Research On Novel Non-orthogonal Multiple Access Technologies For 5G Radio Transmission

In order to support the future development of mobile Internet and Internet of Things,the fifth-generation(5G)wireless communication for 2020 would be the main solution for future human to human,human to machine and machine to machine communication.It means that the future 5G wireless communication should satisfy diversified access requirements of massive user terminals and adapt to different data traffic,such as fast wireless broadband access,massive capacity,ultra-high peak rate,low latency and response time,ultra-low power consumption,massive connectivity,supportable for new kinds of network deployments scenarios,high reliability and so on.However,the orthogonal frequency division multiple access(OFDMA)for 4G is no longer suitable for future 5G wireless communication.Especially for 5G massive machine type communication(mMTC)scenario,it's a kind of sporadic overload system transmitting small data packets.If orthogonal multiple access(OMA)is continued in 5G,there would be a waste of spectrum resources and excessive scheduling overhead.Therefore,in order to avoid the waste of air interface resources,novel non-orthogonal multiple access technologies should be researched to improve the spectrum efficiency for small packet transmission scenario.In this paper,the implementation of newly proposed non-orthogonal multiple access schemes for 5 G radio transmission and corresponding receiver algorithms are well investigated.Besides,a new non-orthogonal multiple access scheme is proposed.At the same time,corresponding receiver algorithms are designed and evaluated based on link-level simulation.The detail arrangement is as follows:1.According to the newly proposed non-orthogonal multiple access techniques,such as Low Density Signature(LDS),Sparse Code Multiple Access(SCMA),Pattern Division Multiple Access(PDMA),Multi-user Shared Access(MUSA),Non-orthogonal Multiple Access(NOMA),Resource Spread Multiple Access(RSMA)and other multiple access schemes,much research work have been done focusing on the design principle of their transceiver.And for the mature schemes,like SCMA,MUSA and NOMA,corresponding receiver algorithms including Message Passing Algorithm(MPA),Minimum Mean Square Error(MMSE)and Successive Interference Cancellation(SIC)algorithms have been well studied;2.A novel scheme named non-orthogonal multiple access(NOCA)is proposed,in which Zadoff-Chu based spreading sequences are used for user identification.And referring to the existing available methods for non-orthogonal multiple access,corresponding joint minimum mean square error detection algorithm with iterative interference cancellation(MMSE+IC)is applied to NOCA;3.Based on the LTE(Long Term Evolution)platform,a link-level simulation platform is built to evaluate the multiple access technologies including NOMA of NTT DoCoMo and LDS\SCMA of Huawei.At the same time,OFDMA and SCMA is performed as baseline for the performance evaluation and theoretic analysis of NOCA;4.In the uplink asynchronous access of mMTC scenario,a new detection algorithm which is anti-asynchronous to interference is proposed for NOCA,and based on the mature link simulation platform,the anti-asynchronous performance of SCMA and NOCA are evaluated respectively.5.Considering the constraints of the hardware implementation of actual base station and user terminal,the receiver type and computation complexity of existing algorithms for non-orthogonal multiple access schemes in 5G are well analyzed in detail.