Full-digital intermediate-frequency despreading demodulation receiver

A receiver and all-digital technology, which is applied in the field of high-reliability all-digital IF despreading and demodulation receivers, can solve the problems of no description or report, no data collected, etc., to reduce the resources used by FPGA, reduce the capture time, good versatility

Inactive Publication Date: 2014-02-12
SHANGHAI SPACEFLIGHT INST OF TT&C & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no description or report of related technology similar to the present invention, and similar materials at home and abroad have not been collected yet.

Method used

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  • Full-digital intermediate-frequency despreading demodulation receiver
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  • Full-digital intermediate-frequency despreading demodulation receiver

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Embodiment Construction

[0025] The present invention will be further elaborated below in conjunction with the accompanying drawings.

[0026] as attached figure 1 As shown, the present invention is composed of transformer, AD, down-conversion and RS encoding and decoding FPGA, parallel related FPGA, despreading and demodulating DSP.

[0027] The transformer is composed of a 4:1 impedance converter and surrounding devices. Its function is to suppress common mode noise, isolate analog and digital grounds, and perform impedance matching.

[0028] AD digital / analog converter, its role is to sample the input intermediate frequency signal, select the appropriate sampling rate and number of bits, which can prevent spectrum aliasing, ensure sufficient calculation accuracy, and reduce the usage of FPGA resources , and guarantee a certain IF dynamic range.

[0029] The down-conversion and RS codec FPGA is a 300,000-gate FPGA (Field Programmable Gate Array). Its function is to eliminate the residual frequency...

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Abstract

The invention relates to a communication device of an electronic device, and discloses a full-digital intermediate-frequency despreading demodulation receiver. The full-digital intermediate-frequency despreading demodulation receiver comprises a transformer, an AD, a down-conversion and RS coding and encoding FPGA, a correlator FPGA and a DSP. The transformer is used for restraining common-mode noise, isolating analog digital ground and conducting impedance matching, the AD is used for conducting analogue-to-digital conversion on intermediate-frequency signals, the down-conversion and RS coding and encoding FPGA is used for conducting down-conversion on connected digital signals and conducting RS coding and decoding on baseband signals, the correlator FPGA is used for completing moving correlation operation on local pseudo codes and the received baseband signals, the two FPGAs are controlled by the DSP, and the pseudo codes and carrier signals are captured and tracked. According to the full-digital intermediate-frequency despreading demodulation receiver, multiple measures are taken to improve the system reliability, and the full-digital intermediate-frequency despreading demodulation receiver has the advantages of being high in sensitivity, flexible in structure, high in universality and insensitive to discreteness of device performance parameters and temperature time drifting characteristics.

Description

technical field [0001] The invention relates to a receiving device of electronic equipment, in particular to a highly reliable all-digital intermediate frequency despreading demodulation receiver and a method thereof. Background technique [0002] Spread spectrum communication has outstanding advantages in improving signal reception quality, anti-interference, confidentiality, and increasing system capacity, so it has been widely used in the field of data communication. In addition, some applications with complex electromagnetic environment and irradiation conditions (such as satellite communication and space communication) also put forward high requirements on system sensitivity, complexity and reliability. [0003] The demodulation and reception of the spread spectrum signal is the core of the spread spectrum communication system. The invention adopts the digital demodulation technology, which can effectively reduce the complexity of the receiver system, and has good sprea...

Claims

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Application Information

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IPC IPC(8): H04B1/708H04B1/16
Inventor石云墀
OwnerSHANGHAI SPACEFLIGHT INST OF TT&C & TELECOMM