Link for ModelSim

Background on Manchester Encoding

Transmission of digital data frequently requires some form of modulation to overcome limits in a physical signal channel. One technique used for modulating digital data is Manchester Encoding. This technique has the following useful characteristics:

• The transmit clock signal can be easily extracted from the received data.

• The encoded signal never produces frequency components near DC, regardless of the data, which is useful for transmission over channels that require AC coupling.

• The encoding circuit is very simple and stateless.

On the negative side, Manchester Encoding requires substantial bandwidth (above the Shannon limit), which tends to limit its usefulness in wireless applications. However, for connected applications, such as short haul Optical fiber and Ethernet, it is frequently a good solution.

The following sections discuss

• The Encoding

• The Receiver

• Decoding with Inphase and Quadrature Convolution

MATLAB and ModelSim Manchester Receiver Tutorial

The Encoding