Apparatus for searching multipath in spread spectrum communications system and method thereof
First Claim
1. A multipath searching apparatus comprising:
- a radio front-end for converting a received radio signal into a baseband signal and outputting the baseband signal;
a receiving unit for despreading the baseband signal, and combining despread signals;
a profile calculating unit for calculating and outputting a multipath profile of the baseband signal;
a first detector for determining whether or not the radio signal traveling along a multipath is having a short-delay path by comparing a peak value of the multipath profile with a profile value of a predetermined position time interval before and after the peak of the multipath profile, when the comparison result is greater than a predetermined threshold the signal is determined to have a short-delay path; and
a path selector for receiving the multipath profile and the detection result of the first detector, separating the multipath profile into two profiles and two signals when the radio signal is determined to have a short-delay path, generating time delay information for each path, where the radio signal having a short-delay is sent to fingers of the receiving unit with the time delay information, wherein the receiving unit receives time delay information of the paths.
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Abstract
A multipath searching device includes a radio front-end for converting a received radio signal into a baseband signal and for outputting the baseband signal. A profile calculating unit is included for calculating and outputting the multipath profile of the baseband signal. A first detector determines whether or not the radio signal traveled along a multipath is having a short-delay path by comparing the peak value of the multipath profile with a profile value of a predetermined position time interval before or after the peak of the multipath profile. A path selector receives the multipath profile and the detection result of the first detector, generates time delay information for each path, and separates many paths along which the radio signal traveled. A receiving unit receives the time delay information of the paths, despreads the baseband signal, and combines despread signals.
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Citations
14 Claims
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1. A multipath searching apparatus comprising:
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a radio front-end for converting a received radio signal into a baseband signal and outputting the baseband signal; a receiving unit for despreading the baseband signal, and combining despread signals; a profile calculating unit for calculating and outputting a multipath profile of the baseband signal; a first detector for determining whether or not the radio signal traveling along a multipath is having a short-delay path by comparing a peak value of the multipath profile with a profile value of a predetermined position time interval before and after the peak of the multipath profile, when the comparison result is greater than a predetermined threshold the signal is determined to have a short-delay path; and a path selector for receiving the multipath profile and the detection result of the first detector, separating the multipath profile into two profiles and two signals when the radio signal is determined to have a short-delay path, generating time delay information for each path, where the radio signal having a short-delay is sent to fingers of the receiving unit with the time delay information, wherein the receiving unit receives time delay information of the paths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A multipath searching method comprising the steps of:
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(a) converting a received signal into a baseband signal and outputting the baseband signal; (b) obtaining a multipath profile based on power of the baseband signal; (c) determining whether or not the received signal traveling along a multipath is having a short-delay path by comparing a peak value of the multipath profile with a profile value of a predetermined position time interval before and after the peak of the multipath profile, when the comparison result is greater than a predetermined threshold the signal is determined to have a short-delay path, separating a multipath profile into two profiles and two signals when the signal is determined to have a short-delay path, sending the two separated signals to fingers of the receiving unit, and generating time delay information for each path; and (d) receiving the time delay information of the paths, despreading the baseband signal, combining the signals and outputting the combined result, wherein it is unnecessary to separate multipath signals not having the short-delay path. - View Dependent Claims (11, 12, 13, 14)
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Specification