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Cooperation method used under condition of multi-source single relay and based on compression forward pass

A multi-source single, base station technology, applied in transmission systems, digital transmission systems, electrical components, etc., can solve the problem that multiple users cannot use relays at the same time

Inactive Publication Date: 2011-07-06
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to propose a multi-source single-relay cooperation method based on compressed fronthaul to solve the problem that multiple users cannot use relays to cooperate at the same time, thereby improving system capacity and channel efficiency, and improving user communication quality

Method used

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  • Cooperation method used under condition of multi-source single relay and based on compression forward pass
  • Cooperation method used under condition of multi-source single relay and based on compression forward pass
  • Cooperation method used under condition of multi-source single relay and based on compression forward pass

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Embodiment 1

[0040] This embodiment introduces the specific implementation of the present invention based on the two-source single-relay communication system model, the model is as follows figure 1 As shown, there are two users S in the system 1 , S 2 , a relay R and a base station D, where the solid line represents the user transmission time slot, and the dotted line represents the relay transmission time slot. User S 1 , S 2 The system parameters between relay R and base station D are set as follows:

[0041] The distance from the user to the base station is d sd1 = d sd2 = d sd = 10m;

[0042] The distance from the user to the relay is d sr1 = d sr2 = d sr =9.5m;

[0043] The distance from the relay to the base station is d rd = 3.15m;

[0044] And the channel coefficient of the direct link from the user to the base station is C sd1 =C sd2 =C sd =1, path loss factor r=3. Calculated, Set the sending power of the two users to be equal to P s1 =P s2 =P s , relay trans...

Embodiment 2

[0060] In a user-intensive area, multiple users communicate with the base station at the same time, and the distances from these users to the relay and their distances to the base station are equal, for example Figure 4As shown, at this time, the method proposed by the present invention can be used for multi-user cooperative communication. This embodiment uses three-user cooperation as a model to introduce the specific implementation method of the present invention. The system parameters between the three users, the relay R and the base station D are set as follows:

[0061] The distance from the user to the base station is d sd = 10m;

[0062] The distance from the user to the relay is d sr =9.5m;

[0063] The distance from the relay to the base station is d rd = 3.15m;

[0064] And the channel coefficient of the direct link from the user to the base station is C sd =1, path loss factor r=3. Has been calculated, Set the sending power of all clients to be equal and P...

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Abstract

The invention discloses a cooperation method used under the condition of multi-source single relay and based on compression forward pass. The cooperation method is characterized in that under the condition of multi-source single relay, multiple users use low-density parity-check codes with the same code length to code sent information; relay nodes adopt the combination technology of compression forward pass and network coding for cooperative communication; and destination nodes adopt joint iterative decoding algorithm to code received information and obtain information sent by a source. The method overcomes the problem that relay is interrupted during communication, and ensures that the relay always assists the communication during communication process; and meanwhile, with the method, certain diversity gain can be obtained through iteration decoding algorithm, so that the communication quality is improve and the communication resources are saved.

Description

technical field [0001] The invention belongs to the technical field of cooperative communication for wireless digital information transmission, and in particular relates to a cooperative method of a multi-source single-relay cooperative communication system based on compressed fronthaul. Background technique [0002] "International Institute of Electronics and Electrical Engineers Information Theory Journal" (IEEE Transactions on Information Theory, vol.53, issue.10, October 2007, pp.3714-3722) proposed to use a system based on two-user cooperative communication, which is currently called The method for network coding and adaptive decoding front transmission can provide diversity gain for two users at the same time, guarantee the communication quality of the users, and save the resources required for communication. However, in a multi-source single-relay system, network coding adaptive decoding is used for cooperative communication, and the decoding effect of the relay node ...

Claims

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Application Information

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IPC IPC(8): H04L1/00
Inventor 张海超李辉
Owner UNIV OF SCI & TECH OF CHINA
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