Estimation of Optimal Frequency and Antennae Length between Resource Interface and Mobile Terminal in Wireless ATM
Abstract
Wireless communication involves transmission through the air with possibility of wide area coverage. Major issues that affect data transmission in a wireless environment includes the integrity of the transmitted data and the attenuation in the transmission medium imposed through geographical coverage. In this study, a scalable solution was proposed for wireless transmission between a mobile terminal and a network printer.
The transmission modules, which include power supply, transmitter and the receiver were specified and designed using modular approach. The parameters, which determine the magnitude of attenuation experienced by the wireless transmission, were specified. The simulation was carried out using Microsoft Visual Basic 5.0 to determine the antennae length for a particular separation and transmission frequency. The maximum distance between the receiver and the transmitter was determined based on the antennae length and transmission frequency. To achieve realistic communication (at an attenuation of 72.95dB) at an antenna separation of 5km and 10km respectively the frequency was set below 172kHz and 87.4kHz and the necessary antenna length was set to 0.37m and 1.47m respectively.
The result of the simulation shows that any transmission frequency below 106MHz would be suitable for setting up a point-to-point link between the mobile terminal and the printer. It was observed that attenuation varies inversely with both the antenna separation and the transmission frequency.
The approach was found to support dynamic mobile terminal movement within a wider geographical range when its distance from the receiving antenna is very large without experiencing appreciable changes. Also attenuation changes with a varying high frequency transmission are negligible.
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