A communication system power distribution method using NOMA and D2D groups

Abstract

The invention discloses a communication system power distribution method using NOMA and a D2D group. The method comprises the following steps that: a base station firstly obtains ideal channel state information and a cellular user, a D2D sending end and a sending signal to noise ratio at a relay; The base station obtains a system interruption probability according to the received information, calculates an optimal power distribution coefficient at the D2D sending end and the relay based on the minimization of the interruption probability, and forwards the optimal power distribution coefficientto the D2D sending end and the relay respectively; The D2D sending end sends a signal to the relay by adopting a NOMA scheme by using the obtained optimal power distribution coefficient; After receiving the transmitted signal, the relay sends the signal to a cellular user and a D2D receiving end by using the obtained optimal power distribution coefficient and adopting a NOMA scheme; The method islow in calculation complexity, is suitable for the situation that the D2D user group and the cellular users multiplex the uplink spectrum resources, enables the interruption probability of the systemto be minimum through power distribution, and improves the system performance.

Description

technical field [0001] The invention relates to a communication system, in particular to a communication system power allocation method, which belongs to the technical field of resource allocation. Background technique [0002] D2D communication, also known as end-to-end communication, refers to the communication of direct exchange of information between neighboring devices in the communication network. D2D technology can improve spectrum utilization and throughput, expand network capacity, and ensure that the communication network can be more flexible, intelligent and efficient. It has opened up a new way for zero-delay communication of large-scale networks, mass access of mobile terminals and big data transmission; when the distance between D2D users is too far or the channel fading is serious, due to the limited transmission power , the signal-to-noise ratio and quality of service are difficult to guarantee. At this time, it is necessary to introduce a relay. After the re...

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Problems solved by technology

[0002] D2D communication, also known as end-to-end communication, refers to the communication of direct exchange of information between neighboring devices in the communication network. D2D technology can improve spectrum utilization and throughput, expand network capacity, and ensure that the communication network can be more flexible, intelligent and efficient. It has opened up a new way for zero-delay communication of large-scale networks, mass access of mobile terminals and big data transmission; when the distance between D2D users is too far or the channel fading is serious, due to the limited transmission power , the signal-to-noise ratio and quality of service are difficult to guarantee. At this time, it is necessary to introduce a relay. After the relay is introduced into D2D, it can not only meet the signal-to-noise ratio and service quality when the signal is too far away or the signal fading is serious, but also can By adjusting the transmission power of the relay forwarding, the entire system can obtain the maximum performance; however, when the relay is introduced, the D2D transmission changes from one time slot to two time slots, which leads to a decrease in the utilization rate of spectrum resources

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