Increment mixing decoding amplification forwarding cooperation method based on opportunistic relaying

Abstract

The invention provides an increment mixing decoding amplification forwarding cooperation method based on opportunistic relaying and belongs to the technical field of wireless digital transmission. A system comprises an information source node, a destination node and N relay nodes. Each node is provided with an antenna. The system works in a half-duplex transmission mode. The communication process of the system includes the first step of selecting the relay nodes with optimal communication channel conditions to participate in cooperation from the N relay nodes according to the opportunistic relaying criteria within each coherence time period of a communication channel, and the second step of selecting a corresponding cooperative transmission method, namely, direct transmission, decode-and-forward transmission and amplification forwarding transmission, through comparison between the threshold valve of an instant signal-to-noise ratio of links and a corresponding set signal-to-noise ratio of the links. According to the increment mixing decoding amplification forwarding cooperation method based on opportunistic relaying, relays and cooperation schemes can be flexibly selected according to the conditions of the communication channel and the relay nodes. Consequently, the performance of a cooperative relay system is improved, and the transmission power and the bit error rate required by the system are reduced.

Description

technical field [0001] The invention relates to an opportunistic relay-based incremental hybrid decoding, amplification and forwarding cooperation method, which belongs to the technical field of wireless digital transmission. Background technique [0002] With the rapid development of information technology, the wireless communication field has higher and higher requirements for the effectiveness and reliability of data transmission, and some new technologies have also emerged. Among them, the multiple-input multiple-output (MIMO) technology does not take the cost of spectrum resources, turns the multipath propagation environment into a factor that is beneficial to users, greatly improves the channel capacity and the reliability of signal transmission, and has been obtained in the field of modern mobile communications. Deep research. However, due to the limitations of size and hardware complexity in the actual environment, the application of MIMO technology on wireless term...

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Problems solved by technology

K.Tourki et al. (see K.Tourki, Hong-Chuan Yang, and M.S.Alouini, "Accurate Outage Analysis of Incremental Decode-and-Forward Opportunistic Relaying," IEEE Transactions on Wireless Communications, vol.10, no.4, pp. 1021-1025, April.2011.) studied the incremental DF protocol based on opportunistic relay and gave an accurate outage performance analysis, but the system is in the source to destination node link and source to relay node link conditions In the case of bad conditions, there will be communication interruption, which does not have basic robustness and cannot effectively improve system performance

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