Random bandwidth ratio carrier superposition cancellation method, digital demodulation method and device

A carrier superposition and cancellation device technology, applied in the field of satellite communication, can solve the problems of high hardware requirements, inapplicable transmission delay satellite communication scenarios, etc.

Active Publication Date: 2020-01-10
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 tr

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  • Random bandwidth ratio carrier superposition cancellation method, digital demodulation method and device
  • Random bandwidth ratio carrier superposition cancellation method, digital demodulation method and device
  • Random bandwidth ratio carrier superposition cancellation method, digital demodulation method and device

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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 random bandwidth ratio carrier superposition cancellation method, a digital demodulation method and a digital demodulation device. The method comprises the following steps: dividing a digital baseband signal into two paths for processing, wherein one path is mainly used for carrying out processing, frame entering positioning, channel parameter extraction and transformation and self-interference signal reconstruction on the self-interference signals, and the other path is mainly used for carrying out frame synchronization according to a frame positioning result, so that frame headers of the self-interference signals in the two processing channels are aligned, and meanwhile, cancellation is carried out according to the reconstructed self-interference signals to obtain opposite-end signals. The device comprises: a self-interference signal processing channel which is used for processing one path of digital baseband signal and comprises a filtering module, a firstframe synchronization module, a channel parameter extraction module and a self-interference signal reconstruction module; a mixed signal processing channel that is used for processing the other path digital baseband signal and comprises a second frame synchronization module and a self-interference signal cancellation module. By adopting full-digital processing, the purposes of canceling self-interference signals in two carrier signals with a random bandwidth ratio and demodulating opposite-end signals are achieved.

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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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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