Self-adaption collaboration retransmission method based on self-adaption coding modulation

An adaptive coding and self-adaptive technology, applied in the direction of preventing/detecting errors through diversity reception, using return channels for error prevention/detection, etc., can solve problems such as performance loss, reduce overhead, avoid inappropriate or no gain Collaboration, performance gain outstanding effect

Inactive Publication Date: 2008-10-08
SHANDONG UNIV
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Problems solved by technology

[0004] The present invention aims at the problem of performance loss caused by the extra signaling overhead existing in the existing cooperative communication technology, and provides an ada

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  • Self-adaption collaboration retransmission method based on self-adaption coding modulation
  • Self-adaption collaboration retransmission method based on self-adaption coding modulation
  • Self-adaption collaboration retransmission method based on self-adaption coding modulation

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Embodiment Construction

[0021] Taking the most typical and general three-node model as an example to illustrate the adaptive cooperative retransmission method based on adaptive coding and modulation of the present invention, the system model is as follows figure 1 shown.

[0022] The specific implementation steps are as follows figure 2 Shown:

[0023] Step 1: According to the service quality requirements of different services, obtain the maximum allowable packet error rate (PER) after retransmission, and determine the coding and modulation scheme level in combination with the current channel state information;

[0024] Step 2: The source end sends data to the destination end, and the destination end and the relay node receive the data at the same time;

[0025] Step 3: If the destination end decodes correctly, then feed back ACK, and the source end and relay node receive ACK at the same time; if the destination end cannot decode correctly, feed back NACK, and the source end and relay node receive...

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Abstract

The present invention discloses a self-adapting cooperative retransmission method based on the self-adapting coding modulation. The method selects an appropriate coding modulation plan grade and a largest retransmission number for transmitting the data package according to the channel state information of the direct transmission link from a source end to a target end and the service quality request of different services. Because of the broadcast characteristic of the radio channel, the target end and a relay node can receive the data simultaneously. If the target end does not decode correctly, the retransmission is actuated. The retransmission by the source end or the relay node is determined by the selected coding modulation plan and whether the relay node correctly receives the data package. The invention combines the self-adapting coding modulation technique, a hybrid automatic retransmission technique and cooperative diversity for consideration. The cooperation is selected to execute at the time when the cooperative gain is evident. The incorrect or no-gain cooperation is avoided thereby improving the transmission quality and effectively optimizing the whole capability of the system at the state that the spending of the cooperation signaling is reduced as possible.

Description

technical field [0001] The present invention relates to the link adaptive technology in the communication system and the cooperation mode of each communication node, especially for the system using Adaptive Coding and Modulation (AMC) technology and Hybrid Automatic Repeat Request (HARQ) technology, each communication node Effective Collaboration Strategies. Background technique [0002] Wireless channels are affected by various external interference and multipath fading, and have time-varying and fading characteristics. Multiple-input multiple-output (MIMO) technology can provide diversity gain and effectively combat channel fading. In order to enable the MIMO system to obtain the desired diversity gain, a certain minimum distance must be maintained between the antennas. However, in practical systems, it cannot be realized due to the volume limitation of communication nodes. In order to overcome this defect, people have proposed cooperative communication technology. It ...

Claims

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Application Information

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IPC IPC(8): H04L1/18H04L1/06
Inventor 袁东风史斐谨
Owner SHANDONG UNIV
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