Methods of suppressing reference oscillator harmonic interference and related receivers

A method for receiving signals over one of a plurality of frequency channels, said method comprising the steps of:

• generating a reference frequency signal;
• downconverting received signals to provide intermediate frequency signals wherein said downconvertering step is synchronized to said reference frequency signal;
• generating a plurality of complex numbers representative of said received signals including interference components responsive to said intermediate frequency signals wherein said generation of said complex numbers is synchronized to said reference frequency signal;
• estimating an origin point for said plurality of complex numbers;
• subtracting said origin point from each of said complex numbers thereby producing interference-compensated complex numbers representative of said received signals with reduced internally generated interference;
• and
• processing said interference-compensated complex numbers to obtain desired signaling information.

A receiver tunable to a plurality of frequency channels, said receiver comprising:

• a reference frequency generator which generates a reference frequency signal;
• a downconverter which downconverts received signals to provide intermediate frequency signals wherein said down converter is synchronized to said reference frequency signal;
• an analog-to-digital converter which generates a plurality of complex numbers representative of said received signals including interference components related to said reference frequency signal wherein said analog-to-digital converter is synchronized to said reference frequency signal and wherein said plurality of complex numbers are generated responsive to said intermediate frequency signals;
• and
• a processor which processes said complex numbers to compensate for said interference components and to obtain desired signaling information wherein said processor estimates an origin point for said plurality of complex numbers and subtracts said origin point from each of said complex numbers and wherein said estimated origin point is estimated by estimating a center of one of a circle and an arc on which said plurality of complex numbers are expected to lie.

A method for receiving signals over one of a plurality of frequency channels, said method comprising the steps of:

• generating a reference frequency signal;
• downconverting received signals to provide intermediate frequency signals wherein said downconvertering step is synchronized to said reference frequency signal;
• generating a plurality of complex numbers representative of said received signals including interference components related to said reference frequency signal wherein said generation of said complex numbers is synchronized to said reference frequency signal and wherein said plurality of complex signals are generated responsive to said intermediate frequency signals;
• and
• processing said complex numbers to compensate for said interference components and to obtain desired signaling information wherein processing said complex numbers comprises estimating an origin point for said plurality of complex numbers and subtracting said origin point from each of said complex numbers and wherein said estimated origin point is estimated by estimating a center of one of a circle and an arc on which said plurality of complex numbers are expected to lie.

A receiver tunable to a plurality of frequency channels, said receiver comprising:

• a reference frequency generator which generates a reference frequency signal;
• a downconverter which downconverts received signals to provide intermediate frequency signals wherein said down converter is synchronized to said reference frequency signal;
• an analog-to-digital converter which generates a plurality of complex numbers representative of said received signals including interference components related to said reference frequency signal wherein said analog-to-digital converter is synchronized to said reference frequency signal and wherein said plurality of complex numbers are generated responsive to said intermediate frequency signals;
• and
• a processor which digitally high-pass filters said complex numbers to compensate for said reference frequency related interference and to obtain desired signaling information wherein said processor estimates an origin point for said plurality of complex numbers and subtracts said origin point from each of said complex numbers and wherein said estimated origin point is estimated by estimating a center of one of a circle and an arc on which said plurality of complex numbers are expected to lie.

A method for receiving signals over one of a plurality of frequency channels, said method comprising the steps of:

• generating a reference frequency signal;
• downconverting received signals to provide intermediate frequency signals wherein said downconvertering step is synchronized to said reference frequency signal;
• generating a plurality of complex numbers representative of said received signals including interference components related to said reference frequency signal wherein said generating of said complex numbers is synchronized to said reference frequency signal and wherein plurality of complex numbers are generated responsive to said intermediate frequency signals;
• digitally high-pass filtering said complex numbers to compensate for said reference frequency related interference and to obtain desired signaling information;
• estimating an origin point for said plurality of complex numbers wherein said estimated origin point is estimated by estimating a center of one of a circle and an arc on which said plurality of complex numbers are expected to lie;
• and
• subtracting said origin point from each of said complex numbers.