Relay selection method adopting MRC and suitable for SWIPT HDAF protocol

Abstract

The invention provides a relay selection method adopting MRC and suitable for an SWIPT HDAF protocol. A relay transmission process comprises four stages: an information source node broadcasts an energy signal in (1-[alpha]) T, and a relay node Rk collects energy; the relay node Rk receives the information signal broadcasted by the information source node in the first [alpha]T / 2; in the second [alpha]T / 2, a first transmission node forwards the received signal to a destination node by adopting a hybrid decoding-amplifying forwarding protocol; and in the third [alpha]T / 2, a second transmission node forwards the received signal to the destination node by adopting a hybrid decoding-amplifying forwarding protocol. According to the method, the maximization of the energy efficiency of the system is realized on the basis of ensuring the reliability of link communication, so that the optimal performance of the multi-antenna system can be exerted, and the best channel transmission performance isachieved.

Description

technical field [0001] The invention belongs to the technical field of communication, and specifically relates to a relay selection method that adopts MRC and is applicable to the SWIPT HDAF protocol. Background technique [0002] Traditional energy harvesting (Energy harvesting, EH) technology can collect energy from the surrounding natural environment (such as solar energy, wind energy, vibration energy, etc.), but this energy cannot be obtained at any time and is not easy to control. In recent years, people have begun to pay attention to a new technology that can harvest energy from radio-frequency signals (Radio-frequency, RF) in the surrounding environment. Since radio frequency signals (such as Wi-Fi signals and cell signals, etc.) are usually spread around the nodes in the wireless network, if the energy carried in these radio frequency signals can be collected and utilized, the survival time of the wireless network will be improved, and at the same time Energy colle...

AI Technical Summary

Problems solved by technology

The AF protocol means that the relay simply amplifies the received signal and forwards it to the destination node. Its advantage is that the system overhead and complexity are small, but it also amplifies the noise and reduces the system performance.

In energy-constrained networks, such as wireless sensor networks, it is very difficult to replace or recharge nodes that are usually powered by batteries.

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