Distributing and transmitting scheme with amplified forwarding power for wireless sensor network of two-hops

Abstract

The invention discloses an amplifying and transmitting power distribution transmission proposal based on a distributed linear dispersive code. The proposal comprises the steps that: 1) in a two-hop wireless transducer network, a transmitting terminal as an information source node transmits a RTS packet to a potential relay node to perform a reservation request for a channel; 2) each relay node receiving the RTS packet estimates a signal-to-noise ratio of the RTS packet, embeds information of the signal-to-noise ratio into a RTS packet of remote communication, and transmits a reservation channel of the RTS packet to an information sink which estimates the signal-to-noise ratio of the RTS packet from each relay node; 3) the estimated signal-to-noise ratio of the RTS packet of the remote communication is embedded into a CTS packet by the information sink and is returned to the relay node, and is embedded into a CTS packet in local communication and is returned to the information source node after being received by the relay node, so that the information source node, the relay node and an information sink node can understand information of the signal-to-noise ratio of the RTS packets of all channels; 4) an information source calculates optimized transmitting power of the information source to broadcast signals to relays, after a received signal is normalized by the relay node, a structure of the linear dispersive node is formed by adopting an amplifying and transmitting protocol, thereby transmitting the signal to the information sink with the optimized transmitting power; 5) a receiving terminal of the information sink also can calculate transmitting power of the information source and each relay node, and the decoding can be performed by combining the information and adopting maximum likelihood algorithm or sphere decoding algorithm. The proposal sufficiently represents diversity gain of the distributed linear dispersive code.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a two-hop wireless sensor network amplification and forwarding power allocation transmission scheme based on distributed linear dispersion codes. Background technique [0002] Compared with the traditional single-antenna system, the multi-antenna (MIMO) technology can achieve better transmission performance under the same transmission power and transmission rate, and it is a research hotspot in the field of wireless communication today. MIMO mainly includes providing space diversity and space multiplexing. However, due to factors such as the price and volume of terminal equipment, it is not suitable to configure multiple antennas on the nodes of wireless sensor networks. Therefore, the virtual MIMO technology for cooperative transmission between multiple terminals with a single antenna came into being. Although space diversity can be achieved by cooperative networks using f...

AI Technical Summary

Problems solved by technology

Orthogonal space-time block coding schemes cannot transmit signals at a full rate in order to satisfy the orthogonality of codewords when there are more than two relays; quasi-orthogonal space-time block coding schemes choose between code rate and orthogonality. A compromise, full rate transmission can be achieved, but full diversity gain cannot be achieved

Moreover, these space-time coding schemes are designed for a fixed number of transmitting antennas, but in a cooperative relay network, the number of relay nodes is often uncertain or changing, and information needs to be exchanged between relay nodes to confirm the use of a certain Coding scheme, protocol processing is very complex

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