PAM-M fault-tolerant transmission system and PAM-M fault-tolerant transmission method

Abstract

The invention provides a method for splitting data into N binary data, respectively performing error correction coding and scrambling operations, then performing binary direct-current balance coding,and finally synthesizing the N binary direct-current balance data subjected to error correction coding into M-ary direct-current balance data for data fault-tolerant transmission. The invention further provides a PAM-M fault-tolerant transmission system, forward data and reverse data are simultaneously transmitted on a cable, the forward data are subjected to M-ary direct-current balance encoding,the reverse data rate is lower than the forward data rate, the energy of the reverse data is in a low-frequency part of a frequency spectrum, and the energy of the forward data is in a high-frequencypart of the frequency spectrum. The beneficial effects of simplifying the circuit design and reducing the data error rate are achieved.

Description

technical field [0001] The invention relates to the technical field of data transmission, in particular to the technology of bidirectional fault-tolerant transmission through multi-ary PAM-M coding. Background technique [0002] With the rapid development of automatic driving and assisted driving technology, the demand for high-speed data transmission in vehicle electronic systems is increasing day by day. Wired transmission technology uses cables to transmit data. Compared with wireless transmission, wired transmission is faster and more stable. High security and thus gaining mass adoption. [0003] The main applications in vehicle data transmission are vehicle radar data, display video data and camera data. The image resolution of the display screen and the camera has undergone a stage of rapid development, and has been upgraded from standard definition and high definition (1080P) to ultra high definition (2K / 4K). The popularization has put forward higher requirements fo...

AI Technical Summary

Problems solved by technology

[0005] In the prior art, multi-ary PAM-M coding has been used for data transmission. Compared with NRZ coding, multi-ary coding represented by PAM-M coding (M=2 N , N is an integer and N>1) has the advantage of low cable bandwidth required, but the eye diagram amplitude of PAM-M is 9.6dB smaller than that of NRZ coding, and it is more sensitive to noise, signal distortion and circuit linearity

[0006] AC coupling is often used in long-distance transmission to eliminate the influence of the ground level voltage difference between the transmitting and receiving ends on the signal, but AC coupling cannot transmit the DC component in the signal. If there is a DC component in the signal, baseband drift will occur. Drift will reduce the signal-to-noise ratio and increase the bit error rate

[0007] For example, PAM-M coding is used in the existing 10Gbps automotive Ethernet technology, but the PAM-M coding used has a DC component, which will cause baseband drift after AC coupling, although a dedicated baseband can be used in the circuit Drift elimination circuit, but while increasing the cost and complexity, the baseband drift elimination circuit cannot completely eliminate the adverse effects of baseband drift, such as the reduction of signal-to-noise ratio and the increase of bit error rate.

Images