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Bit synchronization and frame synchronization joint detection method of 4CPM signal

A technology of synchronous detection and joint detection, which is applied in the field of wireless data link, can solve problems such as large side lobe radiation, poor detection reliability, and wide modulation spectrum, and achieve strong anti-multipath fading ability, improved frame header SNR, and improved reliability effect

Active Publication Date: 2014-02-26
NO 8357 RES INST OF THE THIRD ACADEMY OF CHINA AEROSPACE SCI & IND
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Problems solved by technology

The defect that this method exists is: BPSK (Binary Phase Shift Keying) is wider than 4CPM modulation spectrum and sidelobe radiation is big, influences the sidelobe attenuation index of communication system; impact, poor detection reliability

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  • Bit synchronization and frame synchronization joint detection method of 4CPM signal
  • Bit synchronization and frame synchronization joint detection method of 4CPM signal
  • Bit synchronization and frame synchronization joint detection method of 4CPM signal

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Embodiment Construction

[0030] In order to make the purpose, content, and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0031] Such as figure 1 As shown, the embodiment of the present invention provides a kind of non-spread spectrum system 4CPM (quaternary continuous phase modulation) signal to carry out bit synchronization and frame synchronization joint detection, carry out bit synchronization and frame synchronization joint detection to 4CPM signal, divide as follows 5 steps to proceed:

[0032] 1) 4CPM modulation synchronous data design (corresponding to the following steps S1-S5);

[0033] 2) matching correlation and its preprocessing (corresponding to the following steps S6-S7);

[0034] 3) Compared with the adaptive threshold, detect the correlation peak (corresponding to the following step S8);

[0035] 4) Utilize the correla...

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Abstract

The invention relates to a bit synchronization and frame synchronization joint detection method of a 4CPM signal, and belongs to the technical field of wireless data chains. The bit synchronization and frame synchronization joint detection method of the 4CPM signal comprises the steps that 4CPM modulation synchronous data design is carried out; correlation matching and preprocessing of correlation matching are carried out; comparison is carried out between the result and a self-adaptation threshold, and a correlated peak is detected; bit synchronization is established by using the correlated peak and a bit synchronization detection method; frame synchronization is established by using a sign bit of the correlated peak, bit synchronization information and a frame synchronization extraction method. According to the bit synchronization and frame synchronization joint detection method of the 4CPM signal, due to the fact that the same 4CPM modulation is adopted for synchronous data and information data, the occupied frequency band is narrow, and a sidelobe attenuation index of a communication system is not influenced; due to the fact that continuous and repeated judgment is adopted in bit synchronization detection, reliability is improved; the signal to noise ratio of a frame header is effectively improved, reliability of frame synchronization detection is high, and the multipath fading resistance capacity is good.

Description

technical field [0001] The invention relates to the technical field of wireless data links, in particular to a joint detection method for bit synchronization and frame synchronization of 4CPM signals. Background technique [0002] The quaternary continuous phase modulation (4CPM) signal has the characteristics of continuous phase, constant envelope, small out-of-band radiation, and fast sidelobe attenuation, and has attracted extensive attention. The bit synchronization of 4CPM signal is the difficulty and the key point of system realization. Because 4CPM is a continuous phase modulation, there is no obvious amplitude change between symbols, the traditional bit synchronization method is difficult to use for 4CPM signals, in addition, in the wireless communication environment, the large-scale fading caused by the multipath effect of the channel will affect the communication system The bit synchronization and frame synchronization detection of the system cause serious interfe...

Claims

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Application Information

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IPC IPC(8): H04L7/00H04L27/22
Inventor 杜丹李永翔
Owner NO 8357 RES INST OF THE THIRD ACADEMY OF CHINA AEROSPACE SCI & IND
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