Decoding auxiliary demodulation method of variable-length burst-mode signals
A technology of burst signal and demodulation method, which is applied in the field of decoding auxiliary demodulation of variable-length burst signal, and can solve the problem that the demodulation of variable-length burst signal cannot be satisfied, and the symbol length of burst signal varies greatly. problem, to achieve the effect of high reliability, mature algorithm and simple implementation
Active Publication Date: 2017-12-15
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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[0002] MPSK modulation has been widely used in various digital communication fields. The physical layer of the satellite mobile communication system transmits burst signals, that is, MPSK modulation is used. Since the service rate carried by the physical layer of the satellite mobile communication system ranges from several Kbps to hundreds of Kbps, The symbol length of the burst signal transmitted in the channel is quite different. There are short burst signals with a length of dozens of symbols and long burst signals with a length of 2000 symbols. The unique codes of short burst signals are only a few symbols, and the unique code of a long burst signal can reach as many as hundreds of symbols. The conventional demodulation algorithm cannot satisfy the demodulation of variable length burst signals.
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[0051] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0052] A decoding-assisted demodulation method for a variable-length burst signal, suitable for a satellite mobile communication system, comprising the following steps:
[0053] (101) Perform data down-conversion to the received digital baseband signal to remove the fixed frequency difference of the baseband signal, and perform matched filter processing;
[0054] (102) Timing estimation is performed on the sample point data after the matched filtering to obtain timing deviation information, and interpolation according to the timing deviation information obtains symbol data;
[0055] (103) Accordin...
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The present invention discloses a decoding auxiliary demodulation method of variable-length burst-mode signals, and relates to the satellite mobile communication system gateway station design and terminal design technology. Aiming at the features that a down link has burst-mode signals with various symbol lengths in a satellite mobile communication system satellite, the burst-mode signals are divided into short burst-mode signals and long burst-mode signals according to the symbol lengths of the burst-mode signals, aiming at the long burst-mode signals and the short burst-mode signals, different demodulation processing modes are employed, and if a re-demodulation determination condition is satisfied after demodulation decoding, the auxiliary re-demodulation processing is performed so as to accurately complete the burst-mode signal data demodulation and decoding. The decoding auxiliary demodulation method of the variable-length burst-mode signals are accurate in estimation, is suitable for variable-length burst-mode signals and is suitable for demodulation of burst-mode signals of the satellite mobile communication system.
Description
technical field [0001] The invention belongs to the technical field of communication, in particular to a decoding-assisted demodulation method for a variable-length burst signal suitable for a satellite mobile communication system. Background technique [0002] MPSK modulation has been widely used in various digital communication fields. The physical layer of the satellite mobile communication system transmits burst signals, that is, MPSK modulation is used. Since the service rate carried by the physical layer of the satellite mobile communication system ranges from several Kbps to hundreds of Kbps, The symbol length of the burst signal transmitted in the channel is quite different. There are short burst signals with a length of dozens of symbols and long burst signals with a length of 2000 symbols. The unique codes of short burst signals are only a few symbols, and the unique code of a long burst signal can reach as many as hundreds of symbols, and the conventional demodula...
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Login to View More IPC IPC(8): H04L1/00H04L27/00H04L27/22H04B7/185
CPCH04B7/1853H04L1/0007H04L1/0061H04L1/0071H04L1/0079H04L27/0014H04L27/22H04L2027/0026
Inventor 张庆业王力男肖娜周微
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP