Abstract:According to the ongoing IEEE 802.11ac amendment, the wireless network is about to embrace the gigabit-per-second raw data rate. Compared with previous IEEE standards, this significant performance improvement can be attributed to the novel physical and medium access control (MAC) features, such as multi-user multiple-input multiple-output transmissions, the frame aggregation, and the channel bonding. In this paper, we first briefly survey the main features of IEEE 802.11ac, and then, we evaluate these new feat… Show more
“…The beamformee measures the channel and sends back this information to the beamformer. Consequently, the beamformer can accurately direct each beam to the target receiver [6]. The IEEE 802.11ac has increased the number of spatial streams (SS) up to eight SS at the access point compared to four spatial streams specified by 802.11n.…”
Section: Background and Related Workmentioning
confidence: 99%
“…Using MU-MIMO, an AP can transmit packets concurrently to multiple clients in the same frequency spectrum at the same time (spatial reuse). However, to employ the MU-MIMO efficiently, the IEEE 802.11ac specifies that the maximum number of simultaneous beams directed to different nodes is four [3], [6]. That is, the maximum number of concurrent receivers of a MU-MIMO is four.…”
Section: Background and Related Workmentioning
confidence: 99%
“…In addition, the authors specify some challenges for 802.11ac in order to support higher layers protocols. Alternatively, examining the channel sounding technique used in explicit estimating of channel conditions is reported in [6]. An extended request-to-send/clear-to-send is proposed and integrated with the explicit compressed feedback.…”
Abstract:The introduction of the IEEE 802.11 standard in late 1990s sparked a whole new promising area in wireless communications, allowing computer users to have untethered access to the Internet. Recently, the IEEE 802.11ac amendment for wireless local area networks (WLANs) has been released that achieves very high throughput (VHT) to approximately 6.933 Gbps. Enhancements to the physical and MAC layers are introduced in the IEEE 802.11ac amendment. These enhancements include exploiting wider channel bandwidths, enhancing modulation and coding schemes, using explicit beamforming, and increasing spatial streams along with the breakthrough of multi-user multiinput multi-output (MU-MIMO). This paper presents a performance analysis in terms of throughput of IEEE 802.11ac. Simulation is conducted to examine different features defined in the 802.11ac amendment. We calculate the aggregate system throughput of several proposed simulation scenarios. Results show that 802.11ac system throughput increases with the enhancement of channel size, modulation schemes, and spatial streams.
“…The beamformee measures the channel and sends back this information to the beamformer. Consequently, the beamformer can accurately direct each beam to the target receiver [6]. The IEEE 802.11ac has increased the number of spatial streams (SS) up to eight SS at the access point compared to four spatial streams specified by 802.11n.…”
Section: Background and Related Workmentioning
confidence: 99%
“…Using MU-MIMO, an AP can transmit packets concurrently to multiple clients in the same frequency spectrum at the same time (spatial reuse). However, to employ the MU-MIMO efficiently, the IEEE 802.11ac specifies that the maximum number of simultaneous beams directed to different nodes is four [3], [6]. That is, the maximum number of concurrent receivers of a MU-MIMO is four.…”
Section: Background and Related Workmentioning
confidence: 99%
“…In addition, the authors specify some challenges for 802.11ac in order to support higher layers protocols. Alternatively, examining the channel sounding technique used in explicit estimating of channel conditions is reported in [6]. An extended request-to-send/clear-to-send is proposed and integrated with the explicit compressed feedback.…”
Abstract:The introduction of the IEEE 802.11 standard in late 1990s sparked a whole new promising area in wireless communications, allowing computer users to have untethered access to the Internet. Recently, the IEEE 802.11ac amendment for wireless local area networks (WLANs) has been released that achieves very high throughput (VHT) to approximately 6.933 Gbps. Enhancements to the physical and MAC layers are introduced in the IEEE 802.11ac amendment. These enhancements include exploiting wider channel bandwidths, enhancing modulation and coding schemes, using explicit beamforming, and increasing spatial streams along with the breakthrough of multi-user multiinput multi-output (MU-MIMO). This paper presents a performance analysis in terms of throughput of IEEE 802.11ac. Simulation is conducted to examine different features defined in the 802.11ac amendment. We calculate the aggregate system throughput of several proposed simulation scenarios. Results show that 802.11ac system throughput increases with the enhancement of channel size, modulation schemes, and spatial streams.
“…The data sender can also obtain CSI(Channel State Information) by estimating the training sequence included in MU-CTSs. The saturation throughput S can be calculated as follows [5,9].…”
Section: Figure 5 Markov Chain Model For the Backoff Window Sizementioning
confidence: 99%
“…The previous paper analyzed the IEEE 802.11b/g/a/n MAC performance for wireless LAN with error-free and errorprone channel [3,[5][6][7]. Papers related to IEEE 802.11ac also analyzed MAC throughput, but did not consider mobile ad-hoc and error-prone environment that is applied to most wireless LAN [8][9][10][11]. So, this paper extends the previous IEEE 802.11ac performance researches and analyzes the IEEE 802.11ac MAC performance for mobile ad-hoc LAN under the errorprone channel environment.…”
Abstract-FER (Frame ErrorRate
Ⅰ. INTRODUCTIONOver the past few years, wireless LAN have been deployed rapidly across enterprises, homes, public sectors and service providers due to mobility, flexibility, interoperability and cost-effective deployment. It is expected that wireless LAN have emerged as a promising network for future IP applications. When wireless channel experiences fading, bit errors occur and its performance decreases largely. Also, with the limited frequency resources, designing an effective MAC protocol is a hot challenge. The legacy IEEE 802.11b and 802.11g/a specification provide up to 11 and 54 Mbps data rates, respectively. They employs a CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) protocol with binary exponential back-off as the MAC protocol. IEEE 802.11n allows coexistence with IEEE 802.11b/g/a legacy devices [1]. It delivers a theoretical maximum throughput of 600 Mbps at physical layer and has maximum data throughput of at least 100 Mbps as measured at the MAC SAP(Service Access Point). IEEE 802.11ac is an amendment to IEEE 802.11 for very high throughput (VHT) operation in frequency bands below 6 GHz, excluding 2.4 GHz (i.e., unlicensed bands at 5 GHz band) [2]. The previous researches have been executed on the DCF performance over wireless LAN [3]. ______________________________________________
Ha Cheol Lee Yuhan University KoreaIn case of IEEE 802.11n, the throughput performance at the MAC layer can be improved by aggregating several frames before transmission [4]. Frame aggregation not only reduces the transmission time for preamble and frame headers, but also reduces the waiting time during CSMA/CA random backoff period for successive frame transmissions. Under error-prone channels, corrupting a large aggregated frame may waste a long period of channel time and lead to a lower MAC efficiency. The previous paper analyzed the IEEE 802.11b/g/a/n MAC performance for wireless LAN with error-free and errorprone channel [3,[5][6][7]. Papers related to IEEE 802.11ac also analyzed MAC throughput, but did not consider mobile ad-hoc and error-prone environment that is applied to most wireless LAN [8][9][10][11]. So, this paper extends the previous IEEE 802.11ac performance researches and analyzes the IEEE 802.11ac MAC performance for mobile ad-hoc LAN under the errorprone channel environment. In Section 2, IEEE 802.11ac PHY and MAC layer are reviewed. In Section 3 and Section 4, saturation throughput with bit errors appearing in the wireless channel are numerically analyzed and evaluated. In Section 5, it is concluded with remarks.
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