Beamforming Transmission in IEEE 802.11ac under Time-Varying Channels

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 ov...

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Main Authors: Heejung Yu, Taejoon Kim
Format: Article
Language:English
Published: Wiley 2014-01-01
Series:The Scientific World Journal
Online Access:http://dx.doi.org/10.1155/2014/920937
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author Heejung Yu
Taejoon Kim
author_facet Heejung Yu
Taejoon Kim
author_sort Heejung Yu
collection DOAJ
description 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.
format Article
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institution Kabale University
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publishDate 2014-01-01
publisher Wiley
record_format Article
series The Scientific World Journal
spelling doaj-art-70c0c9d80e304ce1b48dfa644dc918652025-02-03T01:00:51ZengWileyThe Scientific World Journal2356-61401537-744X2014-01-01201410.1155/2014/920937920937Beamforming Transmission in IEEE 802.11ac under Time-Varying ChannelsHeejung Yu0Taejoon Kim1Department of Information and Communication Engineering, Yeungnam University, Gyeongsan 712-749, Republic of KoreaSchool of Information and Communication Engineering, Chungbuk National University, Cheongju 361-763, Republic of KoreaThe 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.http://dx.doi.org/10.1155/2014/920937
spellingShingle Heejung Yu
Taejoon Kim
Beamforming Transmission in IEEE 802.11ac under Time-Varying Channels
The Scientific World Journal
title Beamforming Transmission in IEEE 802.11ac under Time-Varying Channels
title_full Beamforming Transmission in IEEE 802.11ac under Time-Varying Channels
title_fullStr Beamforming Transmission in IEEE 802.11ac under Time-Varying Channels
title_full_unstemmed Beamforming Transmission in IEEE 802.11ac under Time-Varying Channels
title_short Beamforming Transmission in IEEE 802.11ac under Time-Varying Channels
title_sort beamforming transmission in ieee 802 11ac under time varying channels
url http://dx.doi.org/10.1155/2014/920937
work_keys_str_mv AT heejungyu beamformingtransmissioninieee80211acundertimevaryingchannels
AT taejoonkim beamformingtransmissioninieee80211acundertimevaryingchannels