White Space Internet Device By: Sean Iveson William Sadler

Introduction Product: Wireless White Space "Hot-Spot" Internet Device Objective: Provide fast and free internet to the general public How: Software Defined Radio Market: New market in the existing market of wireless technology 3 Different models to fulfill the objective o Wireless o USB o Ethernet

Components Device Components (software defined radio) o Reception Antenna o Variable Band-Pass Filter o Analog-to-Digital Converter o Digital Signal Processor o Colorless LCD Display (w/ backlight) o Digital-to-Analog Converter o Low-Pass Filter o Transmission Antenna Model 1 Design

Alternate Design A Components Needed USB Connection Alternate Design Model

Alternate Design B Components Needed Ethernet Port o Special algorithm needed to transmit data effectively Alternate Design Model

Reception Antenna White space range: MHz MIMO o creates coupling effect between closely packed antennas o decoupling techniques IEEE o directional link antenna o omni-directional sensing antenna o lower data transfer rate, high range o miles IEEE af o range comparable to normal o higher speeds compared to

Reception Antenna Suspended Strip increases isolation and matches impedances. Antennas must be in different orientations.

Cognitive Radio IEEE and af are among the first CR standards FCC reports sporadic use of spectrum allows for fair sharing and use without interference requires a separate antenna for spectrum sensing

Variable Band-Pass Filter Must have variable capability Made using high-pass and low-pass filters Captures the desired frequency from the range of possible frequencies Note: When implementing A/D converter, converter must operate at 2x the frequency of the signal being received

Digital Signal Processor Special Algorithm Implemented to separate the data signal from all other signals received at the desired frequency o Decomposition with regard to approximate space and detail space o Further decomposition - dividing signal into sub-bands (splits frequency equally) o Power measurement of each sub-band o Energy detection algorithm  Easily select unoccupied candidate channels  Reduced complexity of transform function

Colorless LCD Display Displays o Connectivity information  Connection Quality  Frequency of Signal to be/being received o Number of users connected o Remaining battery power in device

Second Antenna IEEE n WLAN works with most possible devices fast enough to prevent bottle necking

Conclusion all in one design receives af and Cognitive Radio makes this possible provides hotspot for use with all wifi capable devices