Abstract
In millimeter-wave (mm-wave) cellular systems, beamforming antennas are necessary at both the base station (BS) and mobile station (MS) to compensate for high attenuation in mm-wave frequency bands and to extend the transmission range. The beamforming antennas also allow each BS to serve a number of MSs simultaneously, providing a substantial gain in system capacity. In space-division multiple access (SDMA) systems, the challenge is the inter-beam interference (IBI) caused by adjacent beams that are formed by the BS in the same cell and BSs in neighboring cells. The beams that are formed toward MSs in each cell may generate significant interference to MSs in neighboring cells, especially for MSs at the cell boundary. In this paper, we propose four different digital precoding techniques (Type-1, Type-2, Type-3, and Type-4) to reduce IBI in mm-wave cellular systems with a hybrid beamformer. Simulation results show that the proposed techniques can reduce the IBI in mm-wave cellular systems effectively, compared with a single-cell multiuser case.
Highlights
Mobile traffic has been increasing markedly owing to the growth of various devices such as smart phones and sensor nodes
The array gain obtained with the directional beamforming extends the coverage of the mm-wave systems that suffer from a high path loss owing to a high carrier frequency [4,5,6]
3, we verify the performances of the proposed different precoders, and compare pros and cons of the precoders for reduction of inter-beam interference (IBI) in multicell techniques by performingAlso, computer simulations using a simpleappropriate model of an multiuser environments
Summary
Mobile traffic has been increasing markedly owing to the growth of various devices such as smart phones and sensor nodes. Mm-wave communication is being considered for enhanced mobile broadband (eMBB) in New Radio (NR) currently being standardized for generation cellular systems [17] Both analog beamforming and hybrid beamforming are allowed in the pre-5G specification and NR standard. We propose precoding techniques for mm-wave systems with a hybrid beamformer in multicell multiuser environments. We propose four different digital precoding techniques (Type-1, Type-2, Type-3, and Type-4) to reduce IBI in mm-wave cellular systems with hybrid beamforming. 3, we verify the performances of the proposed different precoders, and compare pros and cons of the precoders for reduction of IBI in multicell techniques by performingAlso, computer simulations using a simpleappropriate model of an multiuser environments.
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