Packet data transmitter with symmetric ramping spectrum

摘要

Transmission is by data packets with heads and tails respectively associated with ascending and descending data packet transitions. Each packet is situated in a window centered on a transmission/reception frequency. The head and tail are composed of different value bit sequences so that the frequency spectrum associated with the transitions is centered on the transmission/reception frequency. The sequence of bits comprising the head and tail of the burst are periodic and composed of successive '01'. Alternatively they may be pseudo-random or changing between two successive bursts, in the latter case the bit sequence evolution composing the head and tail of two successive bursts is a translation of bit values. Alternatively the evolution sequence between two successive bursts is a circular permutation of bit values.