MIMO-Based Collision Avoidance in IEEE 802.11e Networks

Ashtaiwi, Abduladhim; Hassanein, Hossam S.

doi:10.1109/tvt.2009.2026177

Cited by 11 publications

(7 citation statements)

References 17 publications

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“…Meanwhile, considerable effort was devoted to theoretical analysis of the performance of the 802.11 DCF [4][5][6][7][8] and enhanced DCF [9][10][11][12][13][14][15][16][17]. Deng and Chang [4] proposed a priority scheme by differentiating the backoff window: the higher priority class uses the window [0, 2i+1-1] and the lower priority class uses the window [2i+1, 2i+2-1] , where i is the backoff stage.…”

Section: Introductionmentioning

confidence: 99%

“…In the related literature, there have been numerous studies to improve the performance of the EDCF mechanism. The analytical models proposed in [12][13][14][15] demonstrated that the performance of the DCF strongly depends on the minimum contention window (CW) and the number of contending nodes. Cali et al [16] proposed a distributed algorithm that enables nodes to estimate the number of contending nodes and then to tune their CW to an optimal value.…”

Section: Introductionmentioning

confidence: 99%

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Performance Analysis of Priority Schemes for IEEE 802.11e Wireless Local Area Networks Using Multiple Flows Distributed Weighted Fair Queuing Algorithm

Weng¹,

Hung²

2014

ujcn

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In this paper, a novel and simple search algorithm called distributed weighted fair queuing (DWFQ) algorithm is proposed for the quality-of-service (QoS) in IEEE 802.11e wireless local area networks (WLANs). We first propose that the IEEE 802.11e enhanced distributed coordination function (EDCF) is an efficient algorithm to support the QoS in WLANs, although it can provide more bandwidth to packets with higher priority. However, when the system under heavy traffic load situation, IEEE 802.11e EDCF can't guarantee the fair allocation of excess bandwidth of each access categories (ACs), i.e., under heavy traffic load, EDCF guarantees the QoS of packets with higher priority by reducing the QoS of packets with lower priority. This paper discuses an EDCF scheme, in order to distribute bandwidth fairly among different ACs under heavy traffic load situation in WLAN, we propose multiple flows DWFQ algorithm. This algorithm not only supports the concept of differentiating ACs with different priorities but also guarantees the fair allocation of each ACs according to their relative weights. Furthermore, in this propose a mechanism to resolve the overload situation problem and doubling contention window (CW) method to reduce the collision probability. The simulations performed show that multiple flows DWFQ with doubling CW method which can perform an attractive performance even under heavy traffic load.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Priority Schemes for IEEE 802.11e Wireless Local Area Networks Using Multiple Flows Distributed Weighted Fair Queuing Algorithm

Weng¹,

Hung²

2014

ujcn

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“…The proposed MRS protocol opens up some new research directions for many bandwidth management schemes in WLANs and ad hoc networks. In , initial results on the spatial channels sharing concept in wireless mesh networks links were reported for concurrently meeting different data rate demand of different connections. Unlike in , however, in this work, we broadly expose the spatial channels sharing concept to a wider network characteristics, and we also highlight the potential capabilities of the proposed algorithm to improve the overall system usability.…”

Section: Introductionmentioning

confidence: 99%

“…In , initial results on the spatial channels sharing concept in wireless mesh networks links were reported for concurrently meeting different data rate demand of different connections. Unlike in , however, in this work, we broadly expose the spatial channels sharing concept to a wider network characteristics, and we also highlight the potential capabilities of the proposed algorithm to improve the overall system usability. The performance of the MRS is evaluated using OPNET (OPNET Technologies, Inc., Bethesda, MD, USA) interfaced with MATLAB (The MathWorks Inc., Natick, MA, USA) for various scenarios for different values of requested rates, interference zones, and different communication environments.…”

Section: Introductionmentioning

confidence: 99%

IEEE 802.11 medium access control enhancements based on simultaneous multiple‐input multiple‐output bandwidth sharing

Ashtaiwi

Sulyman

Hassanein

2012

Wireless Communications

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The demand for higher data rate has spurred the adoption of multiple-input multiple-output (MIMO) transmission techniques in IEEE 802.11 products. MIMO techniques provide an additional spatial dimension that can significantly increase the channel capacity. A number of multiuser MIMO system have been proposed, where the multiple antenna at the physical layer are employed for multiuser access, allowing multiple users to share the same bandwidth. As these MIMO physical layer technologies further evolve, the usable bandwidth per application increases; hence, the average service time per application decreases. However, in the IEEE 802.11 distributed coordination function-based systems, a considerable amount of bandwidth is wasted during the medium access and coordination process. Therefore, as the usable bandwidth is enhanced using MIMO technology, the bandwidth wastage of medium access and coordination becomes a significant performance bottleneck. Hence, there is a fundamental need for bandwidth sharing schemes at the medium access control (MAC) layer where multiple connections can concurrently use the increased bandwidth provided by the physical layer MIMO technologies. In this paper, we propose the MIMO-aware rate splitting (MRS) MAC protocol and examine its behavior under different scenarios. MRS is a distributed MAC protocol where nodes locally cooperate with one another to share bandwidth via splitting the spatial channels of MIMO systems. Simulation results of MRS protocol are obtained and compared with those of IEEE 802.11n protocol. We show that our proposed MRS scheme can significantly outperform the IEEE 802.11n in medium access delay and throughput.

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“…MIMO has the advantage of having many antennas and advanced signal processing technologies [3]. Using this technology, a large number of data streams can be transmitted or received independently via MIMO antennas [4]. The main problem with MIMO technology is interference from neighboring antennas.…”

mentioning

confidence: 99%

Reconfigurable Design of Hybrid MIMO Detection Scheme for Spatially Multiplexed MIMO System

Basha¹

2021

Preprint

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In recent years, Multiple Input- Multiple Output (MIMO) has been used to expand data transfer for ensuring consistency. The transmitter and receiver use several antennas and they can achieve high spectral characteristics. However, as the numbers of users and antennas increase rapidly, the complexity of the system increases and it becomes a major problem in many detection systems. It is important to develop sophisticated components to improve compliance with many standards without compromising Bit Error Rate (BER) performance of the components. The proposed work introduces a New Hybrid MIMO Detector (NHMD), which provides the solution for the complicated design procedure. In this proposed method an Optimal Differential Evolution (ODE) algorithm has been designed to select multiple detection detectors. In addition, this method uses a parallel processing to reduce the amount of arithmetic logic. The proposed NHMD method is implemented for cylindrical devices belonging to different FPGA families with different antenna configurations (2 × 2, 4 × 4). The proposed NHMD method provides superior quality by combining multiple detectors. The simulation results confirm that the NHMD method uses low equipment as well as low power consumption and provides high efficiency without affecting BER performance.

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MIMO-Based Collision Avoidance in IEEE 802.11e Networks

Cited by 11 publications

References 17 publications

Performance Analysis of Priority Schemes for IEEE 802.11e Wireless Local Area Networks Using Multiple Flows Distributed Weighted Fair Queuing Algorithm

Performance Analysis of Priority Schemes for IEEE 802.11e Wireless Local Area Networks Using Multiple Flows Distributed Weighted Fair Queuing Algorithm

IEEE 802.11 medium access control enhancements based on simultaneous multiple‐input multiple‐output bandwidth sharing

Reconfigurable Design of Hybrid MIMO Detection Scheme for Spatially Multiplexed MIMO System

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