Pilot Sequence Design for mmWave Cellular Systems with Relay Stations in the Presence of Blockageopen access
- Authors
- Kim, Yeong Jun; Sultan, Qasim; Cho, Yong Soo
- Issue Date
- Apr-2020
- Publisher
- Institute of Electrical and Electronics Engineers Inc.
- Keywords
- Blockage; cellular system; mmWave; pilot sequence design; relay
- Citation
- IEEE Access, v.8, pp 80454 - 80467
- Pages
- 14
- Journal Title
- IEEE Access
- Volume
- 8
- Start Page
- 80454
- End Page
- 80467
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/42556
- DOI
- 10.1109/ACCESS.2020.2990710
- ISSN
- 2169-3536
- Abstract
- Due to short wavelength and weak diffraction ability, millimeter-wave (mmWave) signals are highly susceptible to blockage, which results in significant degradation in received signal power. As a possible solution for overcoming the blockage problem in millimeter-wave communication systems, the deployment of a relay station (RS) has been considered in recent years. In this paper, we discuss the problems to be considered in a relay-assisted mmWave cellular system based on orthogonal frequency division multiplexing. We describe a frame structure and a pilot-based training method to achieve efficient RS selection during blockage. In addition, a method designed to overcome the inter-symbol interference problem caused by different symbol time offsets of pilot signals received from adjacent RSs in the relay-assisted mmWave cellular system is discussed. Then, we propose two different types of pilot sequences that allow a mobile station to distinguish among the pilot sources in multi-cell multi-relay environments: pilot signals based on the Zadoff-Chu sequence (PS1) and pilot signals based on the m-sequence (PS2). The correlation property of PS2 is derived and compared with that of PS1 and another sequence (Gold sequence). Simulations are performed using a blockage model to verify the properties, constraints, and advantages and disadvantages of the proposed pilot sequences in RS-assisted mmWave cellular systems.
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