Reception quality measuring apparatus and reception quality measuring method

A reception quality measuring method by a reception quality measuring apparatus which converts a pilot signal included in a single carrier signal from a signal in a time domain to a signal in a frequency domain, and measures a reception quality of the single carrier signal based on an equalized signal after equalization is performed, said method comprising the steps of:

• averaging a channel gain after equalization that is estimated on the basis of the pilot signal over a sub-carrier;
• calculating the power of a signal output from said first sub-carrier averaging unit to find signal power;
• generating a pilot signal replica with respect to a zero-timing signal component based on the zero-timing signal component when a signal x(n) in the time domain after equalization corresponding to the equalized signal is n=0, and also based on a previously set pilot code characteristic;
• subtracting the pilot signal replica from the equalized signal to generate an interference signal;
• calculating the power of the interference signal;
• averaging the power of the interference signal over the sub-carrier to find interference power;
• and
• dividing the signal power by the interference power to calculate a reception quality after equalization.

A reception quality measuring apparatus which converts a pilot signal included in a single carrier signal from a signal in a time domain to a signal in a frequency domain, and measures a reception quality of the single carrier signal based on an equalized signal after equalization is performed, said apparatus comprising:

• first sub-carrier averaging means for averaging and outputting a channel gain after equalization that is estimated on the basis of the pilot signal over a sub-carrier;
• first power calculating means for calculating the power of a signal output from said first sub-carrier averaging means and outputting the same as signal power;
• pilot replica generating means for generating and outputting a pilot signal replica with respect to a zero-timing signal component after equalization based on a signal output from said first sub-carrier averaging means, and also based on a pilot code characteristic;
• subtracting means for subtracting the pilot signal replica output from said pilot replica generating means from the equalized signal and outputting the result as an interference signal;
• second power calculating means for calculating and outputting the power of the interference signal output from said subtracting means;
• second sub-carrier averaging means for averaging the power output from said second power calculating means over the sub-carrier and outputting the result as interference power;
• and
• dividing means for dividing the signal power output from said first power calculating means by the interference power output from said second sub-carrier averaging means to calculate a reception quality after equalization.