Speed and power self-adaptation method based on physical layer network coding

Abstract

The invention discloses a speed and power self-adaptation method based on physical layer network coding and belongs to the technical field of communication networks. The method includes the steps that firstly, network transmission conditions are set, signals are sent, then the relation among the bit error rate, the transmission power and the transmission speed which are obtained after decoding is constructed according to the signals received by a receiving end, a signal transmission first time slot is constructed according to the relation of the bit error rate, the transmission power and the transmission speed, when the signal transmission speed is fixed, the constraint condition of the transmission power is optimized, and finally the signal transmission first time slot, the optimal signal transmission rate, the optimal transmitting power set of a transmitting end and the optimal transmission speed of a signal transmission second time slot are obtained and set to be fixed values in network data transmission. According to the speed and power self-adaptation method, under the condition of reasonable time delay, the network throughput is improved, the transmission time delay is shortened, the signal transmission time is shortened, the effectiveness of the network is ensured, the speed and power self-adaptation method is suitable for various network environments in which a PNC can be adopted, and the speed and power self-adaptation method has large practical value in practical network transmission.

Description

technical field [0001] The invention belongs to the technical field of communication networks, in particular to a rate power adaptive method based on physical layer network coding. Background technique [0002] Network coding can improve the throughput of the wireless network. In traditional network coding (conventional network coding, CNC), the relay node receives and encodes the data packets from the source node respectively, and then broadcasts the encoded data packets; while the physical layer Network coding (physical-layer network coding, PNC) can improve network throughput to a greater extent on the basis of CNC. When using physical-layer network coding, the relay node encodes the data packets received from the source node at the same time. And broadcast through the broadcast channel; PNC generally adopts two relay modes: amplify-and-forward (AF) and denoise-and-forward (DNF). for ANC. [0003] In wireless networks, channel conditions vary with channel fading conditi...

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Problems solved by technology

[0003] In wireless networks, channel conditions vary with channel fading conditions and node locations. In order to maximize network throughput, it is necessary to adaptively change the data transmission rate to suit channel conditions; most existing work focuses on Research supports the rate adaptation mechanism of traditional network coding (CNC), and the rate adaptation mechanism based on physical layer network coding (PNC) has not been widely studied; however, PNC is based on the encoding of data packets from source nodes by CNC respectively. , adopting the strategy of simultaneously encoding the data packets from the source node, compared with CNC, PNC further saves the number of transmission slots, so that the network throughput can be improved to a greater extent, so the study of PNC in the actual network The application has great research significance and practical value; at present, there has been research on rate adaptation based on amplify and forward (AF) PNC, but it mainly considers the influence of channel capacity and adopts the method of fixed rate and power. Due to the influence of frequent changes in channel conditions, the optimal solution cannot always be found accurately, and the network throughput can be further improved, while the power-rate adaptation based on denoising and forwarding (DNF) PNC has never been studied

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