Cancellation method, digital demodulation method and device for arbitrary bandwidth ratio carrier superposition

A carrier superposition and bandwidth ratio technology, applied in the field of satellite communication, can solve the problems of high hardware requirements and inappropriate transmission delay satellite communication scenarios, and achieve the effect of improving signal-to-noise ratio and flexibility

Active Publication Date: 2022-01-04
四川安迪科技实业有限公司
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Problems solved by technology

However, this method is not suitable for satellite communication scenarios with large transmission delay and complex channel characteristics, and has high hardware requirements

Method used

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  • Cancellation method, digital demodulation method and device for arbitrary bandwidth ratio carrier superposition
  • Cancellation method, digital demodulation method and device for arbitrary bandwidth ratio carrier superposition
  • Cancellation method, digital demodulation method and device for arbitrary bandwidth ratio carrier superposition

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Embodiment Construction

[0065] The method and device provided by the present application will be described in detail below with reference to the accompanying drawings.

[0066] The superimposed satellite downlink signal is amplified, filtered, frequency-converted, and analog-to-digital converted by analog devices to obtain a digital baseband signal. The present application is used to process the digital baseband signal to achieve the purpose of filtering / cancelling the self-interference signal in the superimposed carrier signal and demodulating the signal at the opposite end.

[0067] Such as figure 1 An example of a cancellation method supporting arbitrary bandwidth ratio carrier superposition is shown.

[0068] First, the digital baseband signal is divided into two channels for simultaneous processing, one is a self-interference signal processing channel, and the other is a mixed signal processing channel. In the self-interference signal processing channel, the self-interference signal is mainly...

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Abstract

The invention discloses a cancellation method, a digital demodulation method and a device for arbitrary bandwidth ratio carrier superimposition. The method includes dividing the digital baseband signal into two paths, one path is mainly for self-interference signal processing, frame positioning, channel parameter extraction and transformation, and self-interference signal reconstruction; the other path is mainly for frame synchronization based on frame positioning results, so that the two The frame header of the self-interference signal in the processing channel is aligned, and at the same time, cancellation is performed according to the reconstructed self-interference signal to obtain the opposite end signal. The device includes a self-interference signal processing channel for processing one of the digital baseband signals, including a filtering module, a first frame synchronization module, a channel parameter extraction module, and a self-interference signal reconstruction module; a mixed signal processing channel for processing the other One digital baseband signal, including a second frame synchronization module and a self-interference signal cancellation module. Through the use of full digital processing, the purpose of canceling the self-interference signal in the superimposed carrier signal of two arbitrary bandwidth ratios and demodulating the opposite end signal is realized.

Description

technical field [0001] The invention relates to the field of satellite communication, and in particular relates to a cancellation method, a digital demodulation method and a device for arbitrary bandwidth ratio carrier superposition. Background technique [0002] Satellite communication carrier superposition technology is a satellite modulation and demodulation technology that realizes frequency multiplexing. Since the synchronous satellite channel adopts a transparent forwarding method, the satellite communication terminal can send and receive spontaneously. Carrier superposition technology uses this feature to cancel the self-transmission signal (ie self-interference signal) in the superimposed carrier (mixed signal) of the downlink through digital signal processing, and then demodulates the transmission signal of the communication peer. [0003] For the carrier superposition communication technology, related interference elimination methods have appeared in the existing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H04L27/26H04L27/38
CPCH04L27/0014H04L27/2656H04L27/2691H04L27/3854H04L2027/0032
Inventor 赵深林
Owner 四川安迪科技实业有限公司
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