Patent ID: 8717922
Filing Date: 2014-05-06
Classification: H04L,H04W

Abstract:
1. A method for detecting spectrum holes for use in cognitive radio secondary transmissions comprising: receiving an indication of an assignment of a set of subcarriers to a primary user; obtaining a set of samples; determining multitaper spectral estimates for at least a subset of the set of subcarriers based on the assignment of the set of subcarriers to the primary user by processing samples of the set of samples for the at least a subset of the set of subcarriers and by applying a set of orthogonal tapers to the set of samples to obtain taper spectral estimators for each subcarrier in the at least a subset of the set of subcarriers; determining a total number of samples that is obtained by said obtaining a set of samples, a total number of orthogonal tapers in the set of orthogonal tapers applied to the set of samples, and a total number of subcarriers in the at least a subset of the set of subcarriers by performing a heuristic process, wherein the determining the total number of samples, the total number of orthogonal tapers and the total number of subcarriers is based on a pre-determined target miss detection probability and a pre-determined target false alarm probability; comparing a test statistic that is based on the multitaper spectral estimates to a threshold to determine whether the set of subcarriers is utilized for primary transmissions to the primary user; and receiving data signals on at least one of the subcarriers in the set of subcarriers if the set of subcarriers is not utilized for primary transmissions to the primary user.