Patent ID: 8144811
Filing Date: 2012-03-27
Classification: H04B

Abstract:
1. A method for processing a Bluetooth signal, the method comprising: receiving an RF signal; mixing the RF signal with a first frequency to produce a first signal; low-pass filtering the first signal to produce an intermediate frequency (IF) signal; and processing the IF signal to recover transmitted symbols, wherein the processing includes: digitizing the IF signal to produce a digital IF signal; filtering the digital IF signal with a low-pass filter; decimating the low-pass filtered digital IF signal to produce a decimated IF signal; subtracting an estimated DC offset from the decimated IF signal to produce a corrected IF signal; mixing the corrected IF signal with a second frequency to produce a baseband signal; transforming the baseband signal to polar coordinates including amplitude and phase to produce a transformed baseband signal; using differences of the amplitude of currently selected and adjacent sub-samples to change a timing of the baseband signal and modify the phase of the transformed baseband signal; and recovering the transmitted symbols from the modified transformed baseband signal.