. The method comprises the following steps of: receiving signal vectors forwarded by relay user ends through a channel; detecting the signal vectors according to a minimum mean square error method to obtain first detection signals; approximating target user end noise vectors in the first detection signals according to a Gaussian approximation method to obtain second detection signals; performing log likelihood ratio calculation on the second detection signals; and performing de-interleaving and convolutional code decoding on the signals which have been subjected to the log likelihood ratio calculation so as to obtain original transmitting signals. According to the cooperative communication method of the invention, through cooperative communication of the relay user ends and the target user end, a single antenna can be utilized to transmit and receive signals at each user end, and therefore, limitations of a MIMO communication mode at communication terminals such as handheld communication terminals, aircrafts and vehicles in the aspects such as modification, cost and power consumption can be eliminated.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a cooperative communication method and a target user terminal. Background technique [0002] In the past aviation communication, the wireless communication system mainly adopts the analog voice communication technology based on VHF (Very High Frequency, very high frequency). However, with the development of civil aviation business, even if the VHF channel spacing is minimized, it cannot fully meet the operational requirements of the airport scene. For this reason, ICAO (International Civil Aviation Organization, International Civil Aviation Organization) proposed AeroMACS (Aeronautical Mobile Airport Communications System, aviation mobile airport communication system) technology in order to improve the operation efficiency and communication capacity of the airport scene, which will become the aviation communication infrastructure Part of the data link. [0003] In the Ae...

Claims

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Application Information

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IPC IPC(8): H04L1/06H04L1/00
Inventor 黄忠涛张益黄荣顺李恒金立杰
Owner THE SECOND RES INST OF CIVIL AVIATION ADMINISTRATION OF CHINA
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