Receiver local oscillator leakage compensation in the presence of an interferer

A direct current offset compensation method for a zero intermediate frequency radio, comprising:

• calculating a first compensation value to cancel out an unwanted direct current offset for a predetermined attenuation of the zero intermediate frequency radio, wherein the radio is isolated enough to reliably calculate the first compensation value;
• calculating additional compensation values for other attenuations of the zero intermediate frequency radio using a known function, wherein the known function is derived from a known relationship between the attenuations of the radio;
• and
• entering a communications network by a receiver with the zero intermediate frequency radio using the calculated compensation values.

A receiver comprising:

• a modem to connect the receiver to a communications network;
• and
• a zero intermediate frequency radio, comprising:
• an antenna to receive a wireless signal;
• a local oscillator to generate a second signal, wherein the second signal is mixed with the wireless signal, resulting in a mixed signal;
• and
• a circuit to cancel an unwanted direct current component from the mixed signal by calculating different compensation values at each gain setting of the radio, the circuit to:
• calculate an initial compensation value during a predetermined gain setting of the radio;
• use a known function of the calculated compensation value to obtain other gain settings of the zero intermediate frequency radio during entry of the receiver into a network;
• and
• calculate additional compensation values for the other gain settings while the receiver is in a known period of non-interference following network entry.