Abstract
This paper investigates the coexistence between two key enabling technologies for the fifth generation (5G) mobile networks, non-orthogonal multiple access (NOMA) and millimeter-wave (mmWave) communications. Particularly, the application of random beamforming to the addressed mmWave-NOMA scenario is considered in this paper, in order to avoid the requirement that the base station knows all the users' channel state information. Stochastic geometry is used to characterize the performance of the proposed mmWave-NOMA transmission scheme, by using the key features of mmWave systems, e.g., mmWave transmission is highly directional and potential blockages will thin the user distribution. Two random beamforming approaches which can further reduce the system overhead are also proposed to the addressed mmWave-NOMA communication scenario, where their performance is studied by developing analytical results about sum rates and outage probabilities. Simulation results are also provided to demonstrate the performance of the proposed mmWave-NOMA transmission schemes and verify the accuracy of the developed analytical results.
Highlights
Non-orthogonal multiple access (NOMA) has recently received considerable attention as a promising multiple access (MA) technique to be used in fifth generation (5G) mobile networks [1], [2]
Since the aim of this paper is to study the impact of NOMA on mmWave communications, without loss of generality, we assume that user i and user j are paired together for NOMA transmission on a randomly generated beam
We have investigated the coexistence between NOMA and mmWave communications
Summary
Non-orthogonal multiple access (NOMA) has recently received considerable attention as a promising multiple access (MA) technique to be used in fifth generation (5G) mobile networks [1], [2]. We consider a mmWave-NOMA downlink scenario, in which a base station equipped with multiple antennas communicates with multiple single-antenna nodes. We first consider the application of random beamforming to the addressed mmWave-NOMA scenario, in which a single beam is randomly generated by the base station. The fact that mmWave transmission is highly directional is used in this paper to avoid scheduling those users who are likely to have low signal strength, which reduces the number of users who need to feed their channel quality information back to the base station and reduces the system overhead. The use of one-bit feedback can effectively reduce the amount of feedback, but will cause an ordering ambiguity at the base station The impact of this ambiguity on the performance of the one-bit feedback transmission scheme is investigated. Exact expressions for the outage probabilities achieved by the random beamforming scheme and their approximations are developed in order to obtain greater insights
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