Wireless relay deployment method of SCMA network

Abstract

The invention discloses a wireless relay deployment method of an SCMA network. The method comprises the following steps: 1, a two-hop SCMA network relay communication model is established; 2, in the first stage, a base station sends data to relays and the users, and in the second stage, the relays which receive data successfully send data to the users which receive data unsuccessfully; 3, the average outage probability Ps of the user in the two stages is calculated; and 4, an optimal relay deployment method which enables the average outage probability to be minimized is solved through a power distribution factor and a relay position factor which are related to relay deployment and contained in the Ps. According to the method, a power distribution mechanism and a relay deployment mechanism in the SCMA network are given, the spectrum efficiency can be effectively improved, the average outage probability of the users is reduced, the average outage probability of the users is obtained through calculation according to the probability function solution, and therefore calculation does not need to be conducted in real time according to channel gains, complexity is lower, and deployment is easy.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, and it is specifically a kind of wireless relay deployment method of SCMA network. Background technique [0002] Sparse code multiple access (SCMA) is a non-orthogonal multiple access technology in the code domain, which was first proposed in 2013 by Nikopour, H.; Baligh, H.Sparse Code Multiple Access.In Proceedings of the 2013IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), London, UK, 8–11 September 2013, pp.332–336. Compared with orthogonal multiple access (OMA), SCMA can effectively increase the number of user connections and alleviate the problem of wireless resource shortage. In the urban environment, due to the complex channel environment, it is difficult to meet the needs of future high-reliability communication, and the introduction of wireless relay can use diversity gain to improve link robustness and cell co...

AI Technical Summary

Problems solved by technology

However, this literature only analyzes the outage performance and assumes that the relay is fixed, and does not optimize for relay deployment

Therefore, in the existing SCMA-related research, there are few related to how to carry out effective relay deployment, and the relay deployment scheme of orthogonal multiple access is difficult to apply to SCMA network

[0004] To sum up, in the existing OMA relay network, resources between users are orthogonal, the same time-frequency resource can only serve one user, and the spectrum efficiency is low

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