Multi-path fast frequency hopping signal processing method
A processing method and technology for frequency hopping signals, which are applied in radio transmission systems, electrical components, transmission systems, etc., can solve problems such as processing resources on large satellites, and achieve the effect of small calculation amount and hardware scale saving.
Active Publication Date: 2014-04-02
XIAN INSTITUE OF SPACE RADIO TECH
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In the FSK modulation method, one symbol is transmitted by one frequency conversion, and the FDMA channel interval is 4 times the symbol rate. The analog de-hopping is used on the star, and the fixed intermediate frequency multiplex signal after de-hopping is uniformly sampled by an AD, and then performed Digital processing requires digital branching, demodulation, synchronization error estimation, frequency offset estimation, channel power estimation and other processing, and completing these processing according to conventional methods requires very large on-board processing resources
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[0026] The present invention will be further introduced below in conjunction with the accompanying drawings.
[0027] A preliminary introduction is made to the technology related to the present invention.
[0028] digital shunt technology
[0029] The general digital branching algorithm adopts the FFT branching algorithm, and the FFT branching algorithm can be equivalent to figure 1 process. figure 1 The method shown is equivalent to using only one AD unified sampling for the input FDMA signal, and then using multiple different carriers for down-conversion to obtain a set of separated zero-IF baseband signals, and then the obtained zero-IF baseband signal After performing low-pass filtering, the branched output of the FDMA channel can be obtained.
[0030] demodulation technology
[0031] In the FM system, one symbol is transmitted per hop. Due to the influence of frequency hopping, a random phase will be generated at the moment of symbol conversion, so a non-coherent demo...
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The invention discloses a multi-path fast frequency hopping signal processing method which comprises the following steps: preprocessing sampling sequences obtained at a sampling rate of 4N / Tb so as to form two 4N point sequences and respectively carrying out FFT (fast fourier transform); and carrying out demodulation and parameter estimation on the preprocessed sequences. By utilizing the method provided by the invention, the algorithm accuracy is ensured, simultaneously, the operation scale can be greatly reduced, and the complexity of on-board processing (OBP) is reduced.
Description
technical field [0001] The invention discloses a multi-channel fast frequency hopping signal processing method. Background technique [0002] The new generation of communication satellites provides anti-interference mobile communication services by adopting frequency-hopping communication technology, which has the characteristics of strong anti-interference ability and supports many users. [0003] This system is a satellite frequency hopping communication system that supports multiple users. Due to the large number of ground users, in order to save resources on the star, multiple users share a frequency hopping local oscillator when de-hopping on the star, so the multi-user uplink of the satellite Adopt the system of frequency division multiplexing FDMA first and then frequency hopping. In the FSK modulation method, one symbol is transmitted by one frequency conversion, and the FDMA channel interval is 4 times the symbol rate. The analog de-hopping is used on the star, and...
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IPC IPC(8): H04B7/185H04B1/713
Inventor 李振华朱红李雄飞许宁江桂芳周国昌
Owner XIAN INSTITUE OF SPACE RADIO TECH