Lock detection method suitable for various modulation modes
A lock detection and modulation mode technology, applied in the field of self-adaptive multi-modulation mode lock detection, can solve the problems of poor flexibility, inability to provide accurate and reliable lock detection, etc., to facilitate monitoring and operation, accurate and reliable carrier lock detection, simple and effective method Effect
Active Publication Date: 2012-05-09
10TH RES INST OF CETC
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Problems solved by technology
The threshold is a fixed constant, which needs to be obtained based on prior information and experimental information. It has poor flexibility and is easily affected by various factors such as noise, environment, and carried information.
Especially at low signal-to-noise ratios, such methods do not provide accurate and reliable lock detection
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[0031] refer to figure 1 . In a high-speed wireless data transmission system, the transmission sequence is modulated and transmitted at the data transmission sending end, and reaches the receiving end after channel transmission. At the receiving end, the data transmission demodulator performs carrier demodulation and clock recovery on the received sequence to obtain useful information. In order to monitor whether the demodulator is working normally, it is necessary to obtain the working status information of the demodulator, so it is necessary to add a lock detection module after the carrier demodulation module and the clock recovery module to detect whether the carrier demodulation loop is locked and the clock recovery loop Whether the road is locked. When the locking detection module detects that the working state of the demodulator is abnormal, it can reset the corresponding module to help the demodulator re-lock to the correct spectrum and enter the normal working state....
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The invention provides a lock detection method suitable for various modulation modes, wherein the method works in a digital demodulator and is used for detecting whether a carrier demodulation loop and a clock recovery loop are locked. The method is realized by the following technical scheme that: in the internal structure of the digital demodulator of a data transmission receiver, the lock detection suitable for various modulation modes is divided into a carrier demodulation loop lock detection part and a clock recovery loop lock detection part; a carrier demodulation loop lock detection module takes the intermediate-frequency signal energy as a lock detection threshold, at each time, compares the energy of a carrier demodulation output signal with the threshold, and executes carrier demodulation loop lock detection; and a lock recovery loop lock detection module takes the zero crossing point signal energy after clock recovery as the lock detection threshold, at each time, compares peak point signal energy after clock recovery with the threshold, and judges whether the loop is locked according to the comparison result.
Description
technical field [0001] The invention relates to an adaptive multi-modulation mode locking detection method for detecting whether a carrier demodulation loop and a clock recovery loop are locked, which works inside a digital demodulator in the field of wireless communication. More specifically, the present invention realizes adaptive multi-modulation mode locking detection through simple energy calculation and comparison. technical background [0002] With the advancement of aviation and aerospace technology, the process of human development and utilization of space is accelerating, and space activities are showing a trend of accelerated development. There are various types of aircraft distributed in the low and medium orbits of the earth, carrying more and more business types. The need to transmit data rates to and from ground stations is also increasing. [0003] Some countries have carried out the development of 100Mbps high-speed data transmission system as early as the ...
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IPC IPC(8): H04B17/00H03L7/08
Inventor 杜瑜唐婷
Owner 10TH RES INST OF CETC