Patent ID: 7245930
Filing Date: 2007-07-17
Classification: H04B

Abstract:
1. A method for enabling synchronization of a communications terminal in a wireless communication system comprising: receiving a burst at a receiver of the communications terminal, the burst containing a composite waveform including two or more component waveforms, wherein each of the two or more waveforms has a known frequency variation throughout the burst; estimating a frequency offset and a timing offset of said composite waveform as received into said receiver whereby said synchronization of said communications terminal is achieved; detecting a first component waveform of said two or more component waveforms, and detecting a second component waveform of said two or more waveforms, wherein said detecting said first component waveform comprises desweeping said first component waveform into a first deswept component waveform, wherein said first deswept component waveform is a narrow band waveform; transforming said first deswept component waveform into a first frequency domain representation; estimating a signal-to-noise ratio of said first frequency domain representation; comparing said signal-to-noise ratio of said first frequency domain representation to a threshold; estimating, in the event said threshold is exceeded, a first peak frequency of said first frequency domain representation; desweeping said second component waveform of said two or more component waveforms into a second deswept component waveform; transforming said second deswept component waveform into a second frequency domain representation; and estimating a second peak frequency from said second frequency domain representation; and wherein said estimating comprises estimating, using said first peak frequency and said second peak frequency and said known frequency variation of each of said first component waveform and said second component waveform; and wherein said frequency offset is defined by the formula: wherein f