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- adj. Between (adjacent) symbols
You must instead stimulate the channel with a PRBS (pseudorandom binary sequence) to shake out any data-dependent problems or ISI (intersymbol interference).
Effect of filtering at transmitter, channel, receiver symbol smearing or intersymbol interference (ISI)
Low symbol rate makes the use of a guard interval between symbols affordable, making it possible to handle time-spreading and eliminate intersymbol interference.