Phase tracking in frequency domain in a wireless communication system

An apparatus, comprising:

• means for collecting a plurality of modulated weighted pilot tones associated with one or more first symbols;
• means for demodulating the plurality of modulated weighted pilot tones;
• and
• means for generating an error signal by summing the plurality of demodulated weighted pilot tones and then calculating the arctangent of the summed demodulated weighted pilot tones;
• means for generating an estimated phase rotation due to a residual CFO and based on the error signal;
• means for generating a correction phase for the plurality of tones, based on the estimated phase rotation;
• and
• means for applying the correction phase to one or more symbols subsequent to the one or more first symbols.

A method for correcting a sampling frequency offset (SFO) and a carrier frequency offset (CFO) in a wireless communication system, comprising:

• collecting a plurality of modulated weighted pilot tones associated with one or more first symbols;
• demodulating the plurality of modulated weighted pilot tones;
• generating an error signal by summing and then calculating the arctangent of the plurality of demodulated weighted pilot tones;
• passing the error signal through a loop filter to generate an estimated phase rotation due to a residual CFO;
• generating a correction phase based on the estimated phase rotation;
• and
• applying the correction phase to one or more symbols subsequent to the one or more first symbols.

A computer-readable medium embodying a set of instructions executable by one or more processors, comprising:

• code for collecting a plurality of modulated weighted pilot tones associated with one or more first symbols;
• code for demodulating the plurality of modulated weighted pilot tones;
• code for generating an error signal by summing and then calculating the arctangent of the plurality of demodulated weighted pilot tones;
• code for passing the error signal through a loop filter to generate an estimated phase rotation due to a residual CFO;
• code for generating a correction phase based on the estimated phase rotation;
• and
• code for applying the correction phase to one or more symbols subsequent to the one or more first symbols.