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Modems for dedicated wireless communications
- Apr 14, 2017 -

Railways, highways, aviation, such as traffic in the use of dedicated wireless communications, generally used only as a call, and the use of analog channels, but with the traffic operation and command automation implementation, also urgent demand for transmission of data, so how to simulate the wireless voice information transmission data, reduce BER, improve reliability, become a concern. One, the main function of the modem data signal is the binary "1" "0" signal, requiring the transmission of it, can accurately restore the original signal at the receiving end. The data signal represented by high, low level "1" and "0" contains a fairly wide spectrum from the start of the zero-frequency (DC), if directly in the bandwidth for 300~