Method and device for low-swing difference signal bus transfer digital intermediate frequency

Abstract

An LVDS low swing difference signal bus digital intermediate frequency transmission method is provided. A front end intermediate frequency sampling processing unit consists of an AD chip, a DSP and a FPGA control chip group. The base-band processing is inside the FPGA. An LVDS difference transmission control unit consists of an LVDS driving chip and an FPGA control chip group. The data bidirectional transmission is realized through a controller consisting of the FPGA and the LVDS driving chips. The LVDS difference transmission control unit also comprises a signal processing board and a channel board. A parallel-serial transform sending module and a serial- parallel transform receiving module are arranged. The signal processing board and the channel board are connected through a balance transformation difference cable. When the information is received, the digital signals sampled from the analog intermediate frequency signals through a high-speed A / D are processed and then are exportedinto an FPGA buffer memory through an external bus. The data encoding framing, decoding frame and transforming control are accomplished in FPGA. The data are then exported to a signal processing board through an LVDS controller interface after going through the difference balance.

Description

1. Technical field [0001] The invention relates to a transmission and realization method and device of an anti-jamming digital intermediate frequency signal. 2. Background technology [0002] In modern communication systems, analog signals are usually used as the intermediate frequency, and radio frequency lines or discrete lines are used for signal transmission. With the rise of software radio stations and the development of high-speed anti-interference bus technology, it is particularly urgent to seek a new technology for transmitting intermediate frequency. [0003] At present, a large number of traditional digital signal transmission methods of radio frequency lines are used, which are increasingly unable to meet the digitization and anti-interference requirements of communication systems in terms of loss, anti-interference, external interference, and controllable speed. [0004] If common point-to-point physical layer interfaces such as RS-422, RS-485, SCSI and other d...

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Problems solved by technology

[0003] At present, a large number of traditional digital signal transmission methods of radio frequency lines are used, which are increasingly unable to meet the requirements of digitization and anti-interference of communication systems in terms of loss, anti-interference, external interference, and controllable speed.

[0004] If common point-to-point physical layer interfaces such as RS-422, RS-485, SCSI and other data transmission standards are used, due to their inherent limitations in speed, noise / EMI, power consumption, cost, etc., it is increasingly difficult to do the task

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