Multi-path search method and device

Abstract

This invention provides a multi-pass searching method and a device used in the CDMA system, in which, the method includes: 1, carrying out slide correlation to received data so as to get time delay expansion, 2, interpolating the time delay expansion got from the slide correlation to mean the expansion and get a mean value, 3, searching the peak values of the expansion of each local area and sequencing them according to their sizes, 4, adjusting the time sequences of up-line physical channels and the down-line physical channels to guarantee that the largest peak value is at the center of the search window, 5, distributing peaks for local areas.

Description

technical field [0001] The invention relates to a multipath search method and device used in a CDMA (Code Division Multiple Access) system. Background technique [0002] In mobile communication, the signals sent from the base station propagate to users along different propagation paths. Since the lengths of these propagation paths are different, the time for these signals to reach users is also different, and there is a time delay between them. Generally speaking, the chip rate of the CDMA system is very high, and the scrambling code has good autocorrelation, so it has a strong multipath resolution, can make full use of the inherent frequency diversity of the multipath channel, and improve the bit error performance of the system . [0003] The multipath search function of the CDMA receiver is to form the time delay extension by despreading the received signal, and determine the air path according to the time delay extension, track the change of the air path, and assign the ...

AI Technical Summary

Problems solved by technology

[0011] However, there are defects in the existing technology such as inflexible implementation, low reliability, poor precision, and insufficient compact design.

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