Fixed time acquiring method under continuous system multipath channel

Abstract

The invention provides a fixed time acquiring method under a continuous system multipath channel. The method comprises steps of acquiring a main peak through maximum likelihood searching; and acquiring a first arrival diameter through generalized likelihood ratio and peak detection. According to the fixed time acquiring method under the continuous system multipath channel, the maximum likelihood searching and the generalized likelihood ratio and peak detection are adopted at the same time to avoid using an absolute threshold, so that the robustness of a search algorithm is obviously improved, and the system can work in occasions with larger signal to noise ratio dynamic range.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and in particular relates to a timing acquisition method under a continuous system multipath channel. Background technique [0002] Timing acquisition is one of the most critical technologies in communication systems, also known as coarse synchronization. The purpose of timing acquisition is to roughly estimate the phase of the received data block, and obtain basic timing information, such as the starting moment of the data block, to realize subsequent estimation of related parameters and demodulation and decoding. Therefore, timing capture is the basis for the normal operation of the entire communication system. [0003] The entire uncertain phase region of timing capture is composed of several in-phase phases (H 1 ) and out-of-phase phase (H 0 )composition. h 1 The phase indicates the phase of the local sequence within 1 chip of the phase difference from the receiving timing a...

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Problems solved by technology

[0006] The traditional timing acquisition method works better when the auxiliary sequence is long, the channel is a single-path channel or a multi-path channel with obvious LOS paths, but this method has defects: firstly, when the LOS path is not obvious, that is, the multipath component When the diameter energy is comparable, there will be multiple H 1 phase, each H 1 The phases will all correspond to a path with higher energy

Secondly, in the search mode and verification mode, threshold 1 and threshold 2 are both fixed thresholds. For a system environment with a large dynamic range, the capture performance will be unstable.

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