Base band digital signal encoding modulation integrated system

A baseband digital signal, coding and modulation technology, applied in the field of space communication, can solve the problems of modulated signal spectrum expansion, sideband uplift, etc., achieve high integration and flexibility, overcome single function, and meet the effect of functional application requirements

Inactive Publication Date: 2013-06-19
NAT SPACE SCI CENT CAS
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Problems solved by technology

[0006] However, based on the technical solution disclosed in this article, when the non-constant envelope SRRC-QPSK modulation method with envelope zero crossing is used and the power amplifier works in a saturated state, it will cause spectrum expansion and sideband lift of the modulated signal

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  • Base band digital signal encoding modulation integrated system
  • Base band digital signal encoding modulation integrated system
  • Base band digital signal encoding modulation integrated system

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Embodiment Construction

[0041] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0042] The invention provides an adaptive control technology that realizes the integration of baseband digital signal encoding and modulation, including modules such as interface, control logic, MUX (multiplexer) and DEMUX (data distributor).

[0043] The interface module includes two parts: the data interface FIFO (First In First Out) and the internal data unit. The data FIFO interface receives the baseband digital serial data and clock from the outside, and converts it into the frame format required by RS (255, 223) encoding. The internal data unit provides fixed reference data for circuit debugging. This data already has the frame format required for RS (255, 223) encoding, which can be conveniently used for engineering debugging and verification.

[0044] Under the action of external instructions, the control logic module controls the w...

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Abstract

The invention provides a base band digital signal encoding modulation integrated system comprising a cascade encoding module, a PCM/PSK/PM modulation module and a BPSK/NRZ modulation module. The system is characterized by further comprising a control subsystem used for controlling encoding modulation modes of the cascade encoding module, the PCM/PSK/PM modulation module and the BPSK/NRZ modulation module, wherein the subsystem further comprises an interface module, a first multiplexer, an SRRC-OQPSK modulation module, a data distributor, a multiplexer and a control logic module. The first multiplexer is used for selecting data in one path from two path data output from the interface module and outputting the data to a post-stage circuit which is the cascade coding module. The system is used for completing reed-solomon (RS) coding interface data selection of base band data and coding framing, and can correspondingly select different modulation mode functions according to different transmission code rates including a low transmission code rate, a medium transmission code rate and a high transmission code rate. The system correspondingly selects PCM/PSK/PM.BPSK/NRZ and RC-OQPSK modulation modes according to a downlink low data code rate, a downlink medium data code rate and a downlink high data code rate after achieving base band signal encoding.

Description

technical field [0001] The invention belongs to the field of space communication, and relates to a multifunctional integrated control technology for baseband signal encoding and modulation in a satellite-borne digital transmission transmitter, that is, the invention relates to an integrated baseband digital signal encoding and modulation system. Background technique [0002] The main task of the spaceborne digital transmission transmitter is to encode, modulate and amplify the scientific data and engineering telemetry parameters of payload detection, and then transmit them to the ground receiving station through the antenna. At present, the uplink and downlink data transmission transmitters of some deep space probes mainly use analog low-IF modulation schemes. After the baseband data or telemetry data from the payload is channel coded, it is first modulated on the analog intermediate frequency; after intermediate frequency processing such as intermediate frequency filtering ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L27/20
Inventor 梁显锋张津舟熊蔚明安军社
Owner NAT SPACE SCI CENT CAS
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