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Method for achieving wireless communication timing coarse synchronization by using 1bit quantification and hard decision

A wireless communication and wireless communication system technology, which is applied in the field of timing coarse synchronization, can solve problems such as large dynamic range of filtering result amplitude, multi-bit quantization false alarm, complex adaptive process of rough synchronization threshold, etc., to reduce the amount of calculation and complexity degree of effect

Inactive Publication Date: 2012-09-05
TSINGHUA UNIV
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Problems solved by technology

Due to the large dynamic range of the filtering result after multi-bit quantization, the coarse synchronization threshold requires a relatively complex adaptive process; at the same time, for a communication system that uses data frames to achieve multi-user and multi-point access, due to the burstiness of data services and The interference of other users in the same frame makes multi-bit quantization often have false alarms

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  • Method for achieving wireless communication timing coarse synchronization by using 1bit quantification and hard decision
  • Method for achieving wireless communication timing coarse synchronization by using 1bit quantification and hard decision
  • Method for achieving wireless communication timing coarse synchronization by using 1bit quantification and hard decision

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Embodiment Construction

[0017] Assuming that the data frame header is a 1024-point PSC code synchronization head, the concrete implementation steps of the present invention (attached figure 1 )for:

[0018] 1) 1-bit quantization: the receiving end uses 1-bit quantization for both the demodulated signal I and Q, that is, if the amplitude is greater than 0, it will be quantized as 1, otherwise, it will be quantized as -1, and the unit is based on the actual output amplitude of the 1-bit quantizer;

[0019] 2) Matched filtering: the quantized bit stream is matched with a 1024 point long PSC code matched filter;

[0020] 3) Hard decision: The hard decision threshold is fixed at 220 (the unit is based on the actual output amplitude of the 1bit quantizer). A comparator is used to compare the matched filtered signal amplitude with a hard decision threshold, and when a peak exceeding the threshold is encountered, it is considered that the synchronization head has been captured, and the rough synchronization...

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Abstract

The invention relates to a method for achieving wireless communication timing coarse synchronization by using 1bit quantification and hard decision and belongs to the technical field of wireless mobile communication synchronization. The method is characterized by comprising the following steps that: a receiving end firstly carries out 1bit quantification on a demodulated signal; after being quantified, the signal is subjected to matched filtering by a matched filter; and a filtering result is directly compared with a fixed threshold value to search for a synchronous head so as to realize timing coarse synchronization. The scheme can effectively solve the false-alarm problem caused by the frequently and greatly faded signal under the multi-user and multipoint access condition by using a data frame. Meanwhile, the amplitude dynamic range of the filtering result is narrower, and the decision threshold value can be constant without self-adaptation. Moreover, after quantification, only 1bit information exists so as to effectively reduce calculated quantity and reduce the complexity of a synchronization module.

Description

technical field [0001] The invention belongs to the technical field of wireless mobile communication synchronization, and relates to a timing coarse synchronization method suitable for a wireless communication system. Background technique [0002] In wireless communication systems, the acquisition of timing synchronization is very important. The receiving end needs to overcome factors such as channel time selectivity, frequency selectivity, and other user interference to complete synchronization accurately, and then complete a series of follow-up operations such as FFT and channel estimation. Therefore, accurate synchronization is a prerequisite for completing follow-up work. Timing synchronization is usually completed by timing coarse synchronization and timing fine synchronization. The timing coarse synchronization is mainly used to detect the arrival of data frames, and the timing fine synchronization is mainly to detect the precise position of the frame header to determi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W56/00H04L1/00
Inventor 周世东陈翔肖立民张秀军朱晋王京
Owner TSINGHUA UNIV
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