The 5G will not only offer high speed and greater capacity communication but also support the IoT. To support IoT, it is important that next generation NodeB (gNB) will be able to deal with massive uplink signals transmitted from IoT devices. Non-orthogonal multiple access (NOMA) is one of the effective methods to handle massive signals from the IoT devices. However, when NOMA is used for downlink, it is necessary to perform signal separation on the user equipment (UE), which suffers from heavy load on UE. We consider that it is better to employ orthogonal multiple access (OMA) for downlink to prevent too much computational cost and power consumption for UE. Hence, we have studied a system that uses NOMA for uplink and OMA for downlink. The feature of our system is that single carrier is used for uplink to reduce peak to average power ratio (PAPR). Although the single carrier transmission with NOMA will be in demand in the future, most of the research is computer simulation. In this paper, we demonstrated and evaluated our system using hardware. We measured the performance difference between uplink using NOMA and downlink using OMA in terms of packet error rate (PER) to obtain tips to improve uplink performance. From the result, we confirmed that uplink NOMA could be performed well in hardware. However, to improve reliability, it is necessary for the system to incorporate some techniques such as diversity with uplink NOMA. Without the techniques, the uplink with NOMA is less reliable than downlink with OMA so far.
Link-level Performance Evaluation of an ULNOMA system with TDD constructed by hardware
2020-05-01
763729 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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