How does the ISI depends on the carrier frequency symbol rate & moment of sender & receiver?
Symbol rate is peculiar only to PSK (Phase Shift Keying), QAM (that has Amplitude Shift Keying in addition to PSK to make the symbols) class of communications. It means instead of a single bit modulating the carrier in straight forward thinking, 2^k bits are combined into a ‘symbol’. In PSK, discrete phase values (placed at regular intervals of phase) are the symbols. If it is BPSK (Bi PSK) it is 2 phases (either 0 or 180 degrees, each represented by a bit). Quadrature PSK or QPSK has a menu of 4 phases (45, 135, 225 & 315 degrees), where two bits designate each symbol. 8PSK, 16PSK, . . . 256PSK are also in use. For analysing this the phase representing a particular symbol is (so all phases or symbols in a particular PSK system are) marked as point/s on what is known as Constellation diagram, that is ‘spinor representation’ in phase space. ISI (Intersymbol Interference) occurs because multiple path act as dispersive channel or inadequate channel frequency (impulse) response spreading t
