Communication system for bi-phase transmission of data and having sinusoidal low pass frequency response

摘要

A data communication system for transmission of bi-phase signals modulated by data symbols and in which the signals are filtered in accordance with a frequency response which approximates zero at 0 Hz and at and exceeding the frequency 3/(2T) Hz and which has an approximately sinusoidal variation between those frequencies, T being the symbol interval. This filter characteristic minimizes intersymbol interference and improves the signal-to-noise ratio. The requisite filtering may be provided in the receiver or in part in the receiver and in part in the transmitter of the communication system.