ICT기반 스마트기기 창의인재양성 사업팀의 논문/저서입니다.
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[유희정교수님]Heejung Yu and Taejoon Kim, “Beamforming Transmission in IEEE 802.11ac under Time-Varying Channels,” The Scientific World Journal, vol. 2014, Article ID 920937, 11 pages, 2014. doi:10.1155/2014/920937 |
| 글쓴이 |
관리자 |
| 작성일 |
2014.08.04 |
조 회 |
819 |
Heejung Yu and Taejoon Kim, “Beamforming Transmission in IEEE 802.11ac under Time-Varying Channels,” The Scientific World Journal, vol. 2014, Article ID 920937, 11 pages, 2014. doi:10.1155/2014/920937
Abstract
The IEEE 802.11ac wireless local area network (WLAN) standard has adopted beamforming (BF) schemes to improve spectral efficiency and throughput with multiple antennas. To design the transmit beam, a channel sounding process to feedback channel state information (CSI) is required. Due to sounding overhead, throughput increases with the amount of transmit data under static channels. Under practical channel conditions with mobility, however, the mismatch between the transmit beam and the channel at transmission time causes performance loss when transmission duration after channel sounding is too long. When the fading rate, payload size, and operating signal-to-noise ratio are given, the optimal transmission duration (i.e., packet length) can be determined to maximize throughput. The relationship between packet length and throughput is also investigated for single-user and multiuser BF modes.
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