Ad hoc networking with directional antennas: a complete system solution

Statistical channel models based on BER performance are presented for a frequency-and time-selective vehicle-to-vehicle wireless communications link in an expressway environment in Atlanta, Georgia, where both vehicles traveled in the same direction. The models are developed from measurements taken using the direct sequence spread spectrum (DSSS) technique at 2.45 GHz. A collection of tapped delay line models, referred to as a "partitioned" model in the paper, is developed to attempt to capture the extremes of BER performance of the recorded channel. Overall and partition models are compared to the recorded channel in terms of the BER statistics obtained when the channels are inserted in a dedicated short range radio (DSRC) standard simulation system. The quality of the match between synthesized and recorded channel BER statistics is analyzed with respect to type of modulation (fixed or adaptive), the frame length, and the length of the interval over which the BER was calculated.

Section: N I T I a L T A P C H A R A C T E R I Z A T I O Nmentioning

confidence: 99%

“…MANET applications include battleground communications [2], mobile sensor networks [3,4], and Intelligent Transportation Services [6]. For the latter application, the dedicated short range radio (DSRC) standard (802.11p) [7] has been developed.…”

Section: Introductionmentioning

confidence: 99%

A BER-Based Partitioned Model for a 2.4GHz Vehicle-to-Vehicle Expressway Channel

Acosta-Marum

Ingram

2006

“…This information helps the transmitting nodes to beam-form in the direction of the receiver so that the gain is maximized [5,28]. Exact location information reduces the effect of interference from other nodes to a large extent.…”

Section: Issues With Directional Antennasmentioning

confidence: 99%

A Novel Multi-channel MAC Protocol for Directional Antennas in Ad Hoc Networks

Khatiwada¹,

Moh

2014

In recent years, the employment of directional antennas in ad hoc networks has increased significantly. In this paper, we propose a multi-channel MAC protocol for directional antennas (MCMDA) for IEEE 802.11 based ad hoc networks. To improve the network performance, the so-called hidden terminals and deafness should be decreased as much as possible. In MCMDA, not only multiple channels are effectively utilized but also vertically opposite clear-to-send is employed to minimize the effects of hidden terminals and deafness. Each node is equipped with multiple interfaces for multiple directional antennas such that concurrent transmissions and receptions take place in a node at the same time, resulting in further improvement of the network capacity. The performance study based on extensive computer simulation shows that the proposed MCMDA achieves significant performance improvement in comparison to the conventional directional MAC as well as IEEE 802.11 distributed coordination function in terms of network throughput and end-to-end delay.

“…Unfortunately, directional transmissions increase the hidden terminal problem, the problem of deafness and the problem of the determination of neighbors' location. These problems are researched and discussed in [2,6,12,21]. Choudhury and Vaidya [6] have proposed the ToneDMAC to address the deafness problem; Korakis et al [12] have used circular directional RTS to determine neighbors' location.…”

Section: Introductionmentioning

confidence: 99%

A Shoelace-Based QoS Routing Protocol for Mobile Ad Hoc Networks Using Directional Antenna

Chen

Hsu

Jan

2009

In this paper, we propose a new quality-of-service (QoS) routing protocol for mobile ad hoc network (MANET) using directional antennas. The proposed scheme offers a bandwidth-based routing protocol for QoS support in MANET using the concept of multipath. Our MAC sub-layer adopts the CDMA-over-TDMA channel model. The on-demand QoS routing protocol calculates the end-to-end bandwidth and allocates bandwidth from the source node to the destination node. The paths are combined with multiple cross links, called shoelace, when the network bandwidth is strictly limited. Due to the property of the directional antenna, these cross links can transmit data simultaneously without any data interference. We develop a shoelace-based on-demand QoS routing protocol by identifying shoelaces in a MANET so as to construct a QoS route, which satisfied the bandwidth requirement, more easily. The shoelace-based route from the source to the destination is a route whose sub-path is constructed by shoelace structure. With the identified shoelaces, our shoelace-based scheme offers a higher success rate to construct a QoS route. Finally, simulation results demonstrate that the proposed routing protocol outperform existing QoS routing protocols in terms of success rate, throughput, and average latency.