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Survey of Encoding Techniques for Vehicle Multiplexing
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English
Abstract
This paper proposes the adaptation of a modulation technique called Modified Frequency Modulation (MFM) to vehicle multiplexing. MFM was developed during the latter 1960's for use in magnetic disk drives. Disk drives use MFM encoding to achieve a maximum density of recorded data on a disk. The advantage in vehicle multiplexing is that the technique is synchronous with an average of 0.75 transitions per bit. Another advantage is that it can tolerate a large amount of rise and fall time wave shaping, which can significantly reduce radiated EMI. The paper will compare the EMI characteristics generated by NRZ, PWM, VPWM, Manchester, and MFM encoding. Included are typical encoding requirements such as symbol generation, arbitration capabilities, latency, invalid bit testing as well as encoding techniques effect on the host microcomputer.
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Citation
Miesterfeld, F. and Halter, R., "Survey of Encoding Techniques for Vehicle Multiplexing," SAE Technical Paper 910715, 1991, https://doi.org/10.4271/910715.Also In
References
- SAE Vehicle Networks for Multiplexing and Data Communications Committee August 1987 “Collision Detection Serial Data Communication Multiplex Bus.” SAE J1567 Informaton Report
- SAE Vehicle Networks for Multiplexing and Data Communications Committee. July 1990 “Class B Data Communications Network Interface.” SAE J1850 Recommended Practice
- Serial Data Communication Road Vehicles Serial Data Communications for Automotive Application Part 2: “Vehicle Area Network (VAN)”
- SAE Vehicle Networks for Multiplexing and DataCommunications Committee “Selection of Transmission Media.” SAE J2056 Part 3 Information Report DRAFT
- Miesterfeld, F.O.R. Gaw, Scott H. September October 1990 “A J1850 Multiplexing Development Strategy: Part 1 and Part 2.” Automotive Engineering
- Ott, Henry W. “Noise Reduction Techniques in Electronic Systems.” Wiley-Interscience Publications, Bell Laboratories