1. An Agile and Efficient MAC for Wireless Access over TV Whitespaces
Abstract:
The FCC mandate of allowing TV Whitespaces for unlicensed access has
the potential for dramatic improvements in wireless access data rates. We
argue that an ideal MAC should account for diverse user-location and
spectrum dependent channel rates to provide fair data rates and efficient
utilization. Furthermore, due to limited tunable bandwidth of a radio and
fragmented spectrum, the AP should support multiple radios. We make
the following contributions by designing a MAC for wireless LAN access
over TV Whitespace. (i) We propose an architecture and beaconing
mechanism to enable such a MAC. Our MAC is an evolution of 802.11
MAC. (ii) We propose an algorithm that chooses the Whitespaces for the
different radios of the AP and assigns clients to the radios. Our algorithm
has provable guarantee and is near-optimal in many scenarios. (iii)
Extensive simulation over OMNET platform demonstrates the benefit of
our design over a frequency and client-location agnostic Wi-Fi-like MAC.
The typical throughput gain is 30-76 percent, whereas, the reduction in
collisions is up to 80 percent. (iv) We implemented a proof-of-concept
prototype (by modifying madWiFi drivers) that demonstrates feasibility of
our design, robustness to temporal variation of available spectrum, and
system throughput.

2. Existing System:
The FCC ruling is significant because the TV spectrum is located in the
VHF (50-174 MHz) and UHF (512-698 MHz) bands which are significantly
better propagation bands than current cellular and WiFi spectrum.
Moreover several studies estimate that the available spectrum could range
from a few tens of megahertz in crowded urban areas to over 100 MHz in
sub-urban and rural areas.
The ruling allowed two types of access:
(i) Infrastructure based, cellular type access which could range across
the entire TV band.
(ii) Short range WLAN like access in the UHF band, apart from
channel 37.
Design of a standard for the first type of access is being actively worked
upon by the IEEE 802.22 group. The WLAN type of access has garnered
intense interest from several key players from the industry (Google,
Microsoft, Dell, etc.) who have banded together to form the Whitespace
Coalition.
Proposed System:

3. The FCC recommendation clearly states that TV Whitespace networks
should not interfere with television reception. Furthermore wireless
microphones have operated in this spectrum for several years now, hence
these devices should not be affected by Whitespace networks either.
In a recent ruling the FCC mandated the use of a geo-location database that
would specify the un-utilized spectrum in any given location. Further the
FCC set aside two channels for use by wireless microphones. The
geolocation database completely eliminates the need for sensing for
television channels.
However, there will still be issues relating to wireless microphones for the
following reasons.
First several legacy microphones will continue to operate in spectrum other
than the two channels set aside by the FCC.
Second, in large entertainment venues, sports stadiums, etc., the two
channels set aside for microphones may be inadequate and wireless
microphones may have to spill into other Whitespace spectrum.
Therefore, detecting and avoiding wireless microphones is a problem that
will persist in TV Whitespaces.
Hardware Requirements:
• System : Pentium IV 2.4 GHz.
• Hard Disk : 40 GB.
• Floppy Drive : 1.44 Mb.
• Monitor : 15 VGA Colour.

4. • Mouse : Logitech.
• RAM : 256 Mb.
Software Requirements:
• Operating system : - Windows XP.
• Front End : - JSP
• Back End : - SQL Server
Software Requirements:
• Operating system : - Windows XP.
• Front End : - .Net
• Back End : - SQL Server