Patent ID: 9143193
Filing Date: 2015-09-22
Classification: H04B,H04L,H04W

Abstract:
1. A radio circuit including a processor, the processor comprising a memory that includes instructions which when executed create a full spectrum receiver and a white space classifier, wherein the instructions configure the full spectrum receiver to: receive an analogue radio signal comprising multiple channels within a frequency band; transform the analogue radio signal to a digital radio signal; and transform the digital radio signal from a time domain signal to a frequency domain signal, and wherein the instructions configure the white space classifier to identify a plurality of unused channels within the frequency band using the frequency domain signal derived from the analogue radio signal and selecting one of the plurality of unused channels that has been used more recently than at least one of the remaining of the plurality of unused channels as a candidate channel for transmission, wherein the instructions further configure the processor to: utilise cyclostationary feature detection in order to identify unused channels; determine a power spectral density of the radio signal over at least part of the frequency band and to identify portions of the frequency bands with a power spectral density below a threshold value as white space; identify a continuous region of white space in the frequency domain; calculate the width of the region of white space; and determine if the width of the continuous region of white space provides sufficient bandwidth to provide a channel on which a transmitter may transmit.