Method for detecting random access signal
Provided is a method for detecting random access signal, and the method includes detecting a peak position of a random access signal in a first preamble section and ignoring the random access signal apart from the peak position for less than a certain distance in a second preamble section adjacent to the first preamble section.
1. A method for detecting a random access signal in a mobile communication system, the method comprising:
detecting a peak position of a random access signal in a first preamble section;
identifying a region in a second preamble section adjacent to the first preamble section, the region within a specified distance of the detected peak position; and
ignoring the random access signal apart from the peak position within the region in the second preamble section adjacent to the first preamble section.
2. The method of claim 1 , wherein the detecting of the peak position comprises:
determining whether an amplitude of the random access signal is larger than a predetermined threshold value for each detection position; and
comparing the amplitude of the random access signal, which is larger than the threshold value, of each detection position to each other.
3. The method of claim 1 , further comprising:
calculating a preamble index value dividing the first and second preamble sections; and
determining where the random access signal is disposed in either the first or the second preamble section, using the calculated preamble index value in each detection position.
4. The method of claim 1 , further comprising determining the random access signal as a random access signal of the first preamble section.
5. The method of claim 4 , further comprising determining, if a random access signal exists farther away from the peak position for more than the certain distance, the random access signal existing farther away from the peak position for more than the certain distance as a random access signal of the second preamble section.
6. A method for detecting a received random access signal in a mobile communication system, the method comprising:
sequentially indexing a plurality of detection positions of a random access signal;
calculating an amplitude of the random access signal for each current index value;
determining which of first and second preamble sections each of the current index value is in;
determining the current index value of the random access signal having the largest amplitude among the current index values belonging to the first preamble section as a peak index value;
identifying a region in a second preamble section adjacent to the first preamble section, the region within a specified distance of the detected peak position; and
ignoring a random access signal of a current index value, within the region, among the current index values belonging to the second preamble section.
7. The method of claim 6 , wherein the determining of a position of the index value comprises:
calculating a preamble index value dividing the first and second preamble sections for each current index value; and
comparing the preamble index value of the current index value to each other.
8. The method of claim 6 , wherein the determining of the peak index value comprises:
determining whether an amplitude of the random access signal of each current index value is larger than a predetermined threshold value; and
comparing the amplitude of the random access signal of each current index value larger than the threshold value to each other.
9. The method of claim 6 , wherein the ignoring of the random access signal comprises:
determining whether an amplitude of a random access signal of a current index value belonging to the second preamble section is larger than the predetermined threshold value; and
ignoring the current index value belonging to the second preamble section larger than the threshold value and the random access signal where a difference from the peak index value is less than the predetermined peak ignorance region value.
10. The method of claim 6 , further comprising determining the random access signal as a random access signal of the first preamble section.
11. The method of claim 10 , further comprising determining a random access signal of a current index value, in which a difference from the peak index value is larger than the predetermined peak ignorance region value, among each current index value belonging to the second preamble section as the random access signal of the second preamble section.