Spectrum sensing for OFDM signals by utilizing pilot tones
First Claim
Patent Images
1. A method for use in a wireless endpoint, the method comprising:
- selecting one of a number of channels;
downconverting a received signal on the selected channel for providing received orthogonal frequency division multiplexed (OFDM) symbols, each OFDM symbol comprising N>
1 subcarriers at least some of which are pilot subcarriers;
correlating the received OFDM symbols for providing at least one correlated value;
generating a metric value as a function of the at least one correlated value; and
comparing the metric value to a threshold value for detecting if an incumbent signal is present,wherein the metric value is represented by a parameter T, where T is one of;
4 Assignments
0 Petitions
Accused Products
Abstract
An apparatus comprises a downconverter for providing a signal that may be a received orthogonal frequency division multiplexed (OFDM) symbols from a selected channel, each OFDM symbol comprising N subcarriers at least some of which are pilot subcarriers; and a processor that (a) correlates the received OFDM symbols for providing at least one correlated value, (b) generates a metric value as a function of the at least one correlated value and (b) compares the metric value to a threshold value for detecting if an incumbent signal is present.
19 Citations
12 Claims
-
1. A method for use in a wireless endpoint, the method comprising:
-
selecting one of a number of channels; downconverting a received signal on the selected channel for providing received orthogonal frequency division multiplexed (OFDM) symbols, each OFDM symbol comprising N>
1 subcarriers at least some of which are pilot subcarriers;correlating the received OFDM symbols for providing at least one correlated value; generating a metric value as a function of the at least one correlated value; and comparing the metric value to a threshold value for detecting if an incumbent signal is present, wherein the metric value is represented by a parameter T, where T is one of; - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. Apparatus comprising:
-
a downconverter for providing received orthogonal frequency division multiplexed (OFDM) symbols from a received signal on a selected channel, each OFDM symbol comprising N>
1 subcarriers at least some of which are pilot subcarriers; anda processor that (a) correlates the received OFDM symbols for providing at least one correlated value, (b) generates a metric value as a function of the at least one correlated value and (b) compares the metric value to a threshold value for detecting if an incumbent signal is present, wherein the metric value is represented by a parameter T, where T is one of; - View Dependent Claims (8, 9, 10, 11, 12)
-
Specification