17-09-2012, 12:54 PM
Wireless Radio:SHARC
SHARCFallDec15.ppt (Size: 2.36 MB / Downloads: 49)
ABSTRACT
Design and implement a wireless communication network consisting of multiple sensors and one central receiving node.
Conduct a comparative study of wireless communication components currently available.
Purpose
Many applications in both civilian and military environments require multiple sensing devices for collecting and monitoring data.
These sensors should not be made for processing the data. Rather the sensors should send the data to a central receiving unit whose responsibility is to analyze the received information.
This would make the sensors affordable, minimal in power consumption, and less complex in design, thus making them more deployable.
Possible Applications
Military: Sensors can be designed to monitor acoustic activity near a road of possible enemy movement. Because of low power consumption numerous sensors can be deployed to monitor large areas. The central receiving unit can process the data and provide a map of enemy movements.
Civilian: This could be used to monitor your property. The receiving unit can alert authorities incase fire breaks out or there is suspicious activity.
Design Alternatives
There are two readily available methods for implementing our design.
Digital - This method involves digital communication chipsets which are widely available in the market.
Analog - This method is familiar to us and is also much simpler to implement. However, the components are not easily accessible.
Digital Design
We are currently looking at Chipcon module CC2500 for possible implementation for SHARC.
The CC2500 is a transceiver circuit, we intend to implement it for the two sensors and the central node.
For the two sensors, we are going to restrict them to sending data. This capability of using CC2500 in only transmit mode is built in.
The system is programmable in terms of modulation, power output, operation frequency and many other features we might be able to use.
Circuit Description
The digital design will consist of multiple transmitters CC2500 and of a custom built receiver.
Since each node transmits continuously, the receiver will be made of multiple receivers that corresponds to each node’s channel. One main antenna will be used to receive all channels in the 2474.5 00~ 2478.000 MHz range where the CC2500 modules will serve as the filters to separate each channel.
A series of impedance matching to each of the CC2500 and the antenna will be necessary.
The receiver can easily be expanded to receive information from more nodes with a simple addition of an extra inexpensive receiver module.
The time stamping will occur at every packet, every other packet, every tenth packet or any other optimum packet interval.
A Frequency Division Multiplexing will be used to modulate the generated binary clock with the signal.
Determination of Best Design
After both the Analog and Digital circuits are implemented, they will be tested particularly for power consumption at the sensors, continuous transmission, dynamic range, and accommodation for timestamp.
Based on the results of the test, the design that is delivered will depend on the recommendations of the SHARC team, Prof. Bansal and critically acceptance by our sponsor Rick Silva.