Noise variance estimation for frequency domain equalizer coefficient determination

A method for determining equalizer coefficients by a Radio Frequency (RF) receiver for a composite signal that includes a first information signal, a second information signal, and a pilot signal, the method comprising:

• equalizing the composite signal by a first equalizer to produce a first equalized information signal;
• equalizing the composite signal by a second equalizer to produce a second equalized information signal;
• determining a signal power of the composite signal;
• determining pilot signal interference power;
• determining pilot signal power;
• determining composite signal interference power based upon the composite signal power;
• determining a ratio of the composite signal interference power to the pilot signal interference power;
• determining a noise variance of the composite signal based upon the ratio of the composite signal interference power to the pilot signal interference power;
• and
• determining a plurality of equalizer coefficients based upon a first information signal channel estimate, a second information signal channel estimate, and the noise variance of the composite signal.

A Radio Frequency (RF) receiver operable to determine equalizer coefficients by a Radio Frequency (RF) receiver for a composite signal that includes a first information signal and a second information signal, the RF receiver comprising:

• a RF front end;
• and
• a baseband processing module coupled to the RF front end and operable to:
• determine a first information signal channel estimate based upon training symbols of the first information signal;
• determine a first information signal channel power based upon the first information signal channel estimate;
• determine a second information signal channel estimate based upon training symbols of the second information signal;
• determine a second information signal channel power based upon the second information signal channel estimate;
• determine a composite signal power of the composite signal;
• determine a noise variance of the composite signal based upon the first information signal channel power, the second information signal channel power, and the composite signal power;
• and
• determine a plurality of equalizer coefficients based upon the first information signal channel estimate, the second information signal channel estimate, and the noise variance of the composite signal.

A Radio Frequency (RF) receiver operable to determine equalizer coefficients by a Radio Frequency (RF) receiver for a composite signal that includes a first information signal and a second information signal, the RF receiver comprising:

• a RF front end;
• and
• a baseband processing module coupled to the RF front end and operable to:
• equalize the composite signal by a first equalizer to produce an first equalized information signal;
• equalize the composite signal by a second equalizer to produce an second equalized information signal;
• determine a signal power of the composite signal;
• determine pilot signal interference power;
• determine pilot signal power;
• determine composite signal interference power based upon the composite signal power;
• determine a ratio of the composite signal interference power to the pilot signal interference power;
• determine a noise variance of the composite signal based upon the ratio of the composite signal interference power to the pilot signal interference power;
• and
• determine a plurality of equalizer coefficients based upon a first information signal channel estimate, a second information signal channel estimate, and the noise variance of the composite signal.