Pilot Sequence Design for mmWave Cellular Systems With Relay Stations in the Presence of Blockage
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 deplo...
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| Format: | Article |
| Language: | English |
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IEEE
2020-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/9079537/ |
| _version_ | 1819275119258763264 |
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| author | Yeong Jun Kim Qasim Sultan Yong Soo Cho |
| author_facet | Yeong Jun Kim Qasim Sultan Yong Soo Cho |
| author_sort | Yeong Jun Kim |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-23T23:19:15Z |
| format | Article |
| id | doaj.art-674a3f4a9d7c48e98e666908cb8cc6bf |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-12-23T23:19:15Z |
| publishDate | 2020-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-674a3f4a9d7c48e98e666908cb8cc6bf2022-12-21T17:26:23ZengIEEEIEEE Access2169-35362020-01-018804548046710.1109/ACCESS.2020.29907109079537Pilot Sequence Design for mmWave Cellular Systems With Relay Stations in the Presence of BlockageYeong Jun Kim0Qasim Sultan1Yong Soo Cho2https://orcid.org/0000-0001-7685-9434LG Electronics, Seoul, South KoreaDepartment of Electrical and Electronics Engineering, Chung-Ang University, Seoul, South KoreaDepartment of Electrical and Electronics Engineering, Chung-Ang University, Seoul, South KoreaDue 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.https://ieeexplore.ieee.org/document/9079537/Blockagecellular systemmmWavepilot sequence designrelay |
| spellingShingle | Yeong Jun Kim Qasim Sultan Yong Soo Cho Pilot Sequence Design for mmWave Cellular Systems With Relay Stations in the Presence of Blockage IEEE Access Blockage cellular system mmWave pilot sequence design relay |
| title | Pilot Sequence Design for mmWave Cellular Systems With Relay Stations in the Presence of Blockage |
| title_full | Pilot Sequence Design for mmWave Cellular Systems With Relay Stations in the Presence of Blockage |
| title_fullStr | Pilot Sequence Design for mmWave Cellular Systems With Relay Stations in the Presence of Blockage |
| title_full_unstemmed | Pilot Sequence Design for mmWave Cellular Systems With Relay Stations in the Presence of Blockage |
| title_short | Pilot Sequence Design for mmWave Cellular Systems With Relay Stations in the Presence of Blockage |
| title_sort | pilot sequence design for mmwave cellular systems with relay stations in the presence of blockage |
| topic | Blockage cellular system mmWave pilot sequence design relay |
| url | https://ieeexplore.ieee.org/document/9079537/ |
| work_keys_str_mv | AT yeongjunkim pilotsequencedesignformmwavecellularsystemswithrelaystationsinthepresenceofblockage AT qasimsultan pilotsequencedesignformmwavecellularsystemswithrelaystationsinthepresenceofblockage AT yongsoocho pilotsequencedesignformmwavecellularsystemswithrelaystationsinthepresenceofblockage |