Transmit power optimization method for double-hop full-duplex relay system based on energy efficiency

Abstract

The present invention considers a method for optimizing the transmission power of a double-hop full-duplex relay system based on energy efficiency. By constructing an optimization problem with the limitation of system transmission power and the limitation of the minimum spectrum efficiency and the goal of maximizing the system energy efficiency, Jointly optimize source transmit power and relay transmit power. The optimization process is to first fix the transmit power of the source, optimize the transmit power of the relay, then fix the transmit power of the relay, optimize the transmit power of the source, and repeat the alternate optimization steps of the transmit power of the relay and the source until the system reaches the maximum energy efficiency. Compared with the traditional solution based on spectrum efficiency, the present invention can effectively improve the energy rate of the system, and the calculation complexity is low, which is beneficial to engineering realization.

Description

technical field [0001] The invention relates to a relay communication system, in particular to an energy efficiency-based method for optimizing the transmission power of a double-hop full-duplex relay system. Background technique [0002] The common working modes of dual-antenna relay are mainly amplification and forwarding and decoding and forwarding. The basic principle of amplification and forwarding is that after the relay node receives the signal from the source node, it does not perform any demodulation and decoding, but directly performs analog processing. Then enlarge and forward it. The amplification and forwarding protocol is one of the earliest modes, which is the simplest to implement and has good performance, but it will bring a significant problem. The relay node will amplify and forward the received signal indiscriminately, which will inevitably amplify the noise and cause noise. The cumulative propagation of , the relay channel becomes back-to-back correlate...

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Problems solved by technology

Half-duplex splits two time slots for sending and receiving respectively, so it will get a lower information rate. Full-duplex simultaneous sending and receiving has double the information rate than half-duplex, but at the same time it will bring a new non-negligible The problem is that the receiving antenna is also working when the relay is sending a signal, so the transmitting signal of the relay will be re-received by its own receiving antenna, forming self-interference

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