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Verilog Implementation of FM0/Manchester Encoder and Decoder For Dedicated Short-range Communication(DSRC)


Dedicated short-range communication (DSRC) is used for transferring data serially from one node to another node. DSRC standards generally use FM0 and Manchester encoder and decoder to reach dc-balance. Here the data is sent serially and then an encoder block, the data gets encoded, and then it will be transmitted in serially.

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Dedicated short-range communication (DSRC) is used for transferring data serially from one node to another node. DSRC standards generally use FM0 and Manchester encoder and decoder to reach dc-balance. Here the data is sent serially and then an encoder block, the data gets encoded, and then it will be transmitted in serially. Since most of the communication protocol uses serial communication we have decided to implement that project in Serial. In this protocol to get back, the original information user should know the operating frequency of the encoder.

Dedicated short-range communication (DSRC) is utilized for little and medium-range correspondence. The DSRC is arranged into two sorts: vehicle car and car to-roadside. In-vehicle to-car, the DSRC makes the data sending and broadcasting among cars for well-being purposes and open data declaration. The vehicle to roadside predominantly focuses on the wise transportation benefit, for example, the electronic toll gathering (ETC) framework. The ETC can be sent to the installment for stopping administration and gas-refueling. Consequently, the DSRC framework assumes an essential part of the present-day vehicle industry.

Manchester coding technique is a digital coding technique in which all the bits of the binary data are arranged in a particular sequence.  Here a bit  ‘1’  is represented by transmitting a high voltage for the half duration of the input signal and for the next halftime period an inverted signal will be sent.  When transmitting  ‘0’  in Manchester format, for the first half cycle a  low voltage will send, and for the next half-cycle, a high voltage is sent.

The advantage of Manchester coding is that, when sending data having continuous high signals or continuous low signal (e.g.:  11110000), it is difficult to calculate the number of 1 S and Os in the data. Because there is no transition from low to high or high to low for a particular time period (Here it is 4 x T, T is the time duration for a single pulse). The detection is possible only by calculating the time duration of the signal. But when we code this signal in Manchester format there will always be a transition from high to low or low to high for each bit.

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