DESIGN OF FINITE IMPULSE-RESPONSE TRANSMITTER AND RECEIVER FILTERS FOR DATA COMMUNICATION-SYSTEM

Finite impulse response (FIR) transmitter and receiver filters for dat a transmission require both frequency domain and time domain approxima tion simultaneously. Previously, linear programming techniques have be en used to design such filters; however, those techniques require many calculations and lengthy computation time. Proposed here is the desig n method of FIR transmitter and receiver filters for data transmission that uses the successive projections method. The design method of a m atched filter pair is first described. It can have maximum signal-to-n oise ratio (SNR) when Gaussian noise exists on the transmission line a nd where both the transmitter and receiver filters have the same ampli tude response. Since the matched filter has double zeros in the stopba nd, it can also be used to derive the transfer function of a bandpass minimum phase filter. Then, the value of zero in the sampling interval is chosen such that total impulse response of the matched filter pair has zero intersymbol interference. A design method with constraint in time domain is thus described.