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A Method of Spectrum Sensing Via
Radio Identification
Researchers at the University of South Florida have
developed a novel spectrum sensing method to
identify the unused portion of the RF spectrum for
opportunistic exploitation.
Advantages:


Computationally simple and fast.
Provides a robust and reliable sensing
method that covers multiple dimensions of
the spectrum space.
Can be used for electronic surveillance to
detect illegal or enemy signals.
The detected transmissions can be classified
as single-carrier or multi-carrier.
Cognitive radio is a new paradigm in wireless
communications which aims to employ intelligent and

adaptive wireless devices to effectively exploit the
unused portion of the spectrum. Spectrum sensing
which involves detection of the primary user, is one of

the most challenging tasks in cognitive radio systems.
These devices should be able to identify the unused
spectrum in a fast and efficient way to catch
up with dynamically changing
Opportunistic Cognitive
transmission parameters. However,
conventional algorithms sense the
Using OFDM
spectrum without exploiting all the
properties of primary users.
Radio
Our inventors have developed a sensing
method, termed as partial match-filtering, for
identifying the unused spectrum by estimating
the RF properties of primary users. In this
method, the primary users are identified by
matching the a prior information about their
transmission characteristics to the features
extracted from the received signal. The
algorithm is realized by (1) Extraction of a
predefined set of parameters/features from
the received signal (2) Using the extracted
features for making decisions on the presence
of an anticipated transmission, and (3)
Exploring the gained knowledge about the
active primary users for multi-dimensional
spectrum characterization. Specifically, it
provides an algorithm for identifying various
Orthogonal Frequency Division Multiplexing (OFDM) Block Diagram of the Partial Match-filtering Algorithm
signals and estimating their transmission
parameters namely symbol duration, cyclic prefix
(CP) length, number and frequencies of sub-carriers
and nominal bandwidth blindly using characteristics of
OFDM transmission.
Tech ID # 07A051
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