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PERFORMANCE OF RECONFIGURABLE ANTENNAS IN A BELOW DECKS ENVIRONMENT
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PERFORMANCE OF RECONFIGURABLE ANTENNAS IN A BELOW-DECKS ENVIRONMENT

Category : Communication


Sub Category : MIMO-OFDM


Project Code : ITCM05


Project Abstract

Reconfigurable antennas have been proposed for mitigating multipath   interference and  increasing channel capacity in wireless networks. The majority of studies  which have  investigated  these claims do so either in simulation or through the use of software  defined  radios in lab or office  environments. There has been little work in quantifying experimentally the performance gains of a reconfigurable antenna in highly metallic environments representative of military and industrial applications. This letter quantifies the performance gains provided by the use of electrically reconfigurable antennas in the place of omni directional antennas given varying environmental and system configurations. Wireless measurements for various 802.11-like physical layers were performed in a set of multi deck, coupled compartments aboard Thomas S. Gates (CG 51), a decommissioned Ticonderoga-class U.S. Navy cruiser. The reconfigurable antennas were observed to provide higher channel capacities than omni directional antennas. When the bulkhead doors connecting the coupled compartments were left open, the post processing signal to noise ratio (PP-SNRs) of signals received from reconfigurable antennas were up to 4 dB higher than what was observed when using omni directional antennas. As the compartments became less electrically coupled (i.e., bulkhead doors were closed), the benefit provided via the antenna    pattern diversity of the reconfigurable antennas diminished.

EXISTING SYSTEM

PROPOSED SYSTEM

EXISTING  CONCEPT:

In the existing system it is focused on received power and path loss, as well as the effects of opening/closing doors. This study measured the received power, power delay profile, and RMS delay spread of a wireless channel over multiple decks of a merchant ship. This measurements  were used to estimate coherence  bandwidth and delay spread, which can be used to calculate the maximum rate at which narrow band communication techniques can transmit data without experiencing inter-symbol interference (ISI). Received power estimates were also used to evaluate the impact of deploying a wireless relay in a lift shaft aboard the ship.

PROPOSED CONCEPT:

        The proposed system uses Orthogonal Frequency-Division Multiplexing (OFDM) with omni directional antenna and the LWA. which is suitable for this type of environment as a means to mitigate frequency selectivity that may reduce the role of coherence bandwidth as a limiting factor in wireless communications throughput. Multiple-input–multiple-output (MIMO) communications and multiple antenna techniques can also improve radio performance by exploiting spatially uncorrelated fading of wireless channels common in multipath-rich environments to improve throughput and reliability

EXISTING TECHNIQUE :

Narrow band communication technique

PROPOSED TECHNIQUE:

        OFDM and omni directional antenna and the LWA techniques is used.

TECHNIQUE DEFINITION:

         Narrow band communication technique is used which can transmit data without experiencing inter-symbol interference (ISI).

TECHNIQUE DEFINITION:

         MIMO communication and omni directional antenna and the LWA techniques can also improve radio performance by exploiting spatially uncorrelated fading of wireless channels

DRAWBACKS:

 Desired throughput is  not achieved

 Decreases the network performance.

Shannon channel capacity is not measured..

ADVANTAGES:

        Desired throughput is achieved

 Improves network performance

         Shannon channel capacity is not measured


 
 
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