Sectionwise digital transmission for clearer inductive radio signalsFunded under: ECSC-COALRES 3C
Inductive radio, operating between 50-500kHz, is widely used in coal mining for voice and data communication but strong interference, in particular by equipment like converter-controlled drives, makes communication around those zones containing the equipment either insufficient or impossible. Passive measures normally used to counter interference cannot be used for underground inductive radio systems, so the project served for the development of a method of sectionwise digital, as opposed to analogue, voice and data transmission. This means that methods of error identification and correction can be applied, so that distorted information transmission can be corrected on the receiver side. A hardware solution has been developed which essentially comprises a coder/decoder unit with discrete elements, such as gates and fast registers. The system has been function tested, and the error identification and correction rate achieved corresponds to a Hamming distance of d=7 and allows identification and correction of 3 errors occurring simultaneously in the data flow. It is further intended to construct a coder/decoder unit incorporating a micro controller of the 8051-family.
Bibliographic Reference: EUR 17970 DE (1998) 107pp.
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Record Number: 199910005 / Last updated on: 1999-02-12
Original language: de
Available languages: de