Patent ID: 8611472

Claim:
A receiver for reducing acquisition time of a Carrier Frequency Offset (CFO) of an input intermediate frequency (IF) signal with M-ary Phase Shift Keying (M-PSK) modulated preamble, said receiver comprising: an analog to digital converter (ADC) that converts said input IF signal into a digital signal; a down conversion unit that down converts said digital signal to a baseband complex signal; and a CFO estimation block that estimates said CFO using spectral based analysis, wherein said CFO estimation block comprises: a carrier harmonic generation unit that generates an output of a carrier Mth harmonic without modulation from said baseband complex signal; a spectral mapping unit that spectrally maps said carrier Mth harmonic using a complex Fast Fourier Transform (FFT) and generates a spectrally mapped carrier Mth harmonic signal; a spectral analysis unit that performs a peak search on said spectrally mapped carrier Mth harmonic signal to obtain a peak position (PPOS); and a Carrier Frequency Offset (CFO) estimation unit that estimates the CFO based on said peak position (PPOS); wherein said receiver is capable of supporting wire-line as well as wireless standards, and wherein an estimation of said CFO is carried out at said symbol rate to reduce implementation complexity.