Apparatus and method for estimating delay spread of multi-path fading channel in wireless communication system

An apparatus for estimating delay spread of a multi-path fading channel in a wireless communication system, comprising:

• a standard deviation calculator for producing a standard deviation value of a noise component from time-domain signal values obtained from a received signal;
• a comparator for comparing a time-domain signal value in each time index with a threshold value designated by the standard deviation value while decrementing a time index value from a preset time index of time indexes respectively corresponding to sampling points;
• and
• a maximum delay spread detector for detecting, as a maximum delay spread value, a delay time corresponding to one of the time indexes in which a time-domain signal value equal to or greater than the threshold value appears first.

A method for estimating delay spread of a multi-path fading channel in a wireless communication system, comprising:

• producing a standard deviation value of a noise component from time-domain signal values obtained from a received signal;
• comparing the time-domain signal values corresponding to preset sampling points with a threshold value designated by the standard deviation value;
• and
• detecting, as a maximum delay spread value, a delay time of a time index that corresponds to a time-domain signal value equal to or greater than the threshold value and which simultaneously is a maximum time index among time indexes respectively corresponding to the sampling points.

A method for estimating delay spread of a multi-path fading channel in a wireless communication system, comprising:

• producing a standard deviation value of a noise component from time-domain signal values obtained from a received signal;
• comparing a time-domain signal value in each time index with a threshold value designated by the standard deviation value while decrementing a time index value from a preset time index of time indexes respectively corresponding to sampling points;
• and
• detecting, as a maximum delay spread value, a delay time corresponding to one of the time indexes in which a time-domain signal value equal to or greater than the threshold value appears first.