IEEE 802.11a Throughput Performance with Hidden Nodes
ABSTRACT Analytic performance of IEEE 802.11 distributed coordination function that takes into account hidden node problem and unsaturated traffic condition is presented for symmetric networks. This enables us to estimate the performance of practical wireless local area networks more accurately. It is shown that the presence of hidden nodes barely affects the network performance in low traffic conditions, but it causes 33% performance loss in moderate traffic scenarios. Analytical results presented in the paper are backed by simulation results.
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ABSTRACT: Due to its usefulness and wide deployment, IEEE 802.11 has been the subject of numerous studies, but still lacks a complete analytical model. Hidden terminals are common in IEEE 802.11 and cause the degradation of throughput. Despite the importance of the hidden terminal problem, there have been a relatively small number of studies that consider the effect of hidden terminals on IEEE 802.11 throughput, and many are not accurate for a wide range of conditions. In this paper, we present an accurate new analytical saturation throughput model for the infrastructure case of IEEE 802.11 in the presence of hidden terminals. Simulation results show that our model is accurate in a wide variety of cases.IEEE/ACM Transactions on Networking 01/2012; 20(2):557-570. · 2.01 Impact Factor
Conference Paper: Performance Analysis of IEEE 802.11ac DCF with Hidden Nodes[Show abstract] [Hide abstract]
ABSTRACT: Recently, the IEEE 802.11 standard based Wireless Local Area Networks (WLAN) have become more popular and are widely deployed. It is anticipated that WLAN will play an important rule in the future wireless communication systems in order to provide several gigabits data rate. IEEE 802.11ac is one of the ongoing WLAN standard aiming to support very high throughput (VHT) with data rate of up to 6 Gbps below the 6 GHz band. In the development of IEEE 802.11ac standard, several new physical layer (PHY) and medium access control layer (MAC) features are taken into consideration, such as employing wider bandwidth in PHY and incrementing the limits of frame aggregation in MAC. However, due to the newly introduced features, some traditional techniques used in previous standards could face some problems. This paper presents a performance analysis of 802.11ac Distributed Coordination Function (DCF) in presence of hidden nodes in overlapping BSS (OBSS) environment. The effectiveness of DCF in IEEE 802.11ac WLAN when using different primary channels and different frequency bandwidth has also been discussed. Our results indicate that the traditional RTS/CTS handshake mechanism faces shortcomings and needs to be modified in order to support the newly defined 802.11ac amendment.Vehicular Technology Conference (VTC Spring), 2012 IEEE 75th; 01/2012
Conference Paper: Performance comparison of 802.11 DCF in fading with OFDM and diversity[Show abstract] [Hide abstract]
ABSTRACT: Performance of IEEE 802.11 distributed co-ordination function (DCF) Medium Access Control (MAC) significantly degrades in fading channel conditions because of both collisions and fading. In order to enhance the system performance in these circumstances, multiple antenna systems and Orthogonal Frequency Division Multiplexing (OFDM) are used at physical layer. In this paper an interlayer analysis is performed between physical layer and MAC layer to investigate the throughput performance of WLAN. The system is simulated using Orthogonal Frequency Division Multiplexing (OFDM) without diversity, OFDM with Selection Combining (SC) and Maximal Ratio Combining (MRC). At physical layer Bit Error Rate (BER) for different physical (PHY) layers is simulated and calculated Packet Error Rate (PER) plotted as a function of bit energy to noise power (Eb/No). DCF is simulated taking account of channel fading and performance of MAC layer is evaluated in terms of throughput. Results find that OFDM with diversity gives better performance in terms of PER and throughput, as compared to physical layers without diversity. These outcomes can be used to select a particular PHY layer technique for WLAN under fading channel conditions.Wireless and Optical Communications Networks (WOCN), 2012 Ninth International Conference on; 01/2012