Path detection device and path detection method

Abstract

An adjacent sample comparison processor (201) compares power values of adjacent samples of a delay profile created according to a reception signal over-sampled and detects whether the power value is increasing or decreasing. If the comparison result is identical to the increase / decrease information on the power values between adjacent samples at the previous time, a comparison result storage processor (204) adds 1. If the comparison result is different, the comparison result storage processor (204) performs a reset and newly sets 1. When the count of the comparison result storage processor (204) has become identical to the over-sampling number, a slope judgment processor (205) controls a path selection section (207) so as to select a corresponding sample as a path. The path selection section (207) selects a relative maximum sample as a path candidate and also selects the sample instructed by the slope judgment processor (205) as a path. Thus, it is possible to reduce the calculation amount when selecting a path, assure a path selection, and reduce the reception data error ratio.

Description

technical field [0001] The present invention relates to a path detection device and a path detection method, in particular to a path detection device and a path detection method which use delay distribution to detect a fundamental wave and a delayed wave. Background technique [0002] Conventionally, path detection methods using delay profiles include a maximum value detection method and a maximum value detection method. [0003] The maximum value detection method is a method of selecting, as a path, a sample whose power value is the largest in each element (sample) of the delay profile. That is to say, use the maximum value detection of the delay distribution, extract the detected samples and process them, so that the 1 chip interval before and after the detection sample is included (when K samples are oversampled, K-1 before and after the detection sample The power of the interval) is 0, and the detection of the candidate path is performed by repeating the detection of th...

AI Technical Summary

Problems solved by technology

[0006] However, in the conventional path detection device and path detection method, when the maximum value detection method is used in the path detection method, since the maximum value and the maximum value of the number of high-ranked pointers can be reliably detected, the path detection accuracy is high, but There is a problem that the delay profile must be scanned the same number of times as the number of pointers, resulting in an increase in the amount of computation

[0007] On the other hand, when the maximum value detection method is used in the path detection method, although the amount of calculation is reduced, such as figure 1 As shown in , when there are paths at 1-chip intervals, sample S2 is originally a path that should be selected as a delayed wave, but since sample S2 is not a maximum value, it is not selected as a path, so the received signal cannot be detected sufficiently while receiving an error in the data

Especially when communicating in an environment where multipath is likely to occur due to many obstacles, such as indoors, sometimes a delayed wave that is only slightly slower than the fundamental wave may be measured, and errors may occur in received data in an environment where multipath occurs. more probable problem

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